JVC 4VR-5456X quadraphonic receiver. All 4 channels work as well as the front and rear 5 band EQ's. 50 watts RMS per channel in 4 channel mode , 100 watts RMS per channel in bridged stereo mode (BTL).Phono input and tuner input tested , I didn't have a tape deck or 4 channel device to test those inputs. Since this is a used piece of electronic equipment it is sold as is. This receiver weighs 44 lbs. (20 kilos).