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I had the dealer install the subwoofer when I bought My 1LS, along with the PDIM. After the installation I was not impressed with the sound, seemed like not much more base than before. Then a few days later I pulled the box loose to try and fit the rubber trunk mat under it. No joy, I had to cut the mat to fit around the sub.
Anyway, I found that the front mount bolts were too short, and not engaged in the threads in the inserts. The bolts were 30mm long. I replaced them with 40mm bolts, which tightened the sub against the car frame and vastly improved the sound. Any music with heavy base now makes the car vibrate like I'm in an earthquake. People in the back seat always complain about the vibration. I have the amp on the sub box turned almost all the way up, and usually set the head unit at -4 treble, -3 mid, +4 base. I have 30% high frequency hearing lose, and still find the stereo has too much high freqs that hurt my ears with it set any higher. I almost always listen to mp3s through the PDIM, because the sound quality of the radio stations sucks.
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