Bass blockers?

Synack

This setting is sort of on my HU. It gives me the option to send everything under either "Low, Mid, High" Hz settings to the sub. All that did really was give more frquencies to the sub. The speakers started to put out less sound and overall it sounded horrible. So I just put it back to "Low". I think I'll just upgrade Tweeters, shouldn't that at least "help" the problem? If the loudest I listen to my music is 30 and the tweeters start to fudge up at low 20's, don't you think by upgrading to much better tweeters will allow me to run higher volume numbers like towards upper 20's or even 30?

EDIT - Found out that it really is the tweeters. I was on Crutchfield and other websites and I noticed some people complaining about the distortion of the tweeters at higher volume. So can anyone recommend me some tweeters that can handle a very high volume? Just to be safe.

__________________
NO LONGER OWNS A 370
Turbo FR-S