Originally Posted by Vipercussionist
Just a guestimate, but I think the speaker's spider is ripped or just stretched.
The spider is the part of the speaker that acts like a shock absorber, if it's weak, the speaker cone won't stay tight with a lot of low end and will likely do what you're describing.
Most respect the badge, but all fear the drum.
I hooked up another speaker my dad had in a speaker cab he built to this amp...not sure what the wattage was but i had the same issue...unless this speaker had the same problem then i dont think this is it....but at this point i am sure of nothing