not sure if this is the place for it, but my thread over on CA didnt provide too much help
i have two polk audio mm1040 10" subs. i built a 2.3 cubic foot box tuned to 32hz slot ported box.
according to my calculations it has 31.5 port area. (port is 12" high by 2 5/8 wide)
i looked at the SSA box designs and for a dual ported box for two ssa dcon 10s, they have 28.125 port area.
polk recommended a box that has 27 port area.
on 99.9% of my music its fine as i dont listen to rap, but if i play late night tip, its making some noise for some reason.
someone suggested maybe its mechanical from my subs, they are rated for 700 watts total, im giving ~870. possible, but i dont think so personally. on that song, it takes putting the gain down to almost nothing to get the noise to stop, no way its power or clipping imo.
it is a 128kbps song, thats all i could get my hands on, and all my other music is 320kbps, and no problems with them. perhaps thats what it is.