Sonance UA 2-125 | UA 2-125 ARC 2-Channel DSP Power Amplifier Installation and Support Manual

Introduction

Thank you for selecting a Sonance UA 2-125 or UA 2-125 ARC amplifier. Sonance has over four decades of experience in premium distributed audio amplification. This amplifier has been precision engineered to provide maximum installation flexibility, low energy consumption, and audiophile sound in a compact form factor. 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.

READ THIS SECTION IN ITS ENTIRETY BEFORE ATTEMPTING USE OF THIS AMPLIFIER.

Important Safety Instructions

Always follow these basic safety precautions when using your amplifier to reduce the risk of fire, electric shock, and injury to people or objects.

  1. Read all the safety and operating instructions before operating the amplifier and retain them for future reference.
  2. 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. Keep amplifier dry at all times.
  6. Ventilation: situate the amplifier so that its location does not interfere with its proper ventilation.
  7. Heat: situate the amplifier away from heat sources such as radiators, stoves, etc. (including amplifiers).
  8. Grounding or Polarization: take precautions so that these attributes are not defeated.
  9. Power-Cord Protection: route power supply cords so they will not be walked on or pinched by items.
  10. Cleaning: use 'canned air' or wipe the amplifier with a soft cloth. Do not use solvents, as they may damage the amplifier.
  11. 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.
  12. Moisture: do not expose the amplifier to dripping or splashing. Do not place objects filled with liquids (ex. vases, drinking glasses) on the amplifier.
  13. Damage Requiring Service: have the amplifier serviced by a qualified service technician when the power cord or power supply is damaged, dropped, the enclosure is damaged, something has spilled into the amplifier, it has been exposed to rain, or the amplifier is not operating properly.
  14. Servicing: do not attempt to self-service the amp. Contact Sonance Technical Support for servicing options.
  15. Power Requirement: do not connect the Sonance amplifier to the accessory outlet of any other component.

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 should not place the amp in a confined area during operation.

  1. Storms: to prevent damage to components, unplug all electronic equipment during thunderstorms.
  2. 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.

FCC Compliance Statement: 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. 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 UA 2-125 | UA 2-125 ARC is a high power 2-channel audio amplifier equipped with advanced DSP functionality, capable of delivering an enhanced user experience with perfect matching to other Sonance speaker products. HDMI or S/PDIF (coaxial or Toslink) in addition to Stereo Analog Line Inputs and Line Outputs provide reliable connectivity. Specific equalization presets allow multiple speaker types and acoustic environments to easily be set-up and optimized within minutes. Features the SonARC Setup and Control App to link via short-range wireless connectivity to securely configure the device. The amplifier has automatic protection features to safeguard against overload, low impedance load, thermal overload and over/under power voltage situations.

Placement

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. Locate the amplifier on a shelf or at the lowest place in a rack that has good circulation of fresh air to dissipate heat. The amplifier can be placed into a back box behind a television display or other enclosure with little ventilation as long as the ambient temperature does not exceed 35-degrees Celsius.

Unpacking and Record Keeping

Save the carton and packing inserts for future safe transport in case the amplifier is moved or requires shipping for repair. Before proceeding with installation, locate the serial number on the rear panel of the unit and note it here for future reference:

S/N: __________________________________________
Date of Sale: ___________________________________
Dealer Name: __________________________________
Contact Info: ___________________________________

Front and Rear Panel Connections

UA 2-125 Amplifier Panels:

UA 2-125 ARC Amplifier Panels:

Power Inlet Panel Details:

The UA 2-125 and UA 2-125 ARC amplifiers feature a removable power cord. Plug the female end of the power cord into the Power Cord Connector on the amplifier rear panel (9). The male end of the power cord is to be plugged into a wall socket at a later step.

Audio Connector Panel Details:

Speaker Connections: The removable speaker block connectors (3) accept up to 12-gauge wire. Ensure no bare wires contact the amplifier chassis. The panel provides connectivity to signal sources and amplifier speaker output. Digital inputs include 2-channel PCM (S/PDIF) over COAX or Toslink for UA 2-125, and HDMI for UA 2-125 ARC (4). Both models support analog line input (6) and output (7).

Pressing the setup button (1) reactivates the internal radio if it has been turned off via the SonARC control app.

Status Indicator (5) shows power presence and the amplifier's current operational state.

Clip indicator (8) shows when the amp is being overdriven.

Both models feature a 3.5mm IR port (2) for connecting an infrared receiver, enabling control with common IR remote controls.

Status Indicator LED Guide:

SonARC App Setup

The UA 2-125 amps are configurable via iOS or Android app over short-range wireless connectivity. A smart device with Bluetooth® enabled is required. Download the "SonARC for Sonance UA Series" app from the iOS or Google Play store, or scan the provided QR codes.

Connect to Amplifier:

  1. Launch the app within range of the amplifier (up to ten meters, depending on obstructions).
  2. The amplifier should appear on the app's home screen. If not, press and release the SETUP button on the amplifier's audio connector panel. The indicator LED will blink blue.
  3. The amp will appear on the homepage. Drag down to refresh the search. The app also lists previously connected amplifiers.
  4. Note: If more than 5 UA amplifiers are in range, turn off the BLE Radio in all but one, or configure one amplifier at a time.
  5. When multiple amplifiers are displayed, tap the sound icon in the blue amp tile to trigger pink noise for identification.
  6. Once the amp appears, tap it to begin setup and configuration.

Refer to the Amplifier Configuration Chart for recommended basic settings.

Figure 1: Connecting the Amplifier (Illustrates the SonARC app interface for connecting to an amplifier.)

*The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc.

Amplifier Configuration

Suggested Settings for Initial Configuration of Amp and Sources:

GENERAL
AutosenseAlways ON
VOLUME
No setting changes for eARC sources; Set amp volume to "fixed" for most other source applications.
INPUTDefault | SecondaryAs Required
Source Switching ModeDuck/Mute/Mix
Input Trim0 dB (or as required to match source signal)
AMP & DSP
Output Trim0dB (8 ohm) -3dB (4 ohm)
DSP PresetNone Applied

Powering the Amplifier

The UA 2-125 and UA 2-125 ARC feature a removable power cord. The amplifier starts automatically when power is applied. The Status LED will illuminate GREEN when connected to power. For electrical services with frequent sags, spikes, or brownouts, use a power conditioner designed for high-fidelity equipment.

IMPORTANT: Do not plug the amp's power cord into a convenience outlet on any other audio or video component.

Source Connections

UA 2-125: Features stereo analog line input and S/PDIF (Coax and Toslink) digital input signal types. Connect to either Coax or Toslink, but not both. The amplifier automatically detects the active input.

UA 2-125 ARC: Features stereo line input and HDMI digital input signal types. Use a high-quality HDMI 2.1 certified cable to connect to a TV's "ARC" or "eARC" port. Connect the other end to the UA 2-125 ARC's HDMI IN port. Ensure the connected TV's audio settings are set to "PCM" (typically found under "audio" or "sound" settings as "Digital Audio Out", "Audio Format", or "HDMI Audio Format").

Figure 2: Source Connections (Diagrams showing analog, coax, Toslink, and HDMI input connections for both models.)

Speaker Connections

For optimal performance, use pure copper speaker wire that complies with fire rating codes. Check local codes for wire installation in walls or ceilings. The amplifier uses speaker block connectors that accommodate up to 12-gauge wire.

Figure 3: Speaker Block Connector (Illustrates the speaker block connector.)

Standard Stereo: For a standard speaker pair, connect speaker wire from the left speaker to the left portion of the speaker block connector (positive to positive, negative to negative). Repeat for the right speaker. Plug the connector into the amplifier's speaker output port.

Figure 4: Standard Stereo Connection (Diagram showing standard stereo speaker wiring.)

Power Sharing Mode:

UA 2-125 amps can be set up for Power Sharing Mode to achieve a max 250W power from a single channel output. This mode is recommended for subwoofers or speakers requiring high power. Deploying Power Sharing Mode for a pair of speakers requires two amplifiers. For one subwoofer, one amplifier is sufficient.

Speaker Output Connections (Power Sharing Mode): Speaker wire connection must be made to the positive and negative wire ports on the speaker block connector on the LEFT CHANNEL ONLY. Leave the right channel ports empty.

Figure 5: Power Sharing Mode Connect Left Channel Speaker Out Only (Diagram showing speaker output connection for Power Sharing Mode.)

Source Input Connections (Power Sharing Mode for Subwoofer): When connecting a source for a subwoofer in Power Sharing Mode, connect the inputs for both Left and Right channels. In the SonARC App, set the Amp Output Channel Configuration to "Sum Mono to L Output". Remember to set the sub's DSP filter.

Figure 6: Power Sharing Mode for Subwoofer (Diagram showing subwoofer input connections for Power Sharing Mode.)

Source Input Connections (Power Sharing Mode for Stereo Speakers): Connect the Left input to the amp designated for the Left speaker and the Right input to the amp designated for the Right speaker. In the SonARC app, under Amp & DSP | Amplifier Output, set the Channel Configuration to "L Only to L Output" for the Left Channel Amplifier, and "R Only to L Output" for the Right Channel Amplifier.

Figure 7: Power Sharing Mode, Two Amps for Stereo (Diagram showing stereo speaker input connections for Power Sharing Mode.)

Figure 8: Power Sharing Mode, Two Amps for Stereo (Illustrates app settings for Power Sharing Mode.)

Mounting the Amplifier

The UA 2-125 and UA 2-125 ARC amps feature a T-slot chassis design for flexible mounting and placement.

Mounting Bracket Installation: The included ambidextrous mounting brackets can be configured for either bottom-mount or top-mount (inverted) installation.

  1. Prepare the Brackets: Loosen screws on each bracket arm (do not remove).
  2. Insert Brackets into Chassis: Slide brackets into the T-slot openings at both ends of the chassis.
  3. Position for Mounting Orientation: For bottom-mount (right-side up), position brackets on the bottom T-slots. For top-mount (inverted), position on the top T-slots, ensuring the flat portion aligns with the mounting surface.

Figure 9: Attaching The Brackets - Bottom-Mount (Diagram showing bracket attachment to the chassis.)

  1. Secure the Brackets: Tighten all screws to firmly secure the brackets.
  2. Mount to Surface: Position the amplifier with brackets flush against the desired mounting surface. Ensure adequate clearance for cable connections. Secure with appropriate screws (minimum four recommended).

Figure 10: Mount to Surface (Diagram showing amplifier mounted to a surface.)

IMPORTANT: Before mounting, ensure all audio and power connections are made and verified. Verify that the selected location provides proper ventilation.

T-Nut Installation: Four T-Nuts slide into the T-slot chassis for universal T-slot hardware attachment. Use screws from the amp brackets to secure them.

Figure 11: T-Nuts (Illustrates T-Nuts.)

DIN Rail Installation: Compatible DIN rail adapters can be used with the T-slot chassis design for DIN rail mounting applications. DIN rail hardware information is available online.

Figure 12: Din Rail (Illustrates DIN rail mounting.)

NOTE: Always verify that the mounting method can safely support the amplifier's weight (UA 2-125: 5lbs 4oz / UA 2-125 ARC: 5lbs 6oz) and that proper ventilation is maintained.

Protection Circuitry

The amplifier has a multi-stage protection system to prevent damage to your amplifier and speakers.

Amplifier Channel Protection: If a channel encounters a short-circuit or extremely low impedance, the amplifier will self-protect.

Status Indicator LED:

The status indicator displays the amplifier's present state, unless set to a ten-second timeout. These settings can be adjusted in the Sonance SonARC App under "General". LED Level can be set to Low, Medium, or High, and LED Timeout can be set to Always On (default) or ten seconds.

Clip Indicator LED: When being overdriven, audio peaks display as RED flashes. If this occurs, reduce the volume control until the peaks no longer cause illumination of the Clip Indicator.

SonARC App Guidelines

Detailed descriptions and setting information for the SonARC for Sonance UA Series App.

General Page: Allows naming the amplifier and configuring power saving (Auto Sense, Sleep Mode), LED indicator behavior (timeout, brightness), and BLE radio status. Requires Bluetooth® connection.

Figure 13: General App Screen (Screenshot of the General settings page.)

Volume Page: Controls master volume, mute, turn-on volume, and volume limit. Adjustments can be made via pop-up controls or sliders.

Figure 14: Volume App Screens (Screenshots of volume control settings.)

Inputs Page:

Input Trim: Use to match input sensitivity to the source signal level. Digital sources are typically referenced to 0dBFS. Analog sources default to 0dB for 2Vrms output; adjustments can be made for sources with lower output levels (e.g., +6dB for 1V, +12dB for 500mV, etc.).

Figure 15: Input App Screen (Screenshot of input settings, including Input Trim.)

* 0dB Input Trim gain: 2Vrms max signal
* 6dB Input Trim gain: 1Vrms max signal
* 12dB Input Trim gain: 500mVrms max signal
* 18dB Input Trim gain: 250mVrms max signal
* 24dB Input Trim gain: 125mVrms max signal

Do not set Input Trim higher than needed, as it can cause clipping, distortion, and potential speaker damage.

Volume Tracking: For analog sources, enables tracking of the master volume or maintains a fixed level. If set to "Off", volume must be adjusted at the analog source.

Figure 16: Line Output App Screen (Screenshot showing Line Output settings.)

Inputs - Source Switching: Defines primary and secondary sources, and switchover behavior (Mute, Duck, Mix). Switching Hold Time sets the duration audio holds after source stops.

Line Output Page: Manages line output behavior for daisy-chaining amplifiers or outputting to subwoofers. Settings include volume tracking, level trim, infrasonic filter, channel configuration, phase, and audio delay.

Amp & DSP Page:

Amplifier Output -> Channel Configuration:

  1. 2-channel stereo (L & R) mode: 2 x 125 watts.
  2. Single Channel Power Sharing (L) Mode: 1 x 250 watts into a 4-ohm load. Channel Configuration options include "Sum Mono to L Output", "L Only to L Output", or "R Only to L Output" for routing source channels to the L output.

Output Trim: For most installations, leave at 0dB (default) for stereo (8Ω) or single channel (8Ω, 6Ω, or 4Ω) operation. When driving lower impedance loads, adjust in the SonARC App for optimal performance.

LOAD IMPEDANCE# CHANNELSOUTPUT TRIM SETTING
10dB
20dB
2-1.5dB
2-3dB

Figure 17: Amp & DSP App Screen (Screenshot of Amp & DSP settings.)

Figure 18: Amp & DSP App Screen (Another view of Amp & DSP settings.)

DSP: Equalization curves can be applied to compensate for frequency response. Audio can be delayed by up to 30 milliseconds.

Sonance offers an extensive library of DSP EQ curves and downloadable presets.

Downloading Presets from the DSP Library: Tap "Download" to browse presets for Sonance and James speakers/subwoofers. Select a preset file to download. Use the back arrow to return to saved presets.

Figure 19: Downloading DSP Presets from the Sonance EQ Library (Screenshot of the DSP preset download interface.)

Loading Presets: Tap a profile from the stored presets list, then tap "Load" to apply it.

Figure 20: DSP App Screens (Screenshots showing preset loading.)

Saving Presets: After making adjustments, name and save the DSP profile to the "Saved Presets" list.

Figure 21: Saving DSP Presets (Screenshot of saving a DSP preset.)

Deleting Saved Presets: Tap and hold a profile in the "Saved Presets" list, then confirm deletion.

Figure 22: Deleting Saved Presets (Screenshot for deleting presets.)

Editing Presets: Download and load a DSP EQ Preset, then select "Edit" to access Parametric EQ, Frequency, Q/Bandwidth, Gain, Crossover, Tilt Control, Delay, and Limiter settings.

Parametric Equalization: Configure ten bands of parametric equalization. Filters can boost or cut frequencies with adjustable bandwidth. Each band can be turned on or off.

Figure 23: Parametric EQ App Screen (Screenshot of the Parametric EQ interface.)

Crossover | Delays: Adjust crossover and tilt control for high/low passed signals to woofers/tweeters. Apply delay compensation in time or distance units (up to 29.4ms, 32.8 feet, or 10 meters).

Figure 24: Crossover, Delay App Screens (Screenshots of Crossover and Delay settings.)

SonARC App Guidelines - Detailed Settings:

APP SETTINGSELECTIONSDETAILS
GENERAL
NameText FieldEnter desired name for amplifier; appears in list of available amps in homepage.
Auto-ON ModeAuto Sense or Always OnAuto Sense activates/wakes the amp from sleep mode automatically when incoming audio is detected. When Always On is selected, the amp will not go into sleep mode.
Sleep Mode1-180 MinutesSleep mode puts the amp into power saving mode. Use this setting to choose the duration of time before the amp goes into sleep mode after no incoming audio is detected. Adjust the value by tapping "+" or "-" in the pop up, or press and adjust the slider to the left and right. Select "OK" to confirm and save choice.
LED Timeout10 Sec or Always OnBy default, the amp indicator LED will remain illuminated at all times. If this setting is changed to "10 Sec", the LED will turn off after 10 sec and will not reilluminate until the amp receives a new signal or setting adjustment (ie. switchover behavior is changed).
BLE Radio SetupAlways On, 2 Min Time Out, or OffTo restrict remote access to the amp's settings, the BLE radio can be disabled. A 2-minute timeout can be set to allow adjustments for a short period after the amp is turned on, or it can be set to Off to disable immediately. Once disabled, the amp will no longer be visible in the app. To restore discoverability, press the setup button on the amplifier. The BLE radio setting will default to "Always On" following this action.
LED LevelLow, Middle, or HighDefines indicator LED brightness that illuminates on the connector panel of the amp.
RestartCancel or RestartWould you like to restart the amp? Make selection in pop up window.
VOLUME
Volume0-30Master volume; can simultaneously control the volume of all input sources as well as the volume of the amp and line-out. Adjust the volume by tapping "+" or "-" in the pop up, or press and adjust the slider to the left and right. Select "OK" to confirm and save.
MuteOff or OnSelect "On" to mute all amplifier channels. Select "Off" to return to normal volume output from all channels.
Turn-On VolumeFixed or LastDefines the volume condition upon amp startup. Select "Fixed" to define the value for the volume (0-30), or "Last" to keep the volume as it was in the last state before the amp was in sleep mode or standby.
Volume Limit1-30Sets the maximum volume control level the amplifier can reach. Adjust the volume limit by tapping "+" or "-" in the pop up, or press and adjust the slider to the left and right. Select "OK" to confirm and save choice.
INPUTS - DIGITAL SOURCE
Input Trim0.0 dB - 6 dBBy default, the digital source input trim is set to 0.0 dB as it will apply to most use cases. The input trim can be adjusted by 0.5 dB increments if TV output is not sufficient or if the TV volume level needs to be reduced. Adjust the input trim by tapping "+" or "-" in the pop up, or press and adjust the slider to the left and right. Select "OK" to confirm and save.
INPUTS - ANALOG SOURCE
Input Trim0 dB - 24 dBBy default, the analog source input trim is set to 0.0 dB as it is optimized for most sources that have 2v maximum output. The input trim can be adjusted by 0.5 dB increments according to the output level of the source device. Adjust the input trim by tapping "+" or "-" in the pop up, or press and adjust the slider to the left and right. Select "OK" to confirm and save. Adjust to +6 dB for sources with 1v output, +12 dB for sources with 500mV output, +18 dB for sources with 250mV output, +24 dB for sources with 125mV output.
Volume TrackingOff or OnWhen turned "On", volume tracking lets the analog input track to the master volume. When set to "Fixed", volume will remain at a fixed level. When set to "Off", the volume will not be adjusted in the amp, but instead will need to be adjusted using the analog source.
INPUTS - SOURCE SWITCHING
Default SourceAnalog or DigitalDefines which source input will be primary to activate the amplifier.
Secondary SourceNone, Analog, or DigitalDefines which source input will be secondary. In "Mute" and "Duck" modes, a signal on the Secondary Source will override playback of the Default source. Select "None" if no second source is connected.
Switchover BehaviorMute, Duck, or MixDefines how dual input sources behave if there is incoming audio for both inputs at the same time. When "Mute" is selected, the default/primary source will mute when there is incoming audio from the secondary source. When "Duck" is selected, the default source volume will significantly reduce (-20 dB) when there is incoming audio from the secondary source. When "Mix" is selected, the inputs will combine equally.
Switching Hold Time1-30Defines the length of time audio will hold when switching sources from one input source to another after audio stops.
LINE OUTPUT
Volume TrackingOff or OnWith volume tracking set to "On", the line output level will increase and decrease with the volume of the Sonance amp. Volume tracking set to "Off" keeps the output at a consistent level regardless of the Sonance amp volume.

AMP & DSP - AMPLIFIER OUTPUT

APP SETTINGSELECTIONSDETAILS
Channel ConfigurationStereo2-CH, Mono-2CH, L Only to L Output, R Only to L Output, Sum Mono to L OutputUse L Output settings to get 250w single channel power from L speaker output into a single 4 ohm load. Connect speakers to L channel only. This setting allows you to control which source channels are routed to the L output.
PhaseNormal or InvertedBy default, the amp output phase will be set to "Normal". You may choose to invert the line out phase to correct speaker polarity or passive subwoofer phase correction.
Amp Output Trim-6 dB - 0 dBSet the Amp Output Trim to properly accommodate the amplifier load. In Stereo Configuration, set the trim to 0 dB for 8 ohm; -1.5 dB for 6 ohm; -3 dB for 4 ohm. In Mono configuration, set the trim to 0 dB for all loads.
AMP & DSP - DSP PRESET
NameText FieldEnter desired name for preset. This will be the name of the DSP profile when selected for "Save" and will appear in the list of saved presets on the bottom of the screen.
LoadMust Select a Saved Preset to ImportSelect from downloaded DSP Presets in the Saved Preset list at the bottom of the screen before pressing "load". If no saved presets are listed, click the "Download" button to select an EQ profile from the library.
SaveCancel or SureSave the current DSP settings for future recall? If adjustments are made to an imported profile, the new DSP/EQ profile/preset can be saved into the Saved Preset list.
EditLoads an Editing MenuEdit and apply Parametric EQ, Frequency, Q/Bandwidth, Gain, Crossover, Tilt Control, Delay, and Limiter settings to an already loaded DSP Preset.
Saved PresetsDownloadBrowse the Sonance custom DSP preset library designed specifically to optimize a range of Sonance speakers and subwoofers. Once downloaded, use the import function to load the custom preset from the menu below.
PROFILE BACKUP
Backup ProfileText Field: enter a file name for the profile, saveSave a backup profile to restore all amplifier settings, IR codes, and DSP to a previous configuration for easy recall. Saved profiles are accessible after factory reset.
Restore ProfileLoadRestore the currently selected profile to apply all saved amp settings? Select "Cancel" or "Sure". A profile from the list of Available Backup Files must be selected to initiate. If no profiles are listed, a backup profile must be created. See "Backup Profile" above.
Share Profile-Send an amplifier profile to another device via email, AirDrop, etc.
Available Backup Files-A list of all saved backup profiles will appear here. If no profiles are listed, a backup profile must be created. See "Backup Profile" above. Backup files are also saved to the device's FILES folder as a .bin file.
PROFILE BACKUP - RESET
Reset All SettingsCancel or SureIt is recommended to save a backup profile before reset. Would you like to reset all amp settings to factory defaults? Select "Cancel" or "Sure". CAUTION: This function will erase all settings and return the amplifier to its factory default!
STATUS
Normal, Too Hot, or System ProtectionDisplays current amp status.
IR LEARNING
Power On-Plug the included IR receiver into the amp to configure an IR remote to control the amp. Press Learn, and choose the remote button you wish to program to control the selected function. NOTE: When IR 3.5mm cable is inserted into the IR port, all digital communications will be disabled (ie. CEC, eARC, S/PDIF commands such as ON/OFF, Volume UP/DOWN). Select "Learn" to initiate signal for IR learning
Power Off-Select "Learn" to initiate signal for IR learning

Updates:

APP SETTINGSELECTIONSDETAILS
Volume Up +1-Select "Learn" to initiate signal for IR learning
Volume Down -1-Select "Learn" to initiate signal for IR learning
Volume Up +3-Select "Learn" to initiate signal for IR learning
Volume Down -3-Select "Learn" to initiate signal for IR learning
Mute On-Select "Learn" to initiate signal for IR learning
Mute Off-Select "Learn" to initiate signal for IR learning
Mute Toggle-Select "Learn" to initiate signal for IR learning
UPDATES
Firmware-Displays the firmware version currently installed.
Installed Version-Displays the firmware version currently available.
Latest Version-Displays the firmware version currently available.
UpdateLocal or InternetProceed with firmware update? Select "Local" or "Internet", then select "Update Now" or "Cancel" at any time to terminate update process.

Specifications

UA 2-125 | UA 2-125 ARC Amplifier Power Requirements:

MODELINPUT VOLTAGEOUTPUT POWER (SINEWAVE)AC POWER DRAW15 AMP BREAKER QTY OF AMPLIFIERS20 AMP BREAKER QTY OF AMPLIFIERS
UA 2-125
North America SKU: 93550
International SKU: 93551
100-240V ACFull Power All Channels @8 ohms300W810
UA 2-125 ARC
North America SKU: 93548
International SKU: 93549
Full Power All Channels @4 ohms300W
1/4 Power All Channels @8 ohms80W
1/4 Power All Channels @4 ohms80W
@ Idle8W
Sleep Mode<0.5W

UA 2-125 | UA 2-125 ARC Amplifier Specifications:

Troubleshooting

No Power: Audio Connector Panel status LED does not illuminate when AC cord is plugged in and amp is switched on.

No Audio: Status indicator illuminated Green but no audio from speakers.

Channel Out: One channel of the amp does not have output.

Protect Mode: Status Indicator LED is flashing RED.

Limited Two (2) Year Warranty

Sonance warrants to the first end-user purchaser that this Sonance-brand product (Sonance UA 2-125 or UA 2-125 ARC), 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 UA 2-125 or UA 2-125 ARC 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 Sonance UA 2-125 or UA 2-125 ARC Amplifier 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. Write the RMA # on the shipping label, not directly on the product carton.

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

©2025 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
08.12.2025 REV3

Models: SONAMPUA2125HDMI 93548, UA 2-125 UA 2-125 ARC 2 Channel 250 Watt Power Amplifier, UA 2-125 UA 2-125 ARC, 2 Channel 250 Watt Power Amplifier, 250 Watt Power Amplifier, Power Amplifier, Amplifier

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