I have to disagree with you there. Sound quality has a lot to do with the entire system, if you have one good set of speakers and the rest of the speakers can't handle the power that the good set can, your going to have distortion and far from optimal sound. I've been installing custom audio systems for years. In my 94' I've went through great lengths to get the speakers mounted in ideal locations, I've built custom door panel speaker enclosures that house 5.25" Kicker speakers that sound 1000X better then ANY 4X6 will. A 4X6 speaker is just a poor design all around, if you take a 4X6 speaker from the same manufacture and the same model and compare it to a 5.25" or a 6" that is the same make/model, the 5.25" or 6" will sound much better. What I want to accomplish, and I think many others do like myself, is to have a lot better speaker options that are going to perform way better then any 4X6 speaker will period.
For example we just finished a 3 year frame off restoration of a 100 point 57 Chevy Bel-Air 4DHT, I completely sound deadened the entire interior with Jet Grade sound deadener. And fabricated custom Kick Panels to house 6" Coaxial, and mounted Infinity 6X9's in the rear deck (which was also sound deadened in the trunk as well as the back wall) and that system was powered by an un-amplified Sony Headunit that was also custom hidden mounted. That system (without a woofer) absolutely pounded, and had ZERO distortion at ANY volume.
As far as for rear passengers, personally if I have someone riding in the backseat I'm not going to have my stereo blaring, so that's not even an issue. And the way the speaker enclosures I'm prototyping are designed, is that they will "aim" towards the center console of the truck, just as my door panel speaker enclosures do, so there not firing directly accross from each other. Also there is plenty of "breathing" room for a good set of 6X9"s in the enclosures I'm designing, have you ever hear a 6X9 that was played on a bench or something in an open air enviroment? If you did, you'd know it didn't sound good. Speakers need back preasure on the woofer cone, or else it's going to distort and not sound good. The smaller the air volume of the enclosure the "tighter" the bass will be and vise versa.
How is that any different then having 4 10"s in a blowthrought directly under the passenger, wouldn't that be just as uncomfortable? I guess what I'm saying is that I'm not looking to compete in any competitions, I just want GREAT sound that going to sound like the music is playing the way it was meant to be heard. I'm not trying to be an *******, that's my opinion any how!
