So I have an odd issue with my amp and cab. I have a rumble 500 head and a 4 ohm Acme Low B2 generation 2 cab. I recently purchased several inexpensive speaker cables (marketed as speaker cables, not instrument cables). When I use any of them to connect my amp to my cab I get a rhythmic loud popping noise. It's like some kind of failsafe on the amp is kicking in and turning it off, but the switch is on, so it turns on again, ad nauseum. I attempted to trouble shoot by plugging my amp into different speakers and didn't have any problems with the amp, so I assume it's the cab or the cable. Thinking it was perhaps from the cheap cables I bought a much more expensive speaker cable from my local music store. I have the same issue with it. It too is marketed as a speaker cable and not as an instrument cable. Finally I tried a cable I made myself using two stranded speaker wire that I soldiered 1/4 plugs onto. It works with this cable fine. Anyone have an idea for why it works with the cable I made myself and not with the cheap or expensive speaker cables I bought?