TXSpeedDemon

Someone mentioned Infinity speakers - is that what you have?

I have Infinity Kappa Perfects and mine sounded the same way at first. It's not so much that the woofers are underpowered, it is that the tweeters are really bright. I fixed this by myself by first rewiring the woofers with 12 gauge wiring. Before that I had 16 gauge wire and when I had it up too loud I would get some clipping on my Boston Acoustics amp. I then disconnected the tweeters and subwoofers in the trunk and adjusted the amp settings with just the door speakers. This way i knew the door speakers were actually putting out the full sound i wanted. Enough bass I could feel it in my legs with the volume up pretty high.

I then hooked up the tweeters and did some more fine tuning. The tweeters were still really bright and overpowered the woofers again. Setting the passive crossovers to 0 or -5 helped a lot. If you're on the stock stereo then the -5 setting would probably be your best bet. If you're willing to buy an active crossover you'd probably be able to get the exact sound you want. I set mine at 0 then used some of the adjustments on my Eclipse head unit to get the fuller sound I wanted.

After all that I got it sounding really good. The tweeters are still a little too loud without my subwoofers for my taste. If you're still finding them be too bright after the shop looks at them I would suggest pulling off the covers, removing the tweeters and disconnecting them. If you're using Infinity Kappas I bet you'll find the woofers actually sound good and you only need to replace the tweeters or make some of the adjustments I suggested above.

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Thought about this more... probably a lot easier to disconnect the tweeters at the croosover to test and tune your woofers and make sure they aren't out of phase.