A couple of weeks ago, I installed new stuff on my TT coupe. This includes Focal K2 Power 165KP 6,5" components in the front panels which can handle 80W RMS, an MTX Thunder 4500 12" sub (pretty good and loud for my taste), a 5ch. SPL dynamics amplifier which produces 4x75W RMS + 1x150W RMS for the sub) according to its site (supposed to be a very capable 5ch. amp), a set of Hertz tweeters at the rear over the panels externally mounted and a set of Ultimate Titanium 6,5" component speakers at the rear, which are supposed to handle about 65W RMS and had them from my previous car. I also replaced the HU with a Becker Monza MP3. Anyway, I have never owned a car with a good audio system before, so I can only compare the current one to the one in my previous Golf which only had a Blau HU, these Ultimate comp. speakers, a set of Kenwood 6"x9" co-axials which could handle 320W max. power (very very impressive, loud and clear speakers) and a simple 4x100W max amp.

The problem is that I feel that the sound is noticeably louder than that of the previous setup, but not as clear... As a matter of fact, I have a strange taste when it comes to car audio: I like listening to the high frequencies very loud (the vocals etc.) Maybe the sub is "covering" those frequencies but I already lowered it. I have also noticed that somehow the high frequencies are a little "delayed" some times.

I have started to believe that it's those rear speakers that restrict the system's performance compared to the Kenwoods I had previously. Do you think this is the problem or is it just because of the amp's adjustments? Could it be something else? Thanks in advance for every opinion.

the bass shouldn't "cover up" the higher frequencies, unless its waay waay too loud. It sounds like your amplifier settings are off, or something else is restricting your high frequencies. check the crossovers on the amp and make sure your head unit doesnt have a built in crossover that is filtering out those high frequencies.

Does your head unit have time correction for the channels? "time correction" is the intentional delay (in tenths of a second) of signal to your speakers in order to ensure that the sound from all speakers (at varying distances from the listener) arrive at the listener, at the same time. for example, by delaying the speaker closest to you (front left driver side), it allows the sound generated by the speaker furthest from you (rear right, passenger side), to reach you at the same time. when setup correctly, time correction can control and place the audio "sweet spot" where ever the listener is. when setup in correctly, frequencies will sound delayed and late. if there is a reset for your headunit, they usually default to something that should be okay. if you have more discriminating taste, most audio shops are willing to tune an existing system for a nominal fee. also, there are external sound processors that will do time correction if your head unit does not already have it...

I really don't know if it has that time correction thing. But it's not included in the specs sheet. Anyway, since I have a number of small problems, I guess I'd be better of if I took it to a sound shop close to me which I know that is top quality and make all the necessairy adjustments. That would solve my problems once and for all, right?