The thoughts of having a more powerful system has always crossed my head since I first bought the car. I did not want to install another deck but I kept the option open. I started looking into the factory navi audio system to see what type of outputs the system has. The navi audio system has differential balanced outputs directly to the factory amp. Each signal is full range including the sub signal. The sub signal does has bass limiting, I was hoping bass limiting was at the factory amp. I did not find much eqing on the 4 full range signals. That's good news because I can directly run these signals to amps that accept differential balanced signals. The only amps that came to my mind were jl audio, zapco, rockford fosegate, and kicker. I still need a signal processor for the sub channel itself and the mtx re-q came into my mind. Since is main purpose was to restore cut-off bass.
Here's a picture of the connector I drew for the connector feeding differential balanced signals into the factory amp.
For more information about differential balanced outputs:
xxx.acurazine.com/forums/showthread.php?t=360946&page=1&pp=40
replace xxx's with www's
update one: I have all the pinout information along with description.
Stereo Amplifier Connector A (24P) (from head unit to factory amp)
A1 BRN Ground (G402) (GND)
A2 RED Audio unit (FL PRE-)
A3 GRY*Audio unit (SH FL GND)
A4 RED Audio unit (RL PRE-)
A5 RED Audio unit (FR PRE-)
A6 GRY Audio unit (SH FR GND)
A7 RED Audio unit (RR PRE-)
A8 RED Audio unit (SUBW PRE-)
A9 BLK Audio unit (SH SUBW GND)
A11 WHT Audio unit (ANC F-)
A12 GRN Audio unit (ANC R-)
A13 LT GRY Audio unit (AMP MUTE)
A14 GRN Audio unit (FL PRE+)
A15 GRY*Audio unit (SH RL GND)
A16 GRN Audio unit (RL PRE+)
A17 GRN Audio unit (FR PRE+)
A18 GRY*Audio unit (SH RR GND)
A19 GRN Audio unit (RR PRE+)
A20 GRN Audio unit (SUBW PRE+)
A22 RED Audio unit (ANC F+)
A23 BLK Audio unit (ANC R+)
A24 WHT Audio unit (SWD +B)
*The shielded wires have a heat-shrink tube insulating the outside of the wire. The color of the insulating tube,
typically black or dark gray*
From amp to crossovers to speakers
-FL: +Dark Gray / -Purple
-FR: +Pink / -White
-RL: +Yellow / -Brown
-RR: +Dark Blue / -Orange
-Sub: +Gray / -Blue
update #2 (Crossovers separated from the amp, GOOD NEWS!)
Turns out the premium audio system's crossovers are not part of the factory amp which is good news for us. We can now replace speakers freely knowing that these factory crossovers can be replaced. The passenger's crossover is located right behind the six-disc cd changer, and the driver crossover is located under the driver side dash.
Driver's Door Speaker Crossover Network Control Unit 8P Connector
2 GRN Stereo amplifier (FL SP+)
3 PUR Stereo amplifier (FL SP-)
5 RED Left front door tweeter (TWEETER+)
6 GRN Left front door tweeter (TWEETER-)
7 LT GRN Driver's door speaker (SPKR+)
8 PNK Driver's door speaker (SPKR-)
Front Passenger's Door Speaker Crossover Network Control Unit 8P Connector
2 PNK Stereo amplifier (FR SP+)
3 WHT Stereo amplifier (FR SP-)
5 BRN Right front door tweeter (TWEETER+)
6 WHT Right front door tweeter (TWEETER-)
7 GRY Front passenger's door speaker (SPKR+)
8 RED Front passenger's door speaker (SPKR-)
Speaker sizes:
Front speakers: 6.5 inches, requires a adapter for mounting aftermarket speakers
Rear speakers: 6.5 inches, requires a adapter for mounting aftermarket speakers
factory sub (ex, ex-l): 8 inches
I will update this post as I discovery more.:thumbsup:
Here's a picture of the connector I drew for the connector feeding differential balanced signals into the factory amp.
For more information about differential balanced outputs:
xxx.acurazine.com/forums/showthread.php?t=360946&page=1&pp=40
replace xxx's with www's
update one: I have all the pinout information along with description.
Stereo Amplifier Connector A (24P) (from head unit to factory amp)
A1 BRN Ground (G402) (GND)
A2 RED Audio unit (FL PRE-)
A3 GRY*Audio unit (SH FL GND)
A4 RED Audio unit (RL PRE-)
A5 RED Audio unit (FR PRE-)
A6 GRY Audio unit (SH FR GND)
A7 RED Audio unit (RR PRE-)
A8 RED Audio unit (SUBW PRE-)
A9 BLK Audio unit (SH SUBW GND)
A11 WHT Audio unit (ANC F-)
A12 GRN Audio unit (ANC R-)
A13 LT GRY Audio unit (AMP MUTE)
A14 GRN Audio unit (FL PRE+)
A15 GRY*Audio unit (SH RL GND)
A16 GRN Audio unit (RL PRE+)
A17 GRN Audio unit (FR PRE+)
A18 GRY*Audio unit (SH RR GND)
A19 GRN Audio unit (RR PRE+)
A20 GRN Audio unit (SUBW PRE+)
A22 RED Audio unit (ANC F+)
A23 BLK Audio unit (ANC R+)
A24 WHT Audio unit (SWD +B)
*The shielded wires have a heat-shrink tube insulating the outside of the wire. The color of the insulating tube,
typically black or dark gray*
From amp to crossovers to speakers
-FL: +Dark Gray / -Purple
-FR: +Pink / -White
-RL: +Yellow / -Brown
-RR: +Dark Blue / -Orange
-Sub: +Gray / -Blue
update #2 (Crossovers separated from the amp, GOOD NEWS!)
Turns out the premium audio system's crossovers are not part of the factory amp which is good news for us. We can now replace speakers freely knowing that these factory crossovers can be replaced. The passenger's crossover is located right behind the six-disc cd changer, and the driver crossover is located under the driver side dash.
Driver's Door Speaker Crossover Network Control Unit 8P Connector
2 GRN Stereo amplifier (FL SP+)
3 PUR Stereo amplifier (FL SP-)
5 RED Left front door tweeter (TWEETER+)
6 GRN Left front door tweeter (TWEETER-)
7 LT GRN Driver's door speaker (SPKR+)
8 PNK Driver's door speaker (SPKR-)
Front Passenger's Door Speaker Crossover Network Control Unit 8P Connector
2 PNK Stereo amplifier (FR SP+)
3 WHT Stereo amplifier (FR SP-)
5 BRN Right front door tweeter (TWEETER+)
6 WHT Right front door tweeter (TWEETER-)
7 GRY Front passenger's door speaker (SPKR+)
8 RED Front passenger's door speaker (SPKR-)
Speaker sizes:
Front speakers: 6.5 inches, requires a adapter for mounting aftermarket speakers
Rear speakers: 6.5 inches, requires a adapter for mounting aftermarket speakers
factory sub (ex, ex-l): 8 inches
I will update this post as I discovery more.:thumbsup: