sealed boxes, cars

[theChris]

ok, i once read a passage about high Qtc designs sounding good in some high end home systems. in any case i was wondering what you would look for in determining if a woofer in a sealed box would sound good? i assume a health amount of Xmax would be needed for the lowest bass, but what else really suggests a good woofer?

for my next car, i wanted to compete in SQ competitions for fun, and i may win, or have fun, or both. in any case i kinda wanted to do a themed setup, and noticed Dayton Loudspeakers make lots of woofers for home/car useage. i wondered about the dayton titanic which has a high Vas of 280 L. i was wondering if i get a small car if i shouldn't just put 2 in my trunk in an infinate baffel configuration. i would seal off the back of the trunk and all. since i don't have a car yet i can't really make a solid design, more of an idea.

but if the woofer is put in a sealed box that is smaller, the Qtc goes up, and i've been told that is bad.

 

[Circlotron]

If you completely seal off the trunk from the cabin then the car ventilation will be very poor because most cars have the cabin ventilation air exit into the trunk and then out to the atmosphere. Back in the late 70's I had a '64 Pontiac Parisienne (like this one if anyone cares http://www.geocities.com/qldpontiac/Members/RAnforth64.html ) with a propane tank in the trunk and in those days the regulations required you to completely seal off the trunk from the cabin. It was a real pain and if you wanted to have the heater going you had to open one of the back windows a bit otherwise hardly any hot air came out.

The car had excellent pose value but was pretty crook otherwise.