My Premium sound system is not sounding so premium lately. My car was recently stolen and upon recovery required replacement of the entire electrical wire harness and the woofers (under seat) When I got the car back from the dealer, the bass from the newer and "Better"(compared to my 02') woofers sounded like they were bottoming out when the bass hit. Prior to the work, this system was very strong, had great highs and lots of deep bass. It now sound like it has a grounding issue. When I returned the car for repair (2 weeks ago) the tech said that the bass sounded normal but the cracking sound from the speakers were due to bad speakers. He replaced two. Upon getting the car back, the same cracking and weak sound is heard througout the car. The bass is still pitiful. I can turn the stereo up to the MAX! and it still is not very loud. Because I already experienced the car stereo system prior to the theft and was extremely happy with it, what I am listening to now is unacceptable and definetly not "PREMIUM". Any advice or input on what this could be? Thank you.