I'm thinking about using two 8 inch subs as midbass in my rear deck in an infite baffle. Where would I set my crossover's. Is 100hz 18db/octave HP too high? I've also got 2 12" subs in the trunk, is that gonna screw up the 8's in the rear deck? Thanks

Are you running the mids that will play with the 8s in the front of the car, or in the rear deck next to the 8s?

in da front.

I see to possible problems with this.

1.) I've found energy above 60hz to be directional in a car. Your imaging will be pretty messed up in the front, and it will sound a bit "off".

2.) Your 8s when run IB in the rear deck will absorb a lot of the energy being created by your 12s.

If you are determined to run the 8s in the deck, build a box for them. If you want to improve the SQ of the car, run the 8's in your doors with the mids in the kick area.

Adam

Put your midbass up front. I would use 6's as well. The 6's are faster and that is what we want from midbass, not excursion. The 6's will also have better dispersion in higher frequencies than the 8's. Run them from 70 or 80htz up to about 350htz. It is amazing how loud and clear mids can get when they only go down to 350htz. Since our ears are more sensitive in the midrange, your system will hit harder and be much louder.

6's aren't 'faster'. A 6 will play a 100Hz note as 100Hz, and an 8 will play a 100Hz note as 100Hz note. It's just that the 6 as a general rule will start to roll off audible frequency higher than 8's.

Are 8" subs able to play mid-bass with no trouble? I've heard differen things in the past.

Why do you think I'm putting 8's up front, Zach?

Depends on the sub.. There are some 8"s that i wouldnt use as midbass..

^Yes, I agree. Err, subs actually should not be used for in-door enclosures. A sub with high xmax would not only be inefficient and require a lot of power, but it would be running the wrong frequency band. All that's needed is a midbass driver with no more than 5mm xmax for 50-100Hz response.

It also has to do with the doors. Leaky doors are no fun, and they actually do have quite a bit of airspace, so lower frequencies may come through easier than midbass (70-200). That's what I find anyways.