how many subs does it take...

[cali yaris]

ya thinking of doing the same setup on the opposite side of the hatch? get some quad 8" going on.

That's what I'd like to do, but with some angle, so the subs don't face each other. Doesn't that create a standing wave which cancels a lot of the bass?

[Razr]

Originally Posted by cali yaris

That's what I'd like to do, but with some angle, so the subs don't face each other. Doesn't that create a standing wave which cancels a lot of the bass?

At bass frequencies, no. The speed of sound is 340m/s @ sea level, so the wavelength @ 80Hz is 4.25m, and @ 30Hz is 11.3m - much bigger than the distance between your opposing woofers, so therefore too long for destructive interference within the confines of your trunk.

A simple point in case is the speakers you've got mounted in your front doors - try playing some test tones (or just bass heavy material) and adjust the balance to one side and see if you have more or less bass than when both side are playing :)

This is assuming you've got the speakers wired in correct polarity of course