Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier-Complete Features/Owner's Guide

It has dependable 40 WPC power at 8 ohms and 60 WPC output at 4 ohms. It has unparalleled flexibility which is made possible by independent and bus inputs. When required, bridgeable channel outputs deliver more power. It is possible to properly match the output of each speaker thanks to independent channel gain settings. It has circuitry with many stages of protection for dependable and simple audio system troubleshooting Thank you for purchasing the Dayton Audio® MA1240a Twelve Channel Multi-Zone Amplifier. The versatility of the MA1240a makes it the perfect choice for almost every type of custom multi-room audio system. Its tabletop or rackmount-able design allows it to be integrated easily into high-end whole house audio systems

FEATURES

12 channels (6 stereo zones) in one convenient enclosure
Stable Class AB design delivers superior audiophile sound quality and performance

Independent and bus inputs provide unparalleled flexibility
Bridgeable channel outputs provide additional power when needed

Independent channel gain controls allow the output of each speaker to be perfectly matched
Switchable 115/230V input voltage

Manual, auto, or triggered on/off for integration into any automated system
Multi-stage protection circuitry for reliability and easy troubleshooting of audio system

Installer-friendly setup and connections
Can be converted easily between rack-mount and tabletop configurations

Heavy-duty steel chassis with brushed aluminum faceplate

INSTALLATION

Dayton Audio amplifiers are designed to help deliver a great audio experience. However, where you place the amplifier can have a large effect on the performance you receive, and the life of the unit. If you are not rack-mounting the amplifier, position it with all feet resting on a solid level surface. Be sure that the amplifier is in a well-ventilated area and DO NOT install the amplifier near a source of heat or in an extremely humid or wet location.

CAUTION
All connections and switching must be done with the amplifier’s power switch positioned to ‘Off’. Connect the power cord last to be sure that the amplifier is off during all of your connections and set up.

FRONT PANEL

Master Power Switch / Indicator LED

The front panel pushbutton power switch turns the amplifier on and off. When the switch is on and the indicator LED is red, the amplifier is in standby mode. The remote turn on switch (located on the rear) is either in the “trigger” or “auto” position. When the LED is blue, the amplifier is fully active. The master power switch will turn off the amplifier no matter which power mode has been selected.

Zone Status Indicators

Each pair of channels or zones has a bi-color LED to indicate its operational status. These indicators provide quick and easy troubleshooting of the system. If the circuitry determines that a channel must be shut down due to excessive heat or low impedance (a short), only the channels that are affected will be turned off causing the zone LED to turn red. The remaining zones will continue to operate and maintain a blue LED status. Once the condition has been corrected for the zone in question, the status LED will return to blue. Note: When the power LED is red and the zone status LEDs are not lit (off), indicates the unit is in standby mode.

REAR PANEL

BUS Line Inputs / Outputs

The MA1240a has two common or BUS inputs that receive audio signals from standard line-level audio sources and send them to any or all channels. The BUS line outputs are direct feed-through to allow the BUS inputs to be fed to other amplifiers. Be sure to use high-quality RCA cables that feature low impedance, shielding, and high-quality connectors.

Remote Turn-On Switch

This switch selects the turn-on stimuli that will put the amplifier in ready mode. “Trigger” setting relies on 3-30V AC/DC voltage going into the trigger input to activate the amplifier. The “Auto” setting senses a signal on the RCA line-level inputs and automatically puts the amp in ready mode. The “On” setting puts the amp constantly in the ready mode so that it can be controlled by the master power switch on the front panel. In “Auto” mode, the amplifier will take approximately 15 minutes to return from ready to standby mode.

Trigger Input / Output

The trigger input is a handy feature when connecting the amplifier to an automated audio system. The 3.5mm miniplug jack will accept a 3-30V AC/DC output from another device, or from a separate power supply. When the trigger input is energized, the amp turns from standby to ON mode.

When using the MA1240a with a receiver without a trigger output, the voltage can come from a 12V wall wart (3.5mm tip-positive connector) plugged into the receiver’s switched outlet and the trigger input. The MA1240a can also provide an output trigger voltage (12DC @500mA max.) to turn on and off other devices in the audio system. When the amplifier turns off (standby mode), the voltage will drop to zero.

Note: Remember there is a delay of approximately 15 minutes before the amplifier goes to standby when using the “Auto” turn-on mode.

Channel Gain Control

Each channel has its own independent level adjustment. This allows the output level of each speaker to be perfectly matched to its area. It can also be used to limit the maximum audio level in a certain area.

Bridging Switch

By simply flipping a single switch, two channels can be combined to increase the total power output. This is helpful when extra power is needed in certain areas. Note: The minimum impedance for bridged channels is 8 ohms. Also, please observe the proper speaker wiring when

bridging channels. Input selection and volume settings for bridged channels will be controlled by the left channel. “BR” is bridged mode and “ST” is non-bridged or stereo mode.

CAUTION: Only change switch positions when the amplifier is turned off.

Input Selection Switch

Each channel is capable of delivering the source from many inputs. The three main inputs are BUS 1, BUS 2 and LINE IN. The selection for these inputs is done via the Input Selection switch associated with each channel. Select the desired source input. Set the Input Selection switch to BUS 1 (will play source connected to the BUS 1 input), BUS 2 (will play source connected to the BUS 2 input) or LINE IN (will play source connected to that channel’s LINE IN).

CAUTION: Only change switch positions when the amplifier is turned off.

Speaker Output Terminals

The MA1240a uses high-quality Phoenix-style connectors for the speaker connections. Use 14-18 gauge stranded two-conductor loudspeaker wire. Ensure that at least 2 inches of each conductor are separated. Strip away ¼ inch of insulation from each conductor. Connect the appropriate conductor to each screw terminal, observing correct polarity. Also, please observe proper speaker wiring when bridging channels.

Individual Channel Input

All twelve channels have theirs own dedicated input that allows the connection of audio sources in addition to the common BUS inputs. This is useful when using the MA1240a with an audio matrix switcher.

AC Voltage Switch

The unit is set at the factory for 115V U.S. operation; simply connect the included IEC power cord to your wall outlet. For 230V operation, move the voltage selector switch to the 230V position. When operating at 230V the internal fuse located in the IEC socket should also be changed. In most 230V applications a separate power cord will be required and is not included.

IEC Power Connector

The unit comes with an IEC jack that permits the removal of the AC power cord. This allows the flexibility of changing the power cord for different countries. The IEC socket also houses the main fuse holder. Plug the power cord supplied with the amplifier into the amplifier and wall outlet or appropriate surge protector.

CAUTION
DO NOT plug the amplifier’s power cord into a switched outlet, such as what is provided on some Surround Receivers. If you wish to have the amplifier turn on when the Receiver is powered up, use one of the power modes, such as Trigger or Auto.

NOTES ABOUT HUM

While the MA1240a has been designed to minimize the possibility of hum in the audio system, it is still possible that hum will occur in rare circumstances. Its safety grounding can create a path for small amounts of 60 Hz energy to travel through the line-level audio system. Although not dangerous, this energy can cause difficulty with the auto signal sensing circuit, and at the very least will interfere with the quiet enjoyment of your system. The first course of action should be trying to make sure that all of the audio components are connected to either the same electrical outlet or at least into the same circuit branch. Next, cable TV systems are notoriously the culprit, so be sure to try disconnecting all coaxial feeds that are connected to the system. If this solves the problem, install a coaxial line isolator and reconnect the system. In the very worst case, a line-level audio isolator/transformer connected to the line-in of the amplifier will usually solve the problem.

IMPORTANT SAFETY INSTRUCTIONS

To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified personnel. To reduce the risk of fire and shock do not expose the unit to rain or moisture. The unit should be connected to an earth-grounded AC electrical socket. The unit should be operated in a well-ventilated area. Minimum clearance is 2 inches from the ventilation openings.

Note: Unit is set at the factory for 120V operation. Be sure to change the fuse (4A rating) before switching to 230V operation.

Frequently Asked Questions

Do Dayton Subs deliver?
No other inexpensive subwoofer we’ve tried can equal the volume, sound quality, and elegance of the Dayton Audio SUB-1200. It boasts a clean, natural sound, which is crucial for music listening, and ample bass power for a mid-size stereo or home theatre system.
Does Dayton Audio originate from China?
Dayton Audio products are made in North America, Europe, and Asia, even though the majority of the engineering and development work is done there.
Who does the audio for Dayton?
Springboro

Do Dayton Speakers deliver?
The Dayton Audio MK402s provide far more than their asking price would lead you to assume, including a revealing sound, crisp bass, and a decent-looking shelf appearance. Connecting to a stereo is made considerably simpler by using the right binding posts. Nothing in this price range provides such an alluring bundle.
What city produces Dayton audio speakers?
Dayton Audio products are made in North America, Europe, and Asia, even though the majority of the engineering and development work is done there.
Who manufactures Skar Audio?
Skar Audio was founded in 2010 by Kevin Schlenker while he was a student at the University of Central Florida. The 10-person business produces premium speakers and amplifiers for vehicles and boats and sells them online directly to consumers and through a dealer network.

What is the finest subwoofer ohm?
For those seeking stronger output, a 2-ohm subwoofer will be louder than a 4-ohm subwoofer, making it the preferable choice. A 4-ohm subwoofer, however, could provide greater sound quality.
Is Skar a reliable name?
Yes, Skar Audio is a high-quality product. Skar Audio may not be the most expensive brand available, but for the money, they provide a wonderful value on a variety of goods. Their speakers are crisp, and their subwoofer is powerful.
Do Rockville subwoofers perform well?
Rockville subs are indeed excellent. They are reasonably priced and offer excellent bass. Rockville is a fantastic option if you’re searching for a solid subwoofer.

Is skar the same as sundown?
Everyone who has read reviews claims that a speaker with the same specifications as a Sundown and a Skar is practically similar, although Skar is frequently over half as expensive as a Sundown.

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References

User Manual

Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier

Specifications

Introduction