In reply to:

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Normally, I listen at about -20db, pushing it to ~-10db if I have the top open, and windows down at about 90+ mph. Past that and it's just silly loud.

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I had the same experience. I had forgotten that I had my fader was tweeked to the rear before the upgrade. after the upgrade it was neutral. Now its faded to the rear 2 bars again and I am back to listening at -20db. Maybe this was the case for you too?

-Doug
Mk2-12G Blue (Now A/R Green)