I'm trying to get my sound system sorted and I wondered if my car has a seperate amp or crossovers? When wiring a set of mb quart tweeters to the existing tweeter wires the sound is fine. When connected to the wires that power the woofer in the door the sound is worse as it would seem there's no crossover to them. I always thought the xovers were in the tweeter them selves but what I'm hearing says the tweeter wires are being filtered from somewhere . I'm only asking so I can work out if getting a new double din stereo is going to be an easy fit or not.