This is a used / pre-loved item, we do our best to uphold the quality of all our used equipment.Hello, we sell a KS audio Ca4S power amplifier from our inventory into which a Firmod2Controller is installed. It is a 4 channel power amplifier. CH1+3 have 500W, CH 2+4 have 250W. Various programs for KS systems can be invited via the Firmod2 controller. Or you run the amp as a normal 4 channel amp for all possible boxing systems via the "default program". A program card as desired is included in the purchase price. In the photo the second from above. If you have any questions. I would like to sell both amps at once.