Someone's probably going to tell me that this is a bad idea, but...

[Ged]

A wild idea for a DIY project popped into my head (on the other hand, maybe this will be "been there, done that" for some of you). I drive a '96 Mazda B2300 (reg cab). For the past twenty years or so, one of the most common solutions for getting more bass in the space constraints of the average small pickup has been to stick a 6" Bazooka tube behind the bench seat. I don't think I've ever seen a bad review from anyone who has gone this route (although I've heard some grumblings from audiophile purists who disdain them).

Anyway, I'm thinking about what DIY alternatives might be possible. One thing I was wondering about was what setup would be possible just using the sub output from the head unit (Pioneer DEH-P5200HD). The receiver is advertised as outputing 50Wx4ch (commonly said to actually be about 22Wx4ch). The manual claims that when the subwoofer output is turned on, the receiver bridges the two rear channels to make 70Wx1ch into 2 ohms (I'm not sure what the actual output is).

I started looking into what you could do with that, and one of the things I came up with was making a box that would hold four 8 ohm woofers or two 4 ohm woofers (5.25" or 6.5") wired in parallel and using at least two 5.25"/6.5" passive radiators per woofer. One of the combos I'm thinking about is Peerless' SDS-830656/SDS-830657 with their SDS-830880.

Any thoughts on feasability or sound quality issues?