4.5 out of 5
Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier
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Pricing Note
Product Description
Manufacturer Part Number: MA1240a
Dayton Audio's MA1240a freestanding, twelve channel amplifier was designed for custom multi-room sound distribution. Its intelligently engineered and versatile design integrates easily into high-end whole house audio systems.
We stand behind our products and our warranty is a demonstration of our commitment to quality and reliability.
Key Features:
Overview:
Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier
Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier
The high-density solution to the challenges of multi-room audio
The Dayton Audio MA1240a features a Class-AB output circuit that delivers superior audiophile sound quality and stable performance. Each of your installation's zones can benefit from the MA1240a's clean audio reproduction and exceptional functionality. The MA1240a can be stacked with other audio components and includes removable ears for mounting in standard audio racks (2RU).
Includes Automatic, 12V Trigger, and Manual power modes
Each zone has bi-color LEDs to indicate its operational status
Two Bus inputs can be routed to any channel, or use individual inputs per channel
Two channels can be bridged to increase the total power to that zone with a single switch
Inputs and Outputs
Two common or BUS inputs feed audio signals from standard line-level audio sources to any or all channels. Each of the twelve channels has its own dedicated input and independent level adjustment to provide further flexibility. By simply flipping a single switch, two channels can be bridged to increase the total power output for that zone. This is helpful when extra power is needed in certain areas.
Convenient Features
Manual, automatic on/off, or triggered 12V input turn-on modes facilitate easy integration into automated systems. For quick and easy troubleshooting of the system, each pair of channels or zones has a bi-color LED to indicate its operational status. Use 14-18 AWG stranded two-conductor loudspeaker wire with Phoenix style connectors.
NOTE: See setup addendum when using in-wall volume controls. You can find this document under "Manuals and Resources" on this page.
Connectivity
5. Trigger I/O: 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.
7. 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.
9. Speaker Output Terminals: The MA1240a uses high quality Phoenix style connectors (5 mm pitch) 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 1/4 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.
11. 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.
4. 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. "Auto" setting senses a signal on the RCA line-level inputs and automatically puts the amp in ready mode. "On" setting puts the amp constantly in 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.
6. 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.
8. 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).
10. Individual Channel Output: All twelve channels have their 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.
12. IEC Power Connector: The unit comes with an IEC jack that permits 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.
Specifications:
Additional Resources
We pride ourselves on being an authority in the speaker building and DIY community. With over 60 years of combined engineering experience, our team of engineers is here to help with your build. Below are some useful tools to get you started.
Specification:
Manuals & Resources:
Dayton Audio's MA1240a freestanding, twelve channel amplifier was designed for custom multi-room sound distribution. Its intelligently engineered and versatile design integrates easily into high-end whole house audio systems.
We stand behind our products and our warranty is a demonstration of our commitment to quality and reliability.
Key Features:
- Robust 60 WPC output at 4 ohms, 40 WPC output at 8 ohms
- Independent and bus inputs enable unparalleled flexibility
- Bridgeable channel outputs provide additional power when needed
- Independent channel gain controls allow the output of each speaker to be perfectly matched
- Multi-stage protection circuitry for reliability and easy troubleshooting of audio system
- Temperature controlled cooling fans
- ENERGY STAR and CE EuP directive compliant, consumes less than 1/2 a watt in standby
Overview:
Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier
Dayton Audio MA1240a Multi-Zone 12 Channel Amplifier
The high-density solution to the challenges of multi-room audio
The Dayton Audio MA1240a features a Class-AB output circuit that delivers superior audiophile sound quality and stable performance. Each of your installation's zones can benefit from the MA1240a's clean audio reproduction and exceptional functionality. The MA1240a can be stacked with other audio components and includes removable ears for mounting in standard audio racks (2RU).
Key Specs:
- Channels: 12
- Power Handling @ 8ohms (RMS): 40 Watts
- Power Handling @ 8ohms (Bridged): 80 Watts
- Frequency Response: 5Hz- 72kHz
- Inputs: 2 Stereo Bus Inputs, 1 mono input per channel
- Outputs: 2 Stereo Bus Outputs
Power Management
Includes Automatic, 12V Trigger, and Manual power modes
Status LEDs
Each zone has bi-color LEDs to indicate its operational status
Stereo and Mono Inputs
Two Bus inputs can be routed to any channel, or use individual inputs per channel
Bridgeable Outputs
Two channels can be bridged to increase the total power to that zone with a single switch
Inputs and Outputs
Two common or BUS inputs feed audio signals from standard line-level audio sources to any or all channels. Each of the twelve channels has its own dedicated input and independent level adjustment to provide further flexibility. By simply flipping a single switch, two channels can be bridged to increase the total power output for that zone. This is helpful when extra power is needed in certain areas.
Convenient Features
Manual, automatic on/off, or triggered 12V input turn-on modes facilitate easy integration into automated systems. For quick and easy troubleshooting of the system, each pair of channels or zones has a bi-color LED to indicate its operational status. Use 14-18 AWG stranded two-conductor loudspeaker wire with Phoenix style connectors.
NOTE: See setup addendum when using in-wall volume controls. You can find this document under "Manuals and Resources" on this page.
Connectivity
Front
- 1. Power: 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.
- 2. 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.
Rear
3. BUS Line I/O: The MA1240a has two common or BUS inputs that receives audio signals from standard line-level audio sources and sends 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.5. Trigger I/O: 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.
7. 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.
9. Speaker Output Terminals: The MA1240a uses high quality Phoenix style connectors (5 mm pitch) 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 1/4 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.
11. 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.
4. 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. "Auto" setting senses a signal on the RCA line-level inputs and automatically puts the amp in ready mode. "On" setting puts the amp constantly in 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.
6. 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.
8. 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).
10. Individual Channel Output: All twelve channels have their 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.
12. IEC Power Connector: The unit comes with an IEC jack that permits 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.
Specifications:
- Channels: 12
- Power Handling (RMS): 40 Watts
- Power Handling (MAX): 80 Watts
- Frequency Response: 5Hz - 72kHz
- Input Sensitivity: 380 mV
- SNR, A-Weighted: 105 dB
- Total Harmonic Distortion: 0.09%
- Inputs: 12 individual inputs, 2 Stereo Bus Inputs.
- Outputs: 2 Stereo Bus Outputs
- Power Requirements: 115 - 230 VAC
- Standby Consumption: 0.264 Watts
- Dimensions: 16.7" W x 14.25" D x 4" H
- Weight: 38 lbs.
Additional Resources
We pride ourselves on being an authority in the speaker building and DIY community. With over 60 years of combined engineering experience, our team of engineers is here to help with your build. Below are some useful tools to get you started.
Specification:
Product Details | |
|---|---|
| Brand | Dayton Audio |
| Model | MA1240a |
| Part Number | 300-815 |
| UPC | 844632081095 |
| Unit of Measure | Each |
| Weight | 38 |
Product Specifications | |
|---|---|
| Power (RMS/Channel 8 ohms) | 26 - 50 Watts |
| Weight Range | 30 to 39 lbs. |
Manuals & Resources:
Attention CA Residents: Prop 65 Warning
WARNING:
This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Need more information?
Our staff are available to answer any questions you may have about this item
Our staff are available to answer any questions you may have about this item
Customer Reviews
By juan c.
Date: February 11, 2025
calidad garantizada
Rating: 
[5 of 5 Stars!]
[5 of 5 Stars!]
By Husband with kids
Date: June 09, 2024
When I moved into my house four rooms and the outside were professionally wired for audio, but they didn’t leave the amp for the next 10 years I settled for a single zone inexpensive 100watt amp and distribution switch since it wasn’t a priority. This sounded fine at low volume, but was ineffective for the outdoor speakers. I decided to up my game so I could have some decent tunes while in the pool. So far I’m very impressed with this amp. I have wall volume controls in each room, but the ability to control the max volume for each speaker has allowed me to insure my kids can’t crank the volume inside excessively loud ( I capped these are at 35) and pump up the max to the outside speakers (gain is at 75). The setup is very easy and the instructions very clear. For the price I think this is a great choice. I almost splurged on the more expensive model with the built in AirPlay, but I appreciate the physical switches on this one. The auto turn on (trigger) and turn off work great. There is almost no lag when the audio source starts feeding signal. I’m using an AirPort Express using AirPlay, and that has a mini phono (stereo headphone) to RCA feeding it. Here are my CONS in order of importance (no show stoppers): In bridge mode, it does mix the channels to mono, but you can’t control the left and right speakers independently for the bridged channel/zone. Only the left gain is used and it controls the max volume for each speaker in the pair. I didn’t have this level of control before so it isn’t a show stopper, but since the one of the exterior speaker is close to a seating area and the other isn’t (pointing to the pool) independent control would have been nice. BTW, I used bridge for to power boost and because stereo didn’t make sense with the speakers outside. The gain control for each speaker is very small and is on the rear. It can make tweaking things more inconvenient. Also, it necessitates having some sort of volume control either at the speaker or at the audio source, because you won’t be using these to control volume day-to-day. The amp has a slight hum when running. This doesn’t bother me because the amp is mounted somewhere without people regularly near, but if you were in the same room it could be annoying. This isn’t really a con, but be aware this is fairly large and fairly heavy. If you are putting it on a shelf, make sure you have room for the speaker wires and the power connections. This probably adds another 1.5 inches to its depth, and I’d recommend at least 2 inches so you’re not squishing everything.
Rating: 
[4 of 5 Stars!]
[4 of 5 Stars!]
By Brendan Frankowski
Date: February 23, 2024
Great amp, built well, sounds great and works well. That is, besides bridged mode. For some reason, when you put the speaker in bridged mode left and right are thrown out the window and it gives you a choice between left OR right on both speakers, by switching cables or whatever. Very strange and annoying but it is what it is. I can't seem to find a way to properly use bridged mode on this without that so it's basically a useless feature. Otherwise it's great, maybe runs a bit warm.
Rating: [4 of 5 Stars!]
[4 of 5 Stars!]
By JZing
Date: September 09, 2023
. When you bridge all the speakers you loose the right channel. My previous amp had a switch for left or right for each bus. So I was playing all left channel in all 6 speakers. I did find a way around this by putting the right channel in bus 1 and left in bus 2 but it only works if you have 1 source. So the left or right switch would be a better option on this amp.
Rating: [4 of 5 Stars!]
[4 of 5 Stars!]
By Conor Porter
Date: April 08, 2023
I’m powering JBL pendant speakers throughout a lobby and restaurant and sound is excellent!
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]
By Timothy E Bates
Date: May 03, 2018
Works as intended.. I have 4 zones with a Google audio on each, which let's me stream different music on each, or one stream on all, or some..
Rating: [5 of 5 Stars!]
[5 of 5 Stars!]