Touareg: 2006 V8
Join Date: Sep 2018
Location: United States
Second Vehicle: VW 2
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Shooting from the hip...
from what I can recall from all of the research I've put in, the front doors have three speakers - tweet, mid, woofer. (different impedance ratings)..plus what is in the back doors and the center channel in the dash...but it varies from year to year and trim to trim
(in my T1) the amp in the rear quarter has 21 or so wires coming out of the amp...fewer going into (power, ground, signal).
In any case, due to the staging and the quantity of the speakers, the amplifier could also be doing sound processing, cross-over, and time delay functions, but I am not entirely sure; I haven't had enough time to read all about the OE amplifier. My T1 V8 has 6 front door speakers, 1 center channel, and 4 rear door speakers -- 11 total. I need to trace my wires, and again, read up on all of the possible configurations of all possible layouts a T1 can have.
I have not had time to read what the input voltage is on the OE amp. Chances are high it is different than the industry standard - 2V-4V out of RCAs (low level signal) of most aftermarket HU. If you use the high level signal of the speaker wire, it may not be the right voltage as it has been amplified by the new HU and the amp in the back isn't seeing the optimum signal. Car audio is fun...
In my past Nissan PF that had a factory Bose system, when I replace the factory (Bose) HU with a JVC unit that used a factory harness, I lost most of the low end bass and some overall volume. (I played with the gain controls following the directions supplied by Crutchfield and Schoche) The Bose amp(s) did not like the new signals coming from the new JVC HU speaker wire-out high level signal and the Bose amps were not processing the signal correctly. OE Bose gear does not play well with non-Bose gear.
When I put the stock Bose HU back in, the bass returned and the overall volume increased.
If you decide to bypass the stock amp in the back, you will need to run new speaker wire to each speaker or clusters of speakers. you might have to find or make cross-overs (3-way and 2-way) so the right frequencies are sent to the right speaker. There is so much going on with a multiple speaker set up that in order to do the right thing, you have to develop a plan to achieve the goal you are looking for.
The sky is the limit...