Carputer outputs into Monsoon amp
Great news everyone! We beat the "impossible to resolve" Monsoon issue. My carputer's outputs are running directly into my Monsoon amp and working as VW originally intended. The secret: VW is sending a 1/2 battery voltage DC signal on the speaker wires that tells the amp to power up. There is no typical, designated trigger wire to tell the amp to turn on because the speaker input signal is carrying it. So we have the system working. We're stealing the 5V signal from the Opus and as you can imagine, there's a little bit of noise on it. But we're working on a filter to clean out the noise. News as it develops!
The 5V has to go into the left channel to get the amp to power up. We fed it into the left channel common. I used a 10k ohm resistor in series to drop the amperage, just in case - I didn't want to overload the amp. For the record, the Monsoon's Head Unit speaker A/C outputs are virtually identical to the carputer's!