DESC: four channel amplification 4x75 wattstotal output @ 4 ohms variable gain control/remote turn on/off 4 ohm speaker impedance built-in bass and treble control gold plated rca low level inputs s/n ratio: greater than 85db frequency response: 15-30k hz overload/thermal/short circuit protection power on led indicator automotive type fuse protection dimensions: 9.05 w x 2.32 h x 10.63 d