Amazon.com: Taramps Bass 400 amplifier 400 watts RMS 1 Channel 2 Ohms Monoblock Class D, great for Sub and Bass, Bass Boost, Crossover High/Low Pass, Power technology, Small Amp, White : Everything Else
Roland KC-400 Stereo Mixing Keyboard Amplifier CABLE KIT – Kraft Music
Avantone Pro CLA-400 Studio Reference Amplifier | Sweetwater
PSB-400DSP Subwoofer Amplifier with DSP - 400W – Soundavo
Sundown Audio SALT-400.2 (SALT Series) Car Amplifier 2 Channel 400 Watts RMS x 2Ch
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