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I think that you need a new installer... and that there are some posts on this forum that would hugely benefit you.
The "new" clean sweep is only an external module for the original clean sweep. It allows speaker level channel summing like the AudioControl LC8.
If you do what I've documented doing (with the help of others) you don't need it, or the clean sweep, or an LC8. HU output is flat as a pancakke above like 35% on the volume control and that curve is simply a mild auto-loudness Fletcher Munson curve that is not even detectable when driving.
If you want an aftermarket HU for features, fine... but from an SQ perspective, the OEM HU can sound very good when properly interfaced... and that interface can cost less than $400 and not take up nearly the amount of room the CS will.
The W7 will definitely come out a ways and the W6 would probably not fit either.
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musicar northwest, portland oregon
musicarnw.com
The West Coast BMW audio experts
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