I've got this Ampeg B25B cabinet with two 15-inch speakers in it. I bought it used in 1977 but it's sat unused in my basement for 20 years. I'm dragging it to my practice place tomorrow night, but in re-examining it I've got some questions. When I got it, it had an XLR female input hole plugged with wood filler and an ordinary 1/4-inch phone plug receptacle installed. The plate says 16 ohms, so I opened it up and rewired it for 4 as my V4B has a 4 ohm setting. But what I know about electronics you could write on the back of a postage stamp, so I don't know if I did it right. My trusted friend/sound man with the P.A. will figure that out. When I bought that cab in 1977 I was told it had been a P.A. cab. Did Ampeg make P.A. gear? I'm just wondering if the B25B was in fact a bass guitar amp cab to start with. Designated a B25 B, you would think so.