i know, i know, there are lots of these threads already, but i can't find the answer to my question in them...... i saw a concentric EMG pot that is just an active 2 band EQ. does that mean it can be hooked up to passive pickups with passive volume and blend controls? or do the pickups and/or volume/blend have to be active as well? another question....what ARE active pickups? do they have their own batteries? do they amplify the signal before it even gets to the onboard controls? what situation would demand active pickups?