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The Sony® GS-400 Class-D subwoofer amplifier affords incredible installation 

flexibility thanks to its compact size and packs quite a punch.  GS series 

amplifiers offer tremendous value including convenience features such as: 

modern cosmetics, variable cross-overs, multiple channel configurations 

and singe-side electrical connections to suit almost any application.

Amp Design

The XM-GS400's 4/3/2 channel configurable output, compact chassis size and single sided 

connections provide multiple mounting options while maximizing output and control for your 

audio system. 

4 Channel Stereo Output

The XM-GS400 delivers 70 watts RMS per channel at 4 ohm at 14.4 volts, from 20 Hz - 20 kHz with 

less than 1% THD+N.  At 2 ohms stereo, the XM-GS400 delivers 80 watts RMS per channel at 14.4 

volts, from 20 Hz - 20 kHz with less than 1% THD+N.

2 Channel Mono Output

The XM-GS400 delivers 160 watts RMS per channel when front and rear channels are bridged into 

4 ohm with 14.4 volts, from 20 Hz - 20 kHz with less than 1% THD+N.  This unit has a mximum output 

power of 350 watts per channel when bridged at 4 ohm.

Built-in Crossovers 

The XM-GS400 has a removable top panel that conceals indepentent front and rear 12 dB/

octave variable HPF (High Pass filter) and LPF (Low-Pass filter) crossovers at 50-300Hz.  This unit also 

provides independent front and rear 12 dB/octave sub-sonic  HPF (High-Pass filter) crossovers, 

variable at 6-70Hz to maximize your systems potential.  This amplifier also offers independent, 

variable 0-10 dB 40 Hz bass boost circuit to increase low frequency response. 

Input Flexibilty 

As well as traditional RCA inputs, the XM-GS400 offers direct connections (High Level Input) to 

the speaker output of your car audio unit if it is not equipped with RCA line outputs.  The auto 

sensing, high level input feature also allows the amplifier to be powered up without the need for 

remote power turn on connections.

Warranty

The XM-GS400 includes a 3 year warranty.

Specifications

Amplifier Section

Max power output

700W max power

Power Ad Hoc

70W per channel at 4 Ohms from 20Hz-20kHz with  1% THD

1

 

Speaker Impedance

2-8 Ohm stereo

4-8 Ohms mono

Audio

Band

Low Pass Filter: 50-300 HZ, -12dB/oct

High Pass Filter: 50-300 HZ, -12dB/oct

Circuit System

OTL Output Transformerless Circuit Pulse Power Supply

Frequency Response

10-100kHz (+0/-3 dB)

Harmonic Distortion

0.05% (1kHz)

Impedance

2-8 Ohm stereo

4-8 Ohms mono

Input Level

0.3 - 6.0V (RCA input) 

1.2 - 12.0V (High Level Input)

Low Boost

0-10dB (40Hz)

XM-GS400

GS series 4/3/2 Channel Amplifier

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