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Whats wrong with my amp!!!? Please help.

So I'm at my band pratice today and a little bit in I noticed that my amp lost all the low end. I have a Peavey TNT combo with a 1'15. If it helps its solid state. At the time i had my little big muff on, I noticed an issue. I heard the highs fine but the lowend did not cut through. I shut the Muff off and the problem continued. We played a song and every one could hear the highs fine but the lowend was just gone. I checked my EQ and that was all in order and I'm worried that I blew an amp. Please help.
 
I had a problem where the amp sounded really distorted and lost its bottom end sometimes. It turned out that a ground connection in the head wasn't being made. A screw was missing. Sometimes it would touch and sound fine, sometimes it was in the air and sounded like crap.
 
I used to play an older tnt, with a 15" in a very loud and heavy metal band. Since it wasn't mine, I would turn to compressor off, remove the grill, and watch that speaker MOOOVE.

anyway, more than once, I had an occurence where the bottom end peaced out. Of course, I was cranking the amp and treating it like the redheaded stepchild it was (the real owner hated it and said if it broke his parents would get him something better :smug:)

But the thing never actually died. That speaker was a rock, lasted me almost six months until i had saved up to buy a stack. Use that compressor, crank the low FQ, and just play through the pain. Peaveys are the only brand who can really take it. :bassist:
 
could also be the big muff though. I had an occurence where i turned on my muff, which was set up for my guitar with the volume cranked. Hit a string, heard a pop and then nothing.

Turns out, the thing fried the 9v in my preamp. whoops!

anyways, those muffs aren't really the nicest things to introduce to your power chain. and like all pedals, you have to really dial it in correctly or you lose all your low end (soundman's curse)

try it without the muff