A friend of mine is looking for info/manual for a Kenwood GE-820 graphic equalizer or does someone know what the connections on the rear are? if you need to know anymore info, what he plans to connect to etc I'll ask him and post back.
If you want it to affect all sources, it needs to be hooked up through a tape monitor/loop.
If your amp doesn't have that, then one source gets plugged into the "in", then send the "out" to the amp input...