Has anybody ever connected an aftermarket amplifier to a standard HU in an E90 with Hifi sound option? I am having difficulty summing the signals off the factory amplifier. I've tried a line out converter but this is only good for connecting one amp and aftermarket subwoofers. I've replaced all the factory speakers and included a 10" sub as well. I tried the JL AUDIO summing device. Sums up signals decently but line noise is a problem. Tossed the JL unit and I'm now using an audio control LC7i but even though I've tapped all speaker signals, there's still a frequency missing. Any suggestions?
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