EQ IN/OUT jacks let you add an external equalizer or reverb unit. I have tested this unit by feeding a signal into the AUX input and connecting a speaker to it. As you can see/hear in the video it does work and sounds good.
Item Tag: Radio Shack MPA-95
-
Radio Shack MPA-95 100 Watt Mono PA Amplifier, Serviced – 4 Mic 1 Aux 1 Phono
All Mic, Aux and Phono inputs checked working. Protection circuit checked working. Nice sounding amp.