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DS18 EXL-P800X4 – 4 Channels Class A/B Car Amplifier – 400 Watts RMS 4-Ohms Bridged – Made in Korea
PrimaLuna EVO 400 Tube Integrated Amp – Upscale Audio
Taramps TS400x4 4-Channel Car Amplifier 400 Watts @ 2-Ohms2 Ohms 4 Cha
Mb Quart Fa2-400.4 Formula 400 Watt Amplifier 4-channel Car Audio Amplifier : Target
Crown Com-Tech 400 Two-Channel Power Amplifier • Available from ChurchGear
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BOSS Audio Systems OX4.400 4 Onyx Series Car Amplifier – 1600 High Output, 4 Channel, Class A/B, Low/High Level Inputs, Low Pass Crossover, Bass, Full Range, Bridgeable, For Subwoofer