highs are too high

I have somewhat of an unusual question that I can't seem to find the answer too.

I have a 01' PT Cruiser, I have somewhat of a complex system, by my problem relates to my front and rear speakers.

I have Infinity Kappa's in the back, and an Infinity component set in the front. All 4 are being powered by a JL Audio 300/1, and before the pre-out hits the Amp, it runs through a Audio Control Line Driver. I like somewhat moderate highs, so on my deck I usually keep the high at around -1 or so, and the mids at -7.

I am driving today, and out of nowhere, my highs for whatever reason seemed to get louder. I look at my deck, and the highs are still set on -1, and if I try to turn the highs down, they reduce in volume, but even with the highs at the lowest setting, the highs are still loud. If you go to turn the highs up, they get so high that it's unbelievable. It happens with the back pairs of speakers as well, not just the front. I looked at the my amp, and Audio Control Line Driver, and nothing is abnormal with that. The mids seem to have the same problem as the highs too.

Has anyone had this problem before? What should I do?

Thanks for the responses so far guys.

DYohn, my headunit is a Kenwood KDC-MP925, so it's definately not lower end. All of my equipment is less then 2 years old too.

It's not just the fronts though, it's the rears as well. But, it's not only limited to the highs. The mids seemed to sound different as well. Now when I adjust the mids, they get adjusted a little bit, but there isn't a huge range of adjustments that are able to be made.

It can't be a setting, I wouldn't assume so anyways - being my components have been set the way I like it for the past year, and never get touched.

So being my rears have the same problem, what should I do to pinpoint my problem?

Thanks!

Where do your speaker outputs from the amp run?  If the speakers are tagged behind the deck and you have a factory amplified system, it's possible you blew the factory amp.  I've seen this happen before, and give similar results to what you describe, because the speakers cease producing any low frequencies.  Sometimes people will unknowingly feed their aftermarket amp outputs into the factory amplifier, and wonder why it sounds like garbage.

I'm not saying you did this, but if you had it done by an amateur shop, it's definitely worth checking out.  Everything posted above looks like solid advice as well.