Okay so here goes,
I have a 2004 Jetta. Installed in the Jetta are two sets of Polk DXi 6500 components, all installed in factory locations. Tweeters are mounted up near the mirrors in the front doors, and rear are near the door handles for those of you who aren't familiar with the way these cars are set up speaker wise.
I have a DEH-80PRS source unit, halfway decent RCA cables (a cable is a cable, they're twisted pair, non shielded to avoid RF) and a Nakamichi PA-1004 running these components. Heck of an amp, originally designed and built for Nakamichi by Stephen Mantz of Zed Audio.
Back to the issue,
I did some research and found these sets have a 2nd order butterworth crossover design, and there's a common understanding that these designs yield a 180 degree phase shift in the tweeter output. so after the first round of not being happy with their sound and tinkering, i tried it, flipped the polarity of the tweets, and it made a difference. everything sounds much more in line as far as timing goes, but it's still not perfect.
I'm having a hard time getting these to sound good enough for me to be happy. And I'm wanting to blame it on the fact that I have no deadening in the doors right now (weather got cold and nasty before I could install it) but I'm still not certain that's the issue.
Up to about half volume, they sound pretty darn good. after that, they seem to get kinda muddy sounding, especially in the vocal range.
I intend on installing CLD on both the inner and outer(on the inside duh) door skins, and experimenting with a deflex pad(or similar) and/or possibly egg carton foam behind them. But as I said, weather is kinda crappy now, no garage.
I know the dampening will help ANY component set I put in the doors, but I'm just not certain these polks are really what I'm after (i bought them after reading TONS of high rated reviews on multiple websites) A friend of mine has a set of Infinity Kappa components(not the Kappa Perfect line either) in his front doors with no deadening and tweets in the dash aimed up at the windshield (different vehicle with different door structure as well) and they sound much more detailed and accurate to me than I can ever seem to make my Polks sound.
I used the "Auto EQ" to get the curve real close, and manually tweaked for midrange by ear, ended up pulling 3db out of 315Hz and 1-2db of the immediately surrounding frequencies on the EQ. that "helped" take some of the issue out, but it's still not right.
I have a ECM8000 mic, ART USB Dual Pre, and software with an RTA that I'm planning on setting up in the car once I get some time, but I'm not certain that will solve it all either.
I guess what I'm looking for here is, Is deadening my doors PROPERLY going to make enough difference that I will finally be happy with these components (they sounded great free air in my house, and in the wall at the store) or should I seek other components anyway. and if so, can anyone recommend me something that's going to give me the range, and detail that I'm looking for on a non SQ competitor budget (200 per set or less).
I was looking at sets like the Pioneer TS-D1720C (these seem to be pretty stellar for the money from what I read from owners as well as specs) and also heard great things about the Morel Maximo 6 series. Both are in my price range(more so the Pioneers at 100 a set), But I'm not the type to gamble.
Thanks in advance, and sorry for the long post.