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Not sure mine has the ANC. I have not experienced any unusual noise/sounds from the audio system while on the road. BTW, some folks, on our forum, have not spoken well of the customer service from that particular vendor. I did not find any 12V switched power in the rear fuse box. I could have missed it.Great write up. Won't you need a ANC bypass like they sell on lljcustoms.com? Could you have used a fuse tap for the 12V switched power?
I have read the same material that you reference. I tried to "listen" for that effect. If it did lower the bass volume, I really couldn't detect it. I might drag my o'scope out there one day and see what I can see.I've read a little about the factory sub channel lowering power as volume increases. Have you measured for this "feature?"