i agree with mike, far too many people seems to rely on the "prefabricated" vented box and then are surprised when it performs poorly. many times vented boxes are purposely tuned badly to gain output, but a well desingned vented box with a woofer meant for a vented box are the best sounding boxes i have ever heard. many times i think people confuse quantity with quality, eli, im not sure how the relationship of a vented box in a car mimics that of a t-line, further explenation required.