I haven't heard of any way you can "cheat" on an enclosure size just by putting two woofers into a shared space. If you put two woofers into a 1.5 ft^3 space, it would be the same as putting a single woofer into a 0.75 ft^3 space, response- and performance-wise.
However, if you really need the extra space, you could build a 1.75 ft^3 box for two woofers and heavily stuff it with polyfill. I've never used Audiobahn woofers before, so I don't know what the stuffing requirements for the recommendeded boxes are, and therefore don't know if it would be feasible to put "extra" stuffing into a smaller-than-optimal enclosure. Everyone on this forum seems to recommend not using shared spaces for woofers anyway (for the reasons you stated in your amp questions, among others). Instead, divide your enclosure into two chambers with a piece of MDF. This would be like having two enclosures with a common wall, and will save a little bit of space in the trunk versus having two seperate enclosures.
As for hooking your speakers to your amp, you can either run them in stereo, like you mentioned in the first part of your amp question, or run them bridged like this:
- Connect the coils on each sub in parallel
- Connect the subs in series
This will give you a nice 4-ohm load for your 4-ohm bridged amp. It shouldn't make a difference which way you connect your speakers if you put them into seperate enclosure spaces, and your amp may last a little longer if you run it in stereo (in theory, anyway).
Hope this helps,
Ben
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