I just bought a Ampeg SVT 350 that appears to be a older head connected to a Ampeg 2x15 cab and im playing on a Active fender bass and any time I play it clips. I took it to a friend and we tried a couple of basses out on it and all were active and all appeared to be clipping but then when we plugged in a Passive bass and it sounded fine. My question is that can a old Ampeg possibly not be able to handle a active? It even clips with the pad button pushed in. Any advice?