Alright I've got two polk Db 12s each in a perfectly built wedge shaped box giving each sub .88 ft^3 I think. the subs are on about a 40 degree angle firing upwards. (The box was originally built for a Ford Mustang). The subs get slightly more than 400 watts rms each. anyways, I just bought a Dodge Avenger, and with the seats down and the subs placed right against them firing diagonally upwards into the main cabin, The low frequencies (under about 45 hz I figure) just are not there. the sound drops from ridiculously clear, loud bass to almost nothing whenever it drops into the really low stuff.
Anyways, I pulled the sub box back about half a foot so the subs fired up towards the top of the trunk (where the 6x9s are located in the rear deck) and the subs sound perfect, with a very loud, even, extended response down to 20hz.
Anyways my question. Is there anyway I can solve this problem? I want my subs as far up in my trunk as possible to give me as much room as I can (for my amps). Would changing my box to a more traditional rectangular prism shape allow me to place them right up against the seats without a loss of low low frequency output?
I'm a novice with car acoustics and woofer placement so any help would be much appreciated. Thanks