Yeah i know what you mean. I have rca's going from the converter to a bass knob in the front of the car, the other rca's from the bass knob go to the sub amp. I can turn the sub up or down without affecting the speakers but I bet I could control the sub better with one of those head units. If the signal is cleaner from the head unit that will give me tighter bass.

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2005 BMW X5 3.0i
2013 BMW M3 Competition