Since I have more time than money right now, I am still thinking about doing two 6-8in subs in my backdoors of my mazdaspeed3 to compliment the 7" components I will put in front that play down to 50-60hz. All I would need these drivers to do is play sub 60hz with as linear freq response as possible. I was thinking putting them in a door would be an infinite baffle situation, but is this the same as free air configuration? I don't know if those 2 terms have the same meaning. I know IB needs to have the front and back of the driver completely isolated to reduce cancellations, and you still need to figure out a manifold design for best sq. There would be no box in the door, and I think isolating the front and back of a driver would be difficult with the thin material covering the door. Is this even worth looking into or will it sound horrible? Is my best bet for sq to build a 10" in a sealed box in the spare tire well? Thanks for any information you have.
