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Bass Cab buzz

Well, I'll let you know what I have first. SWR Workingman's 4x10 cab with the Workingman's "2004" head. Bass doesn't matter, because the buzz exists before I plug anything in.

I turn the power to the amp on. All is good. I flick the switch to turn the speaker on and I get a mid range buzz. It gets louder as I turn the volume knob up. If I plug a cord into the main bass input I get lots of popping and snapping (even if I switch the cord to "shorted out"). If I wiggle the cord even a little bit in the jack there's tons of popping and cracking and the buzz either gets worse or a little better depending on which direction I move it.

Here's what I've tried to no avail:
1) Taking the head apart and checking for loose connections on all of the input jacks
2) Took the grill off and tightened up the speakers
3) The tweeter control on the back of the cab has come apart so I took off the back panel and re assembled. Didn't fix the buzz, though.

I'm open for ideas. I would ideally like to be able to fix this myself, but will take it to a pro if necessary.

Thanks for any and all input.
 
Id say unless you have a fair understanding of electronics, take it to a tech. It sounds like its either got grounding issue, which could be a result of coupling capacitors of the power supply.
 
I managed to fix it! Thanks for the replies, but after fiddling with it for about an hour I isolated the problem.

After much trial and learning how the thing is put together I came back to the bass input jack. Touched some of the wires and found the one that interfered with the buzz. Turned out there were 2 wires running into the jack that were touching and weren't supposed to be. I just moved one of the wires up and away and WA LA! Buzz completely gone.