Hi, Im normally on other DIY audio boards since Im a chip amp / home theater guy, but I just got an 06 Mazda3s GT zoom zoom
For SQ emphasis that can reach reasonable volume levels, Id first lose the rear speakers and definitely lose the stock receiver. Had there been a pre/pro only receiver for ~$250 Id have gone for that, but since I could only find an Alpine CDA-9851 for $250, that will have to do.
Im not that picky about amps since the sound quality between brands isnt as noticeable as the difference between speakers. 75W rms is more than enough for these custom speakers and 250W rms is perfect for the Sub I picked.
The buyout EXW12 woofer has been for sale for over a year and it once retailed for $350. It has a low inductance (Le: 0.75 mH) which means it probably sounds really nice; I just wouldnt expect to hit 125db with it
As for the Speakers, I decided to custom build them using some quality drivers with a crossover that doesnt use cheap electrolyte caps. The sound quality from capacitors is definitely noticeable from my speaker building experience. The right crossover and driver choice will really make a speaker perform well beyond the mainstream component systems. As for how the drivers will sound and whether or not you can seal or port the door Thats a different story, and Ill leave that up to the skill part of the install.
Maybe if you had enough time you could seal the door and use a software program to model your speaker design with the volume of your door, and then port it with flared ports hehe
As for the wiring, I have done enough testing where Ive found its virtually impossible to tell the difference between brands of speaker wire COAX would probably be my choice if I had a little more budget for the ICs and wiring and Id definitely build my own ICs and use decent interconnects that cost around $1ea, but since PE (parts express) sells those amp kits, Id say thats as cheap as it gets for all that wiring and interconnect stuff.
Anyways:
http://www.crutchfield.com/
Receiver = Alpine CDA-9851 = $250
http://www.acoustic-visions.com/
Adire Audio Extremis Extremis 6.8 (Woofer) $100 x 2 = $200
This is a high end woofer that will excel in SQ and SPL (13mm one-way xmax!)
http://www.partsexpress.com/
Speaker and Sub Wiring Kits: AMPLIFIER INSTALLATION KIT 8 GA. = $15.80 x 2 = $31.60 (everything to wire 2 amps)
Speaker AMP: PHOENIX GOLD R4.0:2 2x75W RMS 4 Ohm OCTANE-R AMPLIFIER = $131.94
Subwoofer AMP: PHOENIX GOLD R4.0:2 250w RMS x 1 (bridged mono, 4 ohm) = $131.94
Subwoofer: SOUNDSTREAM EXW12 12" SUBWOOFER 4 OHM fed 250W RMS = $140
Tweeter: PEERLESS 811435 1" NEODYMIUM DOME TWEETER - $18.50x2 = $37
Crossover: Pre-built 2-WAY CROSSOVER @ 4000 Hz $0.98x2 = $2 (replace 8 uF capacitor with a DAYTON DMPC-8.2 8.2uF-250V POLYPROPYLENE CAPACITOR for 2x$2.74 = $5.48)
12 generic Subwoofer MDF box. - $50 (see above posts)
(If you have a little wood skills, a table saw, a jig saw (for circle) and wood glue, this box can be made yourself for $20 in materials.)
I recommend adjusting the crossover points for the high pass and low pass and then swapping resistors to level match the drivers (especially if the tweeters are closer mounted to the ears). The cost for crossover modification parts is marginal since non-inductive resistors are 50 cents and good quality capacitors are in the $2-5 range.
Total Cost $979 Most of these items have free shipping but not all of it so Id say the budget would be +/- $50
It also depends if you have all the TOOLS:
Heat shrink, 2% silver solder, a soldering iron, etc
For this system The crossover design is really going to make or break it
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