Manuals+

Sonance 16-50 & 8-50 Multi-Channel Power Amplifier

Installation and Support Manual

Box Contents

Introduction

Thank you for selecting the Sonance 16-50 or 8-50 multi-channel amplifier. Sonance has over three decades of experience in premium distributed audio amplification. The amplifier has been precision engineered to provide maximum installation flexibility, low energy consumption and audiophile sound in a compact form factor (1RU). Please take the time to carefully read through the manual, study the illustrations and system diagrams. This extra time can lead to trouble-free operation and continued musical enjoyment.

Important Safety Instructions

You should always follow these basic safety precautions when using your Sonance Amplifier to reduce the risk of fire, electric shock, and injury to persons.

  1. Read and Retain Instructions: Read all the safety and operating instructions before operating the amplifier and retain them for future reference.
  2. Heed Warnings: Adhere to all warnings and precautions listed on the amplifier and in the operating instructions.
  3. Follow all operating instructions.
  4. Never use the amplifier next to water.
  5. Carts and Stands: Use only with a cart or stand that is recommended by the manufacturer. Move with care.
  6. Caution: To Prevent Electric Shock: Do not use the polarized plug with an extension cord, receptacle, or other outlets unless the blades can be fully inserted to prevent blade exposure.
  7. Ventilation: Situate the amplifier so that its location does not interfere with its proper ventilation.
  8. Heat: Situate the amplifier away from heat sources such as radiators, stoves, etc. (including amplifiers).
  9. Grounding or Polarization: Precautions that should be taken so that these attributes are not defeated.
  10. Power-Cord Protection: Route power supply cords so they will not be walked on or pinched by items.
  11. Cleaning: Use "canned air" or wipe the amplifier with a soft cloth. Do not use solvents, as they may damage the amplifier.
  12. Non-Use Periods: Unplug the amplifier's power cord from the outlet when the amplifier will be left unused for a long period of time.
  13. Object Entry: Care should be taken so that objects do not fall through the opening of the enclosure.
  14. Moisture: Do not expose the amplifier to dripping or splashing. Do not place objects filled with liquids, such as vases, on the amplifier.
  15. Damage Requiring Service: Have the amplifier serviced by a qualified service technician when the power cord or power supply is damaged, the amplifier has been dropped or the enclosure is damaged, something has spilled into the amplifier, it has been exposed to rain, or the amplifier is not operating properly.
  16. Servicing: Do not attempt to self-service the amplifier. Contact Sonance Tech Support for servicing options.
  17. Power Requirement: Do not connect the Sonance amplifier to the accessory outlet of any other component. Connection to a grounded mains power outlet is required.

Warning: The power (mains) plug serves as the amplifier's disconnect device. The disconnect device shall remain readily operable during operation. To ensure that the disconnect device is easily accessible, the user shall not place the amplifier in a confined area during operation.

Storms: To prevent damage to components, unplug all electronic equipment during thunderstorms.

Unplug by grasping the plug, do not pull on the cord.

Warning: Any changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Product Description

The Sonance 16-50 (16-channel power) and 8-50 (8-channel power) amplifiers are rated at 50W per channel into 8 Ohm loads, 100W per channel into 4 Ohm loads and 200W per bridged pair of channels into 8 Ohm loads. The internal stereo amplifier modules are audiophile grade, high-efficiency Class D. The amplifier is easily configurable for stereo and/or bridged operation and can pass paging and doorbell chimes when these signals are connected to the Bus Inputs. The amplifier is compatible with 4 Ohm speakers in stereo mode and 8 Ohm speakers in bridge mode. Bridged operation is useful for higher power output applications such as driving a passive subwoofer or an outdoor 8 Ohm satellite and subwoofer system. Audio source connections can be made into the 'Local' RCA inputs for individual use or into one of the Bus Inputs for distribution using the Zone Configuration Input Assignment DIP switches. Busing allows for a single source to be connected to one or more of the amplifier zones without the need for additional cabling. It is possible to turn multiple Zone Configuration Input Assignment DIP switches to ON to allow for multiple inputs to play together such as with use of paging or door bell chimes. The paging and door chimes will then be heard along with the audio source(s). The 16-50 and 8-50 has a comprehensive protection circuit that guards against shorted outputs, over-current, over-temperature, low AC voltage (brownouts) and excessive AC voltage.

Placement

The 16-50 and 8-50 features fan-assisted cooling utilizing vents on both sides of the chassis. Ensure the sides of the amplifier have a least 3" (75mm) of clearance to the sides of the rack or equipment cabinet to allow for proper air flow.

The amplifier should be placed in a dry, non-condensing environment with ventilation. Locate the amplifier so it is completely isolated from temperature extremes, rain, snow, direct sunlight and atmospheric contaminants. Do not locate the amplifier outdoors. Any moisture related damage such as from condensation is not covered by the factory warranty. Although the amplifier includes fan-assisted cooling, some heat is still produced. Locate the amplifier on a shelf or at the lowest place in a rack that has good circulation of fresh air to dissipate heat. Do not place the amplifier in a closed cabinet or closet with little ventilation as this can reduce its service life.

Quickstart Guide

The Quickstart Guide is intended for the installer who is familiar with the 16-50 or 8-50 and has reviewed the chapters on 'Important Safety Instructions' and 'Placement'.

Application One: Single Audio Source

Connect one analog audio source, such as a music streamer, into the Bus A inputs for internal distribution to all eight (16-50) or four (8-50) stereo Zone outputs.

Steps:

  1. Ensure the 16-50 or 8-50 is in the OFF state. The rear panel Power Switch should be in the down position.
  2. Decide on the appropriate Power Sensing Mode: Voltage, Audio Signals or the "always on" OFF position (such as for passing paging or doorbell chimes).
  3. Set the Sense DIP switch accordingly.
  4. If using the voltage trigger feature, connect a two-conductor wire from the 12 volt output of a zone preamp or DC power supply into the ‘V Trigger’ inputs on the amplifier.
  5. Connect a pair of RCA cables from the single source into the left and right Bus A inputs on the amplifier.
  6. Set the channel Input Assignment DIP switches to Bus A.
  7. Connect speaker wire from the speakers to their dedicated Speaker Output Block Connector.
  8. If the AC cord is disconnected, then reconnect it.
  9. Push the power switch up to the ON position.
  10. With the source volume turned down to a low, speaker-friendly level, activate the amplifier to play music. If you do not hear any sound, refer to the ‘No Audio’ section of the Troubleshooting chapter of this manual.
  11. Adjust volume output with Zone Level controls.
  12. Follow the steps in the chapter entitled, ‘Protecting Speakers from Damage’.

Application Two: Four Sources

Connect four analog audio sources, such as four music streamers or four line-level outputs of a multi-zone preamp into the local (direct) inputs.

Steps:

  1. Ensure the amplifier is in the OFF state. The rear panel power switch should be in the down position.
  2. Decide on the appropriate Power Sensing Mode: Voltage, Audio Signals or the ‘always on’ OFF position (such as for the passing paging or doorbell chimes).
  3. Set the Sense DIP switch accordingly.
  4. If using the voltage trigger feature, connect a two-conductor wire from the 12 volt output of a zone preamp or DC power supply into the ‘V Trigger’ inputs on the amplifier.
  5. Connect a pair of RCA cables from each stereo source into their dedicated local source inputs.
  6. Set the Input Assignment DIP switches to local. If paging or door chimes are not used, proceed to step 8.
  7. If providing doorbell chimes and/or paging into the amplifier, run a line-level cable from the door chime generator's audio output into the Bus A input. If also providing paging, run a line-level cable from the paging system's line-level output into the Bus B Input. Set all the Input Assignment DIP switches to ON. These connections and DIP switch settings will pass audio, door chimes and paging at all times.
  8. If using the Bus Input source along with a passive woofer/subwoofer (ex: VP85RW) in a zone, connect a single RCA cable from the SUB OUT on the amplifier to the amplifier driving the woofer. The audio output of the SUB OUT is low-pass filtered, so the amplifier driving the woofer does not have to perform this function. See section ‘Using The Subwoofer Line-Level Output Feature’.
  9. Connect 14/4 speaker wire from the remote zones to their dedicated Speaker Output Block Connectors. For example, if the audio source for the kitchen is connected into channels one Left and one Right RCA inputs, then connect the 14/4 speaker wire from the kitchen speakers into the Speaker Block Connector plugged into the first amp pair.
  10. If the AC cord is disconnected, then reconnect it.
  11. Push the power rocker switch up to the ON position.
  12. With the source volume turned down to a low, speaker-friendly level, turn on the amplifier and play music. If you do not hear any sound, refer to the ‘No Audio’ section of the troubleshooting chapter.
  13. Follow the steps in the chapter entitled, ‘Protecting Speakers from Becoming Damaged’.

Unpacking and Record Keeping

Save the box and its interior packing material in a dry, protected space. The box and packing are vitally important to protect the amplifier should it need to be transported for service or relocation in the future.

The information below is critically important for warranty claims, advanced troubleshooting, parts inquiries and insurance replacement. The amplifier’s serial number is located on a label on the back panel below a bar code. In addition, please keep a copy of your dealer’s sales invoice listing the amplifier with the serial number in a secure place. These are crucial time-saving steps for the future, if a warranty claim becomes necessary.

S/N: ___________________________________________

DATE OF SALE:__________________________________

DEALER NAME:_________________________________

CONTACT INFO:_________________________________

Stacking Multiple Amplifiers

Multiple amplifiers can be directly stacked with the feet removed for use in low to moderate output applications. For high output applications, provide at least 1U space (1.75"/44.4mm) between amplifiers for increased ventilation.

Operating the Amplifier

The 16-50 and 8-50 were designed to be ultra-simple to operate once installed. When the ‘Sense’ mode is set to ‘Voltage’ and a 3-30V DC voltage is applied, the unit will produce sound after approximately one second. When 3-30V DC is removed, the amplifier will enter a low power standby state after ten seconds. When the ‘Sense’ mode is set to ‘Audio’ and an audio input above 1.5mV is detected, the unit will produce sound after approximately one second. When the audio signal is removed, the amplifier will wait 15 minutes and then enter a low power draw state. This ensures that if the music is paused or has a quiet period for a short time, the amp will produce sound immediately.

Recommended Cable and Wire

Recommended Installation Tools

Front and Rear Panel Features

Front Panel

Rear Panel

Trigger Mode Control

Amplifiers can be set to automatically turn ON when receiving an audio signal, a control voltage, or to remain on continuously.

Note: If Audio or Voltage triggers are selected, the amplifier has a less than one-second cycle time from standby to play an audio signal. This is normal and required to comply with the EU <0.5 Watt ERP directive. Select OFF to bypass this feature.

Auto On Triggering - Three Position Switch

12V Trigger Output

The amplifier provides a 12V DC output via a two-wire screw connector, active whenever the amplifier is ON. Do not exceed 100mA current draw.

Line Inputs/Loop Outputs

The amplifiers feature BUS IN and THRU connections, and zone-specific IN connections. Zone-specific IN connections are typically used with a multi-zone preamp for zone exclusivity.

BUS A and BUS B

These inputs allow sharing of audio sources internally with multiple zones. BUS inputs are useful for blending auxiliary sources like paging announcements and door chimes with the primary audio source connected to local inputs. Paging and doorbell chimes will be heard along with the audio source; they will not mute the local audio.

Connecting Audio Inputs

There are three options for connecting audio inputs:

  1. Zone Line In Connectors: Use local inputs to dedicate one audio source to its corresponding zone speaker outputs.
  2. Bus A Input: Use Bus A input to pass an additional audio source, such as paging, to any amplifier zone via rear panel DIP switches.
  3. Bus B Input: Use Bus B input to pass an additional audio source, such as door chimes, to any amplifier zone via rear panel DIP switches.

BUS THRU Outputs

Each Bus Input provides non-buffered loop outputs allowing multiple amplifiers to share common audio sources. The number of amplifiers that can be connected in series depends on the audio source's output capability. The source connected to the LEFT and RIGHT IN passes through to the LEFT and RIGHT THRU Outputs. Always use high-quality, shielded interconnect cables.

BUS A SUB Out

BUS A has a subwoofer output connection that sums the signal from the LEFT and RIGHT IN connections. The X-OVER switch (80Hz or 120Hz) applies a low-pass filter to the SUB OUT signal. A matching high-pass filter is applied to BUS A signals routed to amplifier zones via the rear-panel DIP switches. BUS A THRU signals are unaffected.

The 80Hz setting is suitable for most subwoofer applications with large/medium main speakers. The 120Hz setting is typically used with smaller main speakers or when more bass is required in a larger room.

Connect a stereo line-level source with an RCA cable into the BUS A Left and Right IN. Connect a single RCA cable from the SUB OUT jack to the line-level input on a powered subwoofer.

If using a separate power amplifier, connect the SUB OUT jack to the input specified in that amplifier's manual. If a zone is used in bridged mode (8 ohms minimum), use the Zone IN connection labelled "BRIDGE".

Input DIP Switch Assignments

DIP switches enable one or more audio sources to be played through one or more speaker outputs simultaneously. Channels can be set to local (direct) source, Bus A, and/or Bus B signals. Turning a DIP switch to ‘ON’ plays the source through the assigned speaker output.

Example: For a two-zone setup, connect one source to Bus A and a second to Bus B. Set one half of the DIP switches to Bus A and the other half to Bus B. For a control system example, all input connections can be local for a discrete four-zone system, with Bus A switched ‘ON’ for doorbell monitoring and Bus B ON for paging duties. Zone output depends on connected sources and DIP switch settings.

Zone Trim Controls

Each zone has a rear-panel volume adjustment (TRIM control). The minimum gain setting (fully counter-clockwise) does not mute the output. The adjustment range is +15 to +30dB. The trim control is intended to be set below the point of distortion for the amplifier and speakers, preventing speaker damage. These controls also allow balancing of sound levels between zones or between left/right channels to compensate for room characteristics or seating arrangements.

Important: Do not combine negative terminals. The amp is not common ground type architecture.

Amplifier Power Requirements

A table detailing power requirements for the 8-50 and 16-50 models, including input power, output power (sinewave), and recommended breaker sizes for different quantities of amplifiers.

ModelInput PowerOutput Power (sinewave)Input Power15 AMP Breaker20 AMP Breaker
Max Power All Channels (8 or 4 ohm)1/8 Power All Channels@ Idle@ StandbyQty of Amplifiers (120VAC)Qty of Amplifiers (120VAC)
8-50100-120VAC600W
<200W
30W
<0.5W		3 (120VAC)4 (120VAC)
8-50220-240VAC600W
<200W
30W
<0.5W		6 (230VAC)8 (230VAC)
16-50100-120VAC600W
<200W
50W
<0.5W		3 (120VAC)4 (120VAC)
16-50220-240VAC600W
<200W
50W
<0.5W		6 (230VAC)8 (230VAC)

Note: Amplifiers do not support matrix volume control. Relative source levels between zones and zone/bus inputs must be set at the signal source.

Important: Use caution when setting volume levels either on the amplifier or an audio switcher to avoid overdriving and possibly damaging speakers. Verify all sources as output voltage varies from device to device.

Speaker Connections

Removable Speaker Block Connectors accept up to 12-gauge wire. Ensure no bare wires contact the amplifier chassis. These connectors have four terminals actuated by small flat head screws, usable for normal stereo or bridged mode.

Note: Always check local building codes before installing wire in walls or ceilings.

Bridging Channels

Important: The minimum speaker impedance for bridged operation is 8 Ohms. Do not connect speakers rated at less than 8 Ohms in bridged mode. The amplifier can run hot, may go into protection, and have a reduced lifespan.

Bridge Mode/Bridging

Bridging an adjacent pair of amplifier channels inverts the phase to the right channel and drives the left and right channels together in series to generate higher output. Bridging can produce up to twice the driving voltage and four times the power, advantageous for driving passive woofers or 8 Ohm outdoor satellite/subwoofer systems. This sacrifices some amplifier channels, and speaker impedance must be 8 Ohms or above.

For bridging, use the left Local Input or the left Bus Input. Use the DIP switch to select the input for the bridged output.

  1. Set the zone’s Bridge switch to the ON position.
  2. Connect the speaker’s “+” lead to the left side of the connector marked “+” (first speaker lead from the left).
  3. Connect the speaker’s “–” lead to the right side of the connector marked “-” (third speaker lead position from the left).

Protection Circuitry and LEDs

Sonance amplifiers feature a multi-stage protection system to prevent damage to the amplifier and speakers.

Amplifier Channel Protection

If a channel encounters a short circuit or extremely low impedance, its outputs will automatically mute. The affected channel's output remains muted until the fault is corrected. Only the affected channels mute; others operate normally.

Amplifier Channel Protection Indication

Front panel multi-color indicators show the current operating status of each amplifier zone.

Important: Do not exceed 100mA of current draw. Damage can occur.

Important: Allowing the amplifier to operate with one or more channels in protect mode for an extended time can damage the amplifier.

Amplifier Over Temperature Protection

The amplifier also has protection for the power supply. If the power supply heat sink temperature exceeds the design maximum, the protection circuit will activate, disconnecting all channel outputs. This is indicated by a flashing red power status indicator.

Important: Any time the protection circuits are triggered, unplug the amplifier's power cord from the wall outlet before troubleshooting.

Protecting Speakers from Damage

To prevent speakers from being ‘blown’ by overdriving the amplifier, Sonance recommends setting a safe, maximum volume limit for each channel pair. This is achieved by reducing the output volume controls on the rear panel. The Sonance speaker warranty does not cover blown, user-damaged speakers; it covers manufacturing defects.

It is imperative to adjust output level controls before playing speakers to protect them:

  1. Select challenging music selections that test speaker dynamics, with substantial bass impact from synthesizers, bass guitars, and drums. Use uncompressed, high-resolution music, not MP3s.
  2. Reduce all zone output volume level controls on the amplifier to minimum.
  3. Turn the zone preamp or a source with variable output volume up to the maximum level.
  4. Play the first music selection.
  5. Slowly increase the Output Volume Level of the first amplifier pair, stopping when even the slightest distortion or stress is detected.
  6. Decrease the volume slightly below this point.
  7. Play other challenging tracks, ensuring zero distortion. If distortion is heard, decrease the volume setting just below that point.
  8. Once the maximum volume is found, leave the controls at these settings. Advise others that increasing controls beyond these settings can damage speakers and void their warranty.

There is a limit to how loud an audio system can play before distortion occurs. If this point is noted and not exceeded, most Sonance speakers and amplifiers will operate safely for years.

Amplifier Stacking

The amplifier can be directly stacked with feet removed for low to moderate output applications. For high-output applications, leave at least 1U space (1.75"/44.4mm) between amplifiers for increased ventilation.

Shelf Mounting

If shelf mounting, attach the four included feet by screwing them into the threaded openings; no tool is required.

Equipment Rack Mounting

The amplifier ships with two short rack ears (left and right) that attach to its sides. Unscrew the two Phillips head screws found on each side of the left and right forward section of the amplifier. Use these screws to connect the included rack ears. Rack ears are unnecessary for shelf mounting.

Rack Ear Configuration Options

The amplifier chassis has threaded inserts on the sides for mounting ears in designated locations:

System Examples

Installation Steps With A Single Audio Source

  1. Once mounted in a rack or on a sturdy shelf, ensure it is in the OFF state. The rear panel power switch should be in the down position.
  2. Decide on the appropriate Power Sensing Mode: voltage, audio signals, or the 'always on' Off position (for paging or doorbell chimes).
  3. Set the Sense DIP switch accordingly.
  4. If using the voltage trigger feature, connect a two-conductor wire from the 12 volt output of a zone preamp or DC power supply into the ‘V Trigger’ inputs.
  5. Connect a pair of RCA cables from the single source into the Left and Right Audio Inputs for Bus A.
  6. Set the Input Assignment DIP switches to the Bus A inputs, alternating between left channel and right channels.
  7. If using Bus Inputs with a passive woofer/subwoofer (e.g., VP85RW) in a zone, connect a single RCA cable from the SUB OUT on the amplifier to the amplifier driving the woofer. The SUB OUT's audio output is low-pass filtered, so the amplifier driving the woofer does not need to perform this function. Refer to the section 'Using The Subwoofer Line-Level Output Feature'.
  8. Connect 14/4 speaker wire from the remote zones to their dedicated Speaker Output Block Connector on the amplifier.
  9. If the AC cord is disconnected, then reconnect it.
  10. Push the power rocker switch up to the ON position.
  11. With the source volume turned down to a low, speaker-friendly level, turn on the amplifier and play music. If no sound is heard, refer to the 'No Audio' section of the troubleshooting chapter.
  12. Follow the steps in the chapter entitled, ‘Protecting Speakers from Becoming Damaged’.

Installation Steps With Four Sources

  1. After mounting in a rack or on a sturdy shelf, ensure it is in the OFF state. The rear panel power switch should be in the down position.
  2. Decide on the appropriate Power Sensing Mode: voltage, audio signals, or the always on 'OFF' position.
  3. Set the Sense DIP switch accordingly.
  4. If using the voltage trigger feature, connect a two-conductor wire from the 12 volt output of a zone preamp or DC power supply into the 'V Trigger' inputs.
  5. Connect a pair of RCA cables from each stereo source into their dedicated local source inputs.
  6. Set the Input Assignment DIP switches to local. If paging or door chimes are not used, proceed to step 8.
  7. If providing doorbell chimes and/or paging into the amplifier, run a line-level cable from the door chime generator's audio output into the Bus A input. If also providing paging, run a line-level cable from the paging system's line-level output into the Bus B Input. Set all Input Assignment DIP switches to ON. These connections and DIP switch settings will pass audio, door chimes, and paging at all times.
  8. If using the Bus Input source with a passive woofer/subwoofer (e.g., VP85RW) in a zone, connect a single RCA cable from the SUB OUT on the amplifier to the amplifier driving the woofer. The SUB OUT's audio output is low-pass filtered, so the amplifier driving the woofer does not have to perform this work. See section ‘Using The Subwoofer Line-Level Output Feature’.
  9. Connect 14/4 speaker wire from the remote zones to their dedicated Speaker Output Block Connectors. For example, if the audio source for the kitchen is connected into channels one Left and one Right RCA inputs, then connect the 14/4 speaker wire from the kitchen speakers into the Speaker Block Connector plugged into the first amp pair.
  10. If the AC cord is disconnected, then reconnect it.
  11. Push the power rocker switch up to the ON position.
  12. With the source volume turned down to a low, speaker-friendly level, turn on the amplifier and play music. If no sound is heard, refer to the 'No Audio' section of the troubleshooting chapter.
  13. Follow the steps in the chapter entitled, ‘Protecting Speakers from Becoming Damaged’.

Troubleshooting

Recommended Troubleshooting Tools

Multimeter Test for Open and Shorted Wire and Speakers

Measurements are taken across the two-conductor speaker wires leading to a speaker. The two wires and the speaker comprise a circuit. Connecting a multimeter completes the circuit. For four-conductor wire, test one set of wires and its speaker at a time.

Please Note: A speaker with a switchable high-pass filter in the crossover (e.g., AS38R/S or VP38R/S) will need the switch in the OFF position to take a DCR reading. Otherwise, the capacitor in the high-pass filter will block DC, and the load will show 'OPEN'. Remember to set the high-pass filter switch back to ON after taking the DCR reading.

  1. Turn off the amplifier before connecting or disconnecting any cabling.
  2. Disconnect the speaker wires from the Speaker Block Connector.
  3. Set multimeter to measure DC. Apply meter probes across the two-conductor speaker wire for one of the channels not producing sound. Use the red probe for the “+” wire and the black probe for the “–” wire. This tests the wiring and the connected speaker.
  4. If the meter reads ‘INFINITE’ or very high resistance, the circuit is open. No continuity exists between the speaker wires and the speaker. This could be due to an open wire, a disconnected speaker, or a severely compromised speaker (open/blown voice coil).
  5. If the DC measurement is zero or close to zero, the circuit (wire and speaker) has become shorted. This could be from a staple shorting speaker wires, or speakers severely damaged by excessive power or over-excursion.
  6. If the DC measurement is between 6-8 Ohms (for a single 8 Ohm speaker), the circuit has continuity, and the problem is internal.
  7. A speaker can also be tested directly for continuity. If installed in a ceiling or wall, remove it. Apply meter probes directly across the “+” and “–” input terminals of the speaker. Most 8 Ohm speakers measure between 5-7 Ohms of DC resistance. If the measurement is close to zero (shorted) or infinite (open), the speaker needs replacement.

Troubleshooting: No Power

Potential Reasons:

The 16-50 and 8-50 ship with the Power Sense switch set to OFF. When plugged into a live AC outlet and the rear panel power switch is depressed, the front panel power status 'A' indicator should illuminate.

Steps to Resolve: If the front panel 'A' power status indicator does not illuminate:

  1. Double-check that the amp's AC power rocker switch is in the up (ON) position.
  2. Ensure the detachable AC cord connector is fully inserted into the back panel IEC power receptacle.
  3. Check if the AC cord's male plug is plugged into a live working AC outlet. If necessary, plug another appliance (like a lamp) into the same AC outlet. If the lamp does not light, the AC outlet's circuit breaker or GFCI circuit may need resetting, or the outlet needs evaluation.
  4. Remove the amp and take it to another location in the residence. Plug it into a different, known working AC outlet.
  5. Try a second IEC AC power cord.
  6. If the amplifier's display 'A' letter still does not illuminate, contact the Sonance dealer or Sonance Technical Support at technicalsupport@sonance.com.

Troubleshooting: No Audio

Applicable to one or both paired channels (e.g., 16-50's or 8-50's 1L and 1R inputs). A 'source' is defined as the audio component providing line-level audio (e.g., AV receiver, multi-zone controller, music server, tuner, iPhone).

Potential Reasons:

If an amplifier does not provide audio output and protection LEDs are not illuminated, proceed to step 1. If protection LEDs are illuminated, proceed to step 6.

Important: Before disconnecting or reconnecting audio cables or speaker connections, turn the amplifier OFF. Once connections are remade, turn the amp back ON. Making or breaking line-level RCA connections with the amplifier powered ON can damage the amplifier and/or speakers.

Steps to Resolve:

  1. Check the line-level RCA interconnect cable and its connections from the source to the amplifier. Ensure RCA plugs are fully inserted. If the cable is 'open' (bad connector or cable), replacing it should restore functionality. Use a new cable or temporarily use a cable from another zone. If still no sound, proceed to step 2.
  2. Try the output of another source into the non-functioning amplifier. For example, use zone 3 output or variable output from a music server, portable music player, or satellite tuner.
  3. Examine speaker wires inserted into the Speaker Block Connector. Ensure wires are securely inserted, not loose, and no strands are touching. Re-secure suspect wires, plug the connector back in, turn the amp on, and check for output. If still no output, proceed to the next step.
  4. Unplug the Speaker Block Connector. Disconnect current speaker wires. Using a short run of speaker wire, connect a local test speaker into the block connector. Plug the block connector back into the amp, turn the amp on, and test for audio output. If the test speaker produces audio, there might be an 'open circuit' at the remote zone speakers or a compromised connection. Alternatively, disconnect the Speaker Block Connector from a known working zone and plug it into the non-working zone. If the amplifier now produces sound, the wiring between the amp and speakers may be compromised. If not, the non-functioning amplifier may have an internal fault not indicated by protection LEDs. Contact Sonance Technical Support for RMA.
  5. Check the position of the source select switch.
  6. If front panel zone LEDs are illuminated red, disconnect the Speaker Output Block Connector. If protection LEDs remain on with the connector unplugged, the amplifier may have an internal fault (no reset procedure). Return to Sonance via RMA. If LEDs go out when unplugged, try step 4 again. If functioning properly, there could be a short in speaker wires or speakers damaged from excessive power.

Troubleshooting: No Bass and 'Hollow-Sounding' Voices

Potential Reasons:

Steps to Resolve:

  1. Turn off the amplifier before connecting or disconnecting any cabling.
  2. Check speaker wire polarity at the amplifier and speakers. Reverse if necessary.
  3. Turn the amplifier back on and play speakers. If bass is better and voices sound centered, the polarity problem is solved.
  4. If wiring looks correct at the amplifier, polarity reversal may be at the speaker location. If speakers are inaccessible, reversing polarity at the amplifier is an option.
  5. If polarity is not the issue, ensure line-level input signals are full-range and not filtered at the source. Connect a local full-range source to the suspect amplifier pair inputs.
  6. With a second, known working source, do speakers have full-range sound? If yes, investigate the preamp supplying the audio signal.
  7. If speakers still lack bass, connect a different, properly working pair of test speakers. If test speakers have good bass, the zone speakers need testing and potential replacement.

Low Audio Volume

Potential Reasons:

Steps to Resolve:

  1. Determine the source's voltage output rating. If it's below the amplifier's input sensitivity rating, a preamp may be needed.
  2. Check the source's volume control (if applicable). Increase if variable.
  3. Check the amplifier's back panel volume controls. Turn them up, but below the point of distortion. These controls protect speakers from overdriving.

Troubleshooting: Distortion

Potential Reasons:

Steps to Resolve:

  1. Turn off the amplifier before connecting or disconnecting any cabling.
  2. Check Speaker Block Connectors for shorts (adjacent wires touching, staples). Ensure wires are correctly and securely inserted. Make sure speaker impedance is 4 Ohms and above for each channel.
  3. Substitute another, known working RCA cable between the source and inputs.
  4. Substitute a different, known working source component, especially one with variable volume. If the second source lacks variable volume, reduce amp volume controls to prevent speaker overdrive before playing.
  5. Test speakers with a different, distortion-free amplifier or pair of channels. If distortion remains, speakers are likely damaged and need replacement. Review 'Protecting Speakers From Becoming Blown/Distorted' before playing replacements.
  6. Disconnect the Speaker Block Connector, loosen screws, remove speaker wires, and substitute a test speaker and two-conductor wire. Plug the block connector back in, turn the amplifier on. If the test speaker has no distortion, the problem is in the wiring to the zone or in the zone speakers.
  7. If Speaker Block Connector connections are correct, RCA cables work, source is not distorted, but the local test speaker is distorted, an internal fault has occurred in the amplifier.

Troubleshooting: Hum

Hum is defined as a constant 50Hz or 60Hz tone and its related low harmonics (buzz).

Potential Reasons:

Steps to Resolve:

  1. Turn off the amplifier before connecting or disconnecting any cabling.
  2. Temporarily reduce the audio system to a minimum. If connected to an AV receiver, cable box, or satellite receiver, turn off the receiver and disconnect line-level inputs.
  3. With line-level inputs disconnected, is hum still audible? If yes, and the amplifier is in a metal rack, uninstall it and place it on the floor. With inputs disconnected and not physically grounded to the rack, the hum should disappear. If not, there may be an internal amp fault.
  4. Connect a mobile audio device using its headphone output with a 'stereo mini to two RCA male adaptor cable' into the amplifier channels with hum. A phone with stored music is ideal as it's not connected to the local AC ground. A CD, music streamer, or other audio source with a two-prong AC plug can also be used.
  5. Turn the amplifier back on, play music at typical volume, then pause. If hum is gone, it's likely a system ground loop. Use a ground loop isolator with RCA inputs and outputs to eliminate hum.
  6. If hum persists, temporarily use an AC 'cheater' plug (three to two AC adaptor) to lift the AC ground from the amplifier. Do not leave this adaptor in place permanently. If this solves the problem, consider using an AC hum eliminator/lifter on the component introducing the hum.
  7. If in-ceiling speakers are close to low voltage lighting transformers, move speakers, move transformers away, or move speaker crossovers. Crossover inductors can pick up transformer hum.

Troubleshooting: Noise

Noise is defined as any undesirable sound added to the input signal, excluding hum or its harmonics. Refer to the Hum troubleshooting section.

Potential Reasons:

Steps to Resolve:

  1. Turn off the amplifier before connecting or disconnecting any cabling.
  2. Connect a different, low-noise audio source into the amplifier channels with the noise. If noise disappears, the source has the noise, not the amplifier.
  3. If noise remains, ensure RCA cables are good quality, not crimped or kinked, and properly shielded.
  4. Connect speakers from a different zone that does not have noise. Pull out the Speaker Block Connector from suspect channels, do the same with another zone, and plug known working speakers into this zone. If noise disappears, suspect zone speakers may be damaged and need replacement.
  5. Replace damaged speaker(s) and set volume controls on the back panel below the point of amplifier distortion or speaker overdrive. Review 'Protecting Speakers From Becoming Blown/Distorted'.
  6. If noise is heard only from one zone or channel, connect a known working, problem-free source to this zone. Turn the amplifier on and listen for noise. If noise disappears, the problem is with the source. If noise remains, connect a test speaker to the channel(s). If noise disappears with the test speaker, the problem may be in the zone's speaker or wire connections. If noise remains after all troubleshooting steps, the problem lies within the amplifier.

Troubleshooting: Front Panel Protection LEDs Are Illuminated

Potential Reasons:

Steps to Resolve:

  1. Ensure the amplifier is on a shelf or at the lowest place in a rack with good air circulation to dissipate heat. Do not locate in a closed cabinet or closet with little ventilation, as this can trigger thermal protection and reduce service life.
  2. Disconnect the Speaker Block Connector from the pair of amp channels in protection. If protection LEDs go out, the short is external. If LEDs remain on, it could be caused by DC on RCA inputs or an internal amplifier problem. Substitute a different source for channels not in protection. If protection LEDs go out and substitute speakers have sound, the problem is with the source (e.g., DC), not the amplifier.
  3. Check speaker wire for shorts, adjacent wires touching, or construction staples. Examine wire connections in the Speaker Block Connector. Substitute a different Speaker Block Connector. Connect speakers from a working zone. If protection LEDs go out and speakers have sound, there is a short with the original wire/speakers.
  4. If two pairs of speakers are connected to amplifier channels, ensure both pairs are rated at 8 Ohm. Lower impedance speakers may trigger protection. Use an impedance matching device, connect additional speakers to available amp channels, or purchase an additional amplifier.

Uninstalling the Amplifier for Relocation or Service

  1. Turn the amplifier off using the power switch on the back.
  2. Pull out the removable AC Power Plug from the AC socket on the back.
  3. Disconnect all RCA line-level cable inputs on the back.
  4. If removal is temporary, unplug the Speaker Block Connector, leaving wiring in place. If permanent, use a small flat head screwdriver to loosen speaker wire securing screws on the Speaker Block Connector and remove speaker wires.
  5. If relocation is permanent, re-insert the Speaker Block Connector into the speaker outputs on the back of the amplifier.
  6. If the unit is rack mounted, remove rack mount screws from the front, supporting the amplifier's weight.
  7. Store rack mount screws and hardware in a resealable plastic bag, labeled 'Sonance 16-50 or 8-50 rack mounting hardware', in a known place.
  8. Remove the amplifier from the rack and repack it in its original factory carton for safe transport.

Technical Specifications

Sonance 16-50 Technical Specifications

Number of Channels16 (8 stereo zones)
Power Output - 8 Ohms50 watts RMS per channel (all channels driven)
Power Output - 4 Ohms100 watts RMS per channel (all channels driven)
Power Output - 8 Ohms (Bridged)200 watts
Frequency Response10Hz - 22kHz (+/-1dB)
Signal to Noise Ratio>100 dB A-wtd
CrosstalkBetter than -80 dB, typical, 1kHz
Voltage Trigger Input3-30Vdc
Audio Sense Threshold1.5 mVrms
Crossover FilterOFF/80Hz/120Hz
AC Mains Voltage100-240V~/50-60Hz
Rack Space Requirement1U - Full Width
Dimensions w/Feet (WxHxD)17.2" x 2.2" x 12.3" (436mm x 55mm x 312.5mm)
Dimensions w/Rack Ears no Feet (WxHxD)19" x 1.75" x 12.3" (482mm x 44mm x 312.5mm)
Shipping Weight13.4 lbs (6.1kg)

Sonance 8-50 Technical Specifications

Number of Channels8 (4 stereo zones)
Power Output - 8 Ohms50 watts RMS per channel (all channels driven)
Power Output - 4 Ohms100 watts RMS per channel (all channels driven)
Power Output - 8 Ohms (Bridged)200 watts
Frequency Response10Hz - 22kHz, bandwidth limited
Signal to Noise Ratio>100 dB A-wtd
CrosstalkBetter than -80 dB, typical, 1kHz
Voltage Trigger Input3-30Vdc
Audio Sense Threshold1.5 mVrms
Crossover FilterOFF/80Hz/120Hz
AC Mains Voltage100-240V~/50-60Hz
Rack Space Requirement1U - Full Width
Dimensions w/Feet (WxHxD)17.2" x 2.2" x 12.3" (436mm x 55mm x 312.5mm)
Dimensions w/Rack Ears no Feet (WxHxD)19" x 1.75" x 12.3" (482mm x 44mm x 312.5mm)
Shipping Weight12.7 lbs (5.8kg)

Replacement Accessory Parts

International SKUs do not include an AC Cord. Contact Sonance Customer Service to order parts: customerservice@sonance.com

Limited Two (2) Year Warranty

Sonance warrants to the first end-user purchaser that this Sonance-brand product (Sonance 16-50 or 8-50) when purchased from an authorized Sonance Dealer/Distributor, will be free from defective workmanship and materials for the period stated below. Sonance will at its option and expense during the warranty period, either repair the defect or replace the Product with a new or remanufactured Product or a reasonable equivalent.

Exclusions: To the extent permitted by law, the warranty set forth above is in lieu of, and exclusive of, all other warranties, express or implied, and is the sole and exclusive warranty provided by Sonance. All other express and implied warranties, including the implied warranties of merchantability, implied warranty of fitness for use, and implied warranty of fitness for a particular purpose are specifically excluded.

No one is authorized to make or modify any warranties on behalf of Sonance. The warranty stated above is the sole and exclusive remedy and Sonance's performance shall constitute full and final satisfaction of all obligations, liabilities and claims with respect to the Product.

In any event, Sonance shall not be liable for consequential, incidental, economic, property, bodily injury, or personal injury damages arising from the Product, any breach of this warranty or otherwise.

This warranty statement gives you specific legal rights, and you may have other rights which vary from state to state. Some states do not allow the exclusion of implied warranties or limitations of remedies, so the above exclusions and limitations may not apply. If your state does not allow disclaimer of implied warranties, the duration of such implied warranties is limited to period of Sonance's express warranty.

Your Product Model and Description: Sonance 16-50 or 8-50 Multi-Channel Power Amplifier.

Warranty Period for this Product: Two (2) years from the date on the original sales receipt or invoice or other satisfactory proof of purchase.

Additional Limitations and Exclusions from Warranty Coverage: The warranty described above is non-transferable, applies only to the initial installation of the Product, does not include installation of any repaired or replaced Product, does not include damage to allied or associated equipment which may result for any reason from use with this Product, and does not include labor or parts caused by accident, disaster, negligence, improper installation, misuse (e.g. overdriving the amplifier or speaker, excessive heat, cold or humidity), or from service or repair which has not been authorized by Sonance.

Obtaining Authorized Service: To qualify for the warranty, you must contact your authorized Sonance Dealer/Installer or call Sonance Customer Service at (949) 492-7777 within the warranty period, must obtain a return merchandise number (RMA), and must deliver the Product to Sonance shipping prepaid during the warranty period, together with the original sales receipt, or invoice or other satisfactory proof of purchase.

Warranty Process: Please follow the troubleshooting instructions in this manual or work with your Sonance dealer to determine the exact nature of the fault. Sonance provides a 2-Year Limited Warranty to the original owner with proof of purchase from an authorized Sonance dealer. The warranty does not cover shipping charges back to Sonance or the use of the product in an environment or application not approved by Sonance.

In order to initiate a warranty claim:

  1. Contact Sonance Technical Support with a description of the fault, the amplifier's serial number and the date of purchase from an authorized Sonance dealer at: technicalsupport@sonance.com
  2. Sonance Technical Support will follow-up and may request additional troubleshooting.
  3. Once a determination has been made on the fault, Sonance Customer Service will follow-up by email. Please have a scanned copy of your 8-50 or 16-50 sales invoice ready to send upon request to document the amplifier's warranty status.
  4. Sonance Customer Service will provide an RMA number to be included on the shipping label of the packaging. Please send the amplifier back in its original factory carton, which has been specifically designed to protect the amplifier during transit.

Contact us at: https://www.sonance.com/company/contact

©2022 Sonance. All rights reserved. Sonance is a registered trademark of Dana Innovations. Due to continuous product improvement, all features and specifications are subject to change without notice. For the latest Sonance product specification information visit our website: www.sonance.com

SONANCE • 991 Calle Amanecer • San Clemente, CA 92673 USA

PHONE: (949) 492-7777 • FAX: (949) 361-5151 • Technical Support: (949) 492-7777

12.13.2022

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