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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
Avantone Pro CLA-400 Studio Reference Amplifier CLA400 B&H Photo
DS18 EXL-P800X4 – 4 Channels Class A/B Car Amplifier – 400 Watts RMS 4-Ohms Bridged – Made in Korea
the t.amp E-400 – Thomann United States
MUD Series 400-Watt 4-Channel Full Range Class D All Weather Powersports Amplifier | MTX - Serious About Sound®
Phase Linear Model 400 Series II, Audio Standard Amplifier - SOLD – Holt Hill Audio
Phase Linear 400 Power Amplifier/Local pickup only | eBay