for those who dont have time delay or advance phasing adjustments, heres a tip.
Run your front stage with an 18db high pass crossover using caps and coils avilable from jaycar, anywhere from 70-85hz would be good, depending how good ur splits are.
wanna know why?
There is a path difference of about 3 metres between the sub and front stage, and the length of a 70-85hz wave is between 4 and 5 metres. SO the front speakers will be close 270degrees out of phase with the subs. By changing the polarity of the speakeryou can only go betwee0 180 and 360degrees out of phase.
so how does 18db crossovers help?
18db crossovers change the phasing of the speakers negative 90degree, so if you wire the subs to 360degrees phase with the sub the 90degree phase shift makes teh front stage 270degrees out of phase with the sub. As the front speakers due to the path difference of 270degree's also, there will be far greater constructive interfearance at the crossover frequency.
so whats this do? the midbass at the crossover frequency will improve, noticeably making the bass appear tigher and cleaner.
SO now the poor peopel can overcome the problem of awkward phasing.
*edit* this applies to all big large sedans that are either rearloading or firing directly into the cabin. I dunno the path difference of a hatch rear loading, i think it would be exactly 180degree delay.
Sedan rearloading, 270dgeree delay.
Sedan firing forward, 90degree delay
Hatch rear laoding would be inbetween so 180degree delay
laters
[ December 11, 2002, 14:46: Message edited by: Maz ]