We are working hard to process orders! As a result of COVID-19, please understand delivery times may be delayed. View details

Sony XM-GS4 700 Watt Class AB 4-Channel Amplifier

100 % of 100
In stock

Key Features

  • 700 Watts Max Power
  • 4-Channel Amplifier
  • Super compact design
  • Pulse Width Modulated MOSFET Power supply
  • Class AB Design Offers High-Quality Sound
  • Speaker level inputs with auto turn on
Unit includes: 4-Channel power amplifier, Speaker level input harness, Mounting hardware, and Instruction manual

Sony XM-GS4 700 Watt Class AB 4-Channel Amplifier
  • 700 Watts Max Power
  • Pulse Width Modulated MOSFET Power supply
  • Compact Design for Versatile Installation Options without compromising sound quality
  • Class-AB design for excellent sound quality
  • CEA-2006 Compliant amplifier for true power output
  • 3-Way Protection circuit senses internal temperature and automatically lowers input level to prevent heat damage. Short circuit protection prevent damage when speaker leads are shorted. Overload protection prevent damage from low impedance or blown woofers.
  • Removable top cover to reveal all controls
  • Variable Low Pass filters allow you to adjust the playback frequencies from 50Hz to 300Hz at 12dB per octave
  • Variable High Pass filters allow you to adjust the playback frequencies from 50Hz to 300Hz at 12dB per octave
  • Speaker level inputs allow you to connect this amplifier stereo system that do not have RCA outputs. The is very typical for OEM head-units and you can now avoid adding separate line level converters.
  • Remote turn on by auto signal sense, so you do not need to run a remote turn on lead with OEM head-units
  • Bridge mode allows to run this as a three channel or two channel amplifier
  • 4 channel RCA inputs accepts up to 6 volt input signals
  • 4 channel speaker level inputs accepts up to 12 volt input signals
  • Dual Bass boost controls: 0-10dB at 40Hz (Channels 1-2) and (Channels 3-4)
  • Dual variable subsonic filters: 0-12dB at 6Hz - 70 Hz (Channels 1-2) and (Channels 3-4)
  • Gold plated terminals for all connections
  • Frequency Response: 10Hz to 100KHz (Channels 1 - 4)
  • Total Harmonic Distortion (4 Ω): < 0.05% (1kHz)
  • Signal-to-Noise Ratio (IHF-A Weighted, at 1 kHz): >100dB
RMS Power Rating:
  • 4 ohms: 70 watts x 4 channels
  • 2 ohms: 80 watts x 4 channels
  • 4 ohms: 160 watts x 2 channel (Dual Bridged)
    Maximum Dynamic Power Rating:
  • 4 ohms: 150 watts x 4 channels
  • 2 ohms: 175 watts x 4 channels
  • 4 ohms: 350 watts x 2 channel (Dual Bridged)
  • Dimensions: 10-3/4" (W) x 2-1/8" (H) x 8" (D)
More Information
Manufacturer Sony
Part Number XM-GS4
Amplifier Topology Class Class AB
Number of Channels 4 Channel
Total RMS Power at 1 ohm 0.00
Total RMS Power at 2 ohm 320.00
Total RMS Power at 4 ohm 280.00
RMS Output per Channel (x1 at 4 ohms) 0.00 Watts
RMS Output per Channel (x2 at 4 ohms) 160.00 Watts
RMS Output per Channel (x4 at 4 ohms) 70.00 Watts
Amplifier Bridging Bridgable @ 4 ohms
Minimum Impedance in Bridged Mode 4 ohm
Minimum Impedance in Un-Bridged Mode 2 ohm
Strappable Amplifier No
RCA Pre-amp Audio inputs 2 Pairs (Front, Rear)
RCA Pre-amp Audio outputs None
Preamp voltage 6 volts
Speaker level inputs Yes
Gain Control Yes
Bass Knob / Remote Gain No
Built in Crossover High-pass, Low-pass
Cooling Fan No
Color Black
Warranty 3 Years
Recommended Power Wire Gauge 8 Gauge
Overall Height 2.13 inches
Overall Length 8.00 inches
Overall Width 10.75 inches
CEA2006 Compliant No
UPC Code 027242888982
Return period 30 days
Exchange period 30 days
Write Your Own Review
You're reviewing:Sony XM-GS4 700 Watt Class AB 4-Channel Amplifier
Your Rating

Our testing and analysis of the Sony XM-GS4

If you want to get an excellent 4 channel amplifier for your system, I highly suggest you consider the Sony XM-GS4. This 4 channel amplifier not only exceeded its power expectations during our testing, but it’s also fairly compact, efficient and versatile. 

What's inside the box

Inside the box is a high level speaker harness, mounting hardware, 3 year warranty card, installation manual and 4-channel amplifier. 

Amplifier rating

Sony rates the XM-GS4 70 watts RMS x 4 at 4 ohms, 80 watts RMS x 4 at 2 ohms, and 160 watts RMS x 2 at 4 ohms in bridged mode. It is only stable in 4 ohms bridged. 

High-Res audio compatible

The audio quality of the GS4 is excellent, thanks to an ultra-wide frequency range that extends from 10 Hz - 100 kHz. 

Internal crossovers

The dedicated control section is located beneath the top Sony amplifier cover. Simply remove the two screws and you’ll gain access to the subsonic filter, switchable low pass and high pass filters, gain control, and bass boost 

Vehicle integration

The XM-GS4 can operate in 4 channel, 3 channel or 2 channel mode. This amplifier offers excellent flexibility when connecting to your signal source. A simple option is using the two sets of RCA inputs and connecting to the pre-amp outputs of your head unit. Or use the included high level harnesses to connect to the speaker outputs on the wiring harness on your factory stereo, no line output converter needed in situations where your head unit doesn’t have rca pre-amp outputs. For connections the amplifier features two sets of gold plated spade connection terminals for front and rear channels. We recommend 8 gauge power and ground leads, check out  our amplifier installation kits online at qualitymobilevideo.com. Sony also fitted two 30 amp fuses. 


Using a bi-amplification connection, you can assign two channels to bass frequencies and two to high frequencies, minimizing distortion. You can also independently adjust the volume of different frequencies to find the perfect balance for each song.

Installation flexability

The XM-GS4 can be positioned in a number of different places throughout the car. Install it in the front for easy access to controls, or put it in the trunk to save on space.

What's inside the amp

The secret to the power behind this amplifier is what’s inside. We popped it open to take a peek inside and Sony is not messing around. The amplifier has a massive motherboard covering most components, but we did get a glimpse at plenty of transistors. The amplifier features high end components including noise-resistant potentiometers, Schottky-barrier diodes, High-quality electrolytic capacitors and Low flux choke coils. The heavy duty, heat sink integrated aluminum body of this amplifier is designed to prevent external vibrations


The amplifier has compact dimensions of 10-3/4"W x 2-1/8"H x 8"D.

XM-GS4 Amplifier Testing

Two channels driven, 4 ohm, 1 KHz, 14.4v

HP8903B Audio Analyzer: 92.16W RMS per channel, 1.04% distortion and 19.11 volts of output.

AMM-1: 72 Watts

Lumy Voltmeter (Speaker output voltage): 19.17 volts

Current draw: 19.14 amps


Two channels driven, 4 ohm, 40 Hz, 14.4v

HP8903B Audio Analyzer: 85.01W RMS per channel, 1% distortion and 18.37 volts of output.

AMM-1: 76 Watts

Lumy Voltmeter (Speaker output voltage): 19.08 volts

Current draw: 18.42 amps


Two channels driven, 2 ohm, 1 KHz, 14.4v

HP8903B Audio Analyzer: 125W RMS per channel, 1.04% distortion and 15.72 volts of output.

AMM-1: 100 Watts

Lumy Voltmeter (Speaker output voltage): 15.77 volts

Current draw: 31.21 amps


Two channels driven, 2 ohm, 40 Hz, 14.4v

HP8903B Audio Analyzer: 116W RMS per channel, 1.2% distortion and 15.15 volts of output.

AMM-1: 99 Watts

Lumy Voltmeter (Speaker output voltage): 15.2 volts

Current draw: 30.31 amps


Frequency response

Extremely flat and huge frequency response


Very solid Sony! They exceeded their specifications in every test. Throw that on top of their 3 year warranty and you got yourself a solid purchase with the XM-GS4

Customer Questions
No Questions
Have a question? Go ahead and ask anything. We are here to help. Please login to ask a product question.

Car amplifier installation

We show you the complete process of installing a Pioneer Double DIN car stereo in a Chevy truck. The in-depth video shows the installation of the interface, and steering wheel control.

Amplifier Installation basics

Let's start with the basics of adding or installing a car amplifier. First you will need to plan your installation and power wiring, this usually is the most difficult part of the installation for most.

How to choose the proper wire size explained

What size power wire do I need for my amplifier? Well, that depends on the length of the wire and the power consumption of the amplifier. We walk you through how to choose the right gauge wire and wire material depending on your amplifier installation requirements.

How to wire speakers and subwoofers to your new amplifier

In our third video we demonstrate the various ways you can wire speakers and amplifiers to all types of amplifiers. There different ways to do this depending on the type of amplifier you choose to purchase.

What is gain? How do I set it properly?

In our fourth video we demonstrate how to set the gains on your amplifier to prevent damage to your speakers, subwoofers and even possibly your new amplifier. Using a portable oscilloscope we show you how to set your gains.

We found other products you might like!
©2003-2022 Mobile Electronics Display and Accessories Co., Inc.