WHY do you say that????//content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif
my buddy lives in india, all the quality stuff he mentioned for was extremely overpriced due to being placed on special order which is shipped from outside the country. In the US audio sound quality and SPL is pretty advanced. The gear we are used to for example a head unit, we have at least 13 bands of EQ, time alignment, active crossovers, quality 24 bit digital audio convertors.
as for your setup. I would not touch that head unit with a 10 foot pole. Weak EQ, no time alignment, no high pass filter weak pre-out voltage signal, low quality 16 bit DAC. All this just means poor sound quality from the start with no way to improve or tweak it. Not to mention sony is bottom end of the car audio world. Only things that arent trash is their 1500 dollar audiophile head unit and their 200 dollar mex 100bt head unit and their sony GS lines of speakers.
For speakers, you have way too much going on and you are relying on head unit power which will just sound like garbage when you turn it up. Why? because lack of power will cause speakers to distort when you turn the volume up along with not bringing out any potential the speaker has for any good sound quality.
Rather than having 4 + two (tweeters) underpowered drivers, focus on the front, use that 4 channel amp to power the tweeter and the front speaker. with the money you save from not spending on rear speaker and tweeters(which are absolutely useless) you can get either a better head unit or a dedicated subwoofer amp because that 4 channel is not going to come close to tickling that sub not to mention you can only bridge one pair of channels on that 4 channel for sub duty, however your subwoofer is a ported enclosure and you would want a subsonic filter to protect the sub on low frequencies especially when it cant play any lower than 29hz as manufacturer stated.
Why no rear? simple when you go to a concert, you dont turn your back to the performer, you look right at them. A properly done Front stage will be more than loud enough to be heard several football fields away. Not to mention have A LOT better sound quality from having a proper Soundstage. What is that you ask? Its when you can literally see the artist/band on your car's dash through sound. You can tell where the guitar is, where the singer is while the drum is right behind them sweeping across your dash. You arent listening to music anymore, you are really lost in another world. In order to achieve this, you need a quality head unit and a proper install. Any rear speakers will destroy this illusion by pulling the sound back behind you and soundstage is fked.
How to make your setup work better for the same budget...
Get a pair of quality component speakers
A head unit like a kenwood kdc x301
Use your 4 channel amp's channel 1 and 2 to power the front components and use channel 3 and 4 to power the subwoofer.
Sound treat your doors along with finding the best location to mount the tweeter SOUNDWISE not convenience wise.
Time align, crossover and tune the setup properly, you'll be 1000x happier than the mess you were thinking about.
If you really want rears, keep the stock speakers put them on head unit power. But everything else will drown the rears out. Even the passengers will hear the front loud and clear over the rears, if you can hear it football fields away, passengers will hear it just fine.