Fischer Amps Shaker Amp 400, Power Amplifier, Especially for the operation of a Butt Kicker Concert or two Butt Kicker LFE with a power of 500 W at 4 Ohm, Mic preamp with switchable 48V phantom power and -16 dB pad switch, Parallel out to loop the input signal, Active crossover (lowpass adjustable from 40 to 200 Hz / 12 dB / oct) and a switchable high-pass at 20 Hz, Power output: 500 W @ 4 Ohm, Dimensions (W x H x D): 483 x 44 x 195 mm, Format: 19