3000H solid state head. I built my own speaker cabinet with a 15" speaker. There is no information on the bass speaker except that it is a 4 ohm 400 watt speaker. I have replaced the nine volt battery connector, the cable for the guitar and the cable to the speaker. When I play this bass through my Peavey Practice amp I have no problem. The strange thing is that when I play my friends Yamaha bass with passive pickups through the Behringer amp, there is no problem. I have no idea what is going on. Why does the Jaguar Bass have no problem with the Peavey amp, but with the Berhinger. And why does the Yamaha bass have no problem with the Behringer Amp? Do the active pickups have anything to do with overloading the Behringer Amp? Does the speaker have anything to do with it? Where do I start to try and trouble shoot this problem?