I own this 1997 VW Quantum, which is a version of the VW Passat SW and it has a pair of speaker on the left, driver's side, and another pair on the passenger side. The configuration is mid-range + treble on the door and bass just over the dashboard cover. Considering it has a 4 cylinder 1.8L gasoline engine, it seems to me, the idea was to place all the bass over the cover to mask the engine roar, am I right? If so, it must have a low-pass before the dashboard cover and a high-pass just before the door speaker. In this case, what should be the cutt-off frequency of the filters, because I think the cross-over filter is not deafult as I bought it second-hand, maybe third or fourth-hand. Picture 1 and 2 are random while the others are the actual car.
