rattly practice amp help

[pal1972]

OK so ive got a crappy old fender frontman 15B practice amp!!! i dont use it much but occassionally at home to practice, it rattles!!!! i thought it was just due to the extremely crappy speaker, so i had an old eminence beta 8" driver lying about so i finally swapped them over tonight to see if it helped.... NOPE!!! i'd just like to be able to crank it up a bit without the annoying rattles and i know the beta is way over powered for the amp itslef!! is it cos its a sealed little box?? would putting port holes in the rear help??? or is it cos its probably not air tight??? not a major dilema but i aint got any spare cash to buy a small practice combo (unless anyone can suggest a VERY good practice amp??!!)

[The_D]

I used to have an old peavey combo practice amp and the amp section had come loose causing a rattle.

Pop the back off and check all the mounting screws holding the amp into the cab.