OK so i don't have a WRX, but I just bought the next best thing, a 2000 2.5 RS Coupe. Its awesome, but the sound system is awful. I promptly installed my Alpine CDA-9835 deck so I could at least listen to my ipod, but I am planning on upgrading the rest of the system now. I have a box with 2 10" alpine subs and hooked up to a mono amp from my previous car (it was hit and totaled by some woman on her cell phone ). I read up on amplifiers and didn't realize just how much a difference they made in sound quality so I decided to get a 4 channel amp to power the speakers. I also decided to buy a lot of Dynamat for sound deadening since I heard the RS's are like tin cans.
I was planning on getting:
Alpine MRP-F600 4-channel Amplifier
Kicker 05PKD1 1/0-Gauge Dual Amplifier Power Kit
Kicker 05SI45 5-Meter 4-Channel S-Series Signal Cable
Kicker 05SI27 7-Meter 2-Channel S-Series Signal Cable
Alpine SPR-17S Component Speakers
Alpine SPR-69C 6x9 coaxial speakers
Dynamat 10455 Xtreme Bulk Pack 9 Sheets
I have speaker cable at my house, and if I need to I can always go buy more at Radioshack.
My only concern is if my alternator is going to be able to handle the current load. The mono amp I have hooked up to the subwoofer is the Jensen 900 Power. I think I read it is 340 W RMS and the 4 channel amp I was going to buy is 400 W RMS. According to crutchfield you take the total power (740), double it (1480), divide by 13.8 since that's the average voltage an alternator puts out (107), and divide by 3 since that's the current associated with a normal listening volume putting me at about 35 amps. They also said an alternator can spare about 40% of its current for a stereo, and for a 2.5 RS I read the alternators are rated at 75 amps, so that leaves me 30 amps. That puts me at 5 amps more than I can spare. Do you guys think I'll be alright or am I going to burn out my alternator and have to buy an upgraded one? I don't usually turn the volume up to anything above pleasant and I really only have subs for the low frequencies. I rarely just want to bump.
I also was wondering about tweeter locations. There appears to be a place to mount them right next to the lever to open the door (where the factory ones would be if i had them), but I don't know if its an ideal location. I don't mind cutting a hole in the door panel or A column if it means better sound imaging (my deck has 6 channel time delay, but 2 channels are for the subs, so I still need to get the tweeters about the same distance as the woofers for the front component speakers. I don't think the passive crossovers have delay settings but that would be cool if they did).
So ya, any suggestions and comments you have would be very much appreciated.