Marathon MA-4050

MA Pro Series 2-Channel Class AB Professional DJ Amplifier with Front & Back Cooling Fans


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Product Features

  • MA Pro Series 2-Channel Class AB Professional DJ Amplifier
  • RMS Power Rating
    • 8 ohms: 800 watts x 2 chan.
    • 4 ohms: 1300 watts x 2 chan.
    • 2 ohms: 1500 watts x 2 chan.
    • Bridged @ 8 ohms: 2000 watts x 1 chan.
    • Bridged @ 4 ohms: 4000 watts x 1 chan.
  • 7-Way protection circuitry (full short circuit, open circuit, thermal, soft start, DC voltage, Sub Electronic and RF)
  • Bridge, Parallel, Power, Clip and Protect LED indicators
  • Two variable low noise speed fans to prevent overheating
  • 4 Pole speakon and binding post output connectors
  • Front-2 input attenuators REAR Ground lift, mode selection, compressor panel controls
  • LED Indicators:
    • Power: 1 x Blue LED
    • Signal: 2 x Green LED
    • Clip: 2 x Red LED
    • Protect: 1 x Red LED
  • Frequency Response: 15-25,000 Hz
  • THD + Noise (Total Harmonic Distortion): <0.03%
  • Signal-to-Noise Ratio: >102 dB
  • Damping Factor: >400:1
  • Selectable Input Sensitivity (0.77V / 1.0V / 1.44V)
  • Input Impedance: 10K ohm
  • Input Connectors: Female XLR-3 & 6.35mm TRS jack
  • Power Supply: 110/220V AC
  • Dimensions: 18-3/4"L x 19"W x 4"H
  • 1-year Manufacturer's warranty

Power Specifications

Number of Channels
This is the number of channels that the professional amplifier is designed to power.
2 Channels
Continuous Power @ 8 ohm
This is the continuous (RMS) power output of the amplifier at an 8 ohm impedance.
800 watts x 2 channels
Continuous Power @ 4 ohm
This is the continuous (RMS) power output of the amplifier at an 4 ohm impedance.
1300 watts x 2 channels
Continuous Power @ 2 ohm
This is the continuous (RMS) power output of the amplifier at an 2 ohm impedance.
1500 watts x 2 channels
Continuous Power @ 8 ohm (Bridged)
This is the continuous (RMS) power output of the amplifier at a bridged 8 ohm impedance.
2000 watts x 1 channels
Continuous Power @ 4 ohm (Bridged)
This is the continuous (RMS) power output of the amplifier at a bridged 4 ohm impedance.
4000 watts x 1 channels
Total Continuous Power
This is the total continuous power rating (RMS) that the amplifier is able to output.
4000 watts

Amplifier Specifications

Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
>102 dB
Frequency Response
The range of frequencies the amplifier will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
15 - 25000 Hz
Input Sensitivity
This is the input sensitivity of the amplifier.
1.44 volts
THD (Total Harmonic Distortion)
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
Cooling Options
These are the different cooling systems used in the amplifier to keep it cool.
Cooling Fan

Physical Specifications

The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
Weight (Pounds)
This is the weight of the item in pounds (lbs).
60 lbs
Rackmount Spaces
This is the total number of spaces that the preamplifier will occupy when mounted on a rack.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


los angeles, california

Huge amount of power

October 28, 2012

Its a boat anchor weighing in about 50lbs.
Very dependable compared to hot and over heating digital power amps which are terrible.
Lots of bass, lots of everything. There is some THD but you have to
expect that from 800 wpc. I ran mine for 12 hours straight at a Octoberfest event without a hitch. Highly recommend for the price and power.

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Product Summary


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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Marathon MA-4050

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Marathon MA-4050

MA Pro Series 2-Channel Class AB Professional DJ Amplifier with Front & Back Cooling Fans


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