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I've installed a Sony XAV-AX5000 in my '03 BMW M3. Knowing that the factory headunit outputs a higher voltage balanced signal (up to 12 volts) to the factory Harman Kardon amplifier, I have a AudioControl Matrix Plus to boost the signal from the aftermarket headunit. I used a multimeter to set the gains on the Matrix Plus, but am running into some weirdness. Trying to isolate where the issue is (might be the Sony), I'm wondering if I'm ok sending a non balanced/differential signal to the factory amplifier?
 
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