Boy, I still don't get it. Could somebody please explain speaker/amp impedance in layman terms? I have a Peavey 5150 combo and it says on the back, no less than 16 ohms. The speakers each have a sticker that say 8 ohms. I have a '64 Bassman head which is supposedly at 4 ohms, matched with an avatar cabinet built for this head, and it says 4 ohms on the cab. I want to buy an attenuator, but I'm not buying anything until I understand what the heck I need. When the impedance of a cab is listed, is it per speaker, or for the entire cab? Same for the head--when it says 16 ohms minimum, how do I interpret that? Any help explaining all this would be greatly appreciated. Thanks!