American Bass Was On Pursuit To Design A Line Of Amplifiers That Were Capable Of Fitting Into Some Of The Most Confined Spaces. We have designed Phantom Series amplifiers that are capable of high power output with high efficiency and difficult loads. American bass completed the mission with 5 models that are reliable and modestly priced. Integrated with modern technology, the Phantom Series amplifiers are one of the most dependable products on the market. The American Bass PH4100 is a good amplifier for a mid-level upgrade of a 4-channel system.