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Problem playing 5 trough a 1x15?

I play through a Ampeg BA115. I have had this amp since christmas and its been giving me great tones and enough power for everything. I got a 5 string about a month ago and today I'm having the amp distort and rattle and cut in and out. Any one have an idea ? I've praticed with it in my room at 2 and play a drum machine through it, but the manual says the amp can play cds and aux equiment. I don't turn the drum machine up at all. Please help
 
Went throught 3 different cables and checked both jacks between my active 5 and my 4 string Ibanez(passive) My parents got some extened warranty from GC soo i'll bring there this weekend. I took off the front, the grill cover and the speaker isn't moving different must be something internal.