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October 16th, 2011 09:17 PM #11
I think this would be an interesting read: Head Unit Features, And How They Effect YOU: A Guide
Generally, I'm not a fan of amplified subwoofers in a car setup since the bass it produces would be comparable to a good 6 1/2" midbass mounted on a deadened door panel.
As for branded subwoofers that comes with their box (like the mentioned Focal SB30 A1), they're pretty expensive to be practical for most people. I would recommend having your installer fabricate a custom box instead where you can control the air space inside and stuff polyfill to compensate if the box is too small.
Depending on your car, I think the key is to be flexible on where to position your subwoofer. There's no rule that subwoofers should always be at the back. In fact, if you're in a position (and you like to) to mount the subwoofer at front, I would recommend that for SQ applications since you get the "bass up front" sensation. That's possibly one of the hardest things to get right in tuning. Where can you mount them? I've seen them mounted in gloveboxes (Reo's Altis -- EMMA Advanced 7channel champion), in the passenger footwell (Norbert's City -- EMMA Advanced Unlimited 2nd place), etc.
A 70/30 water to coolant mix may improve cooling efficiency but that's at the cost of less...
Coolant...