Unfortunately thatís kind of the norm for Boom stuff, the fade isnít linear at all.
I would highly recommend turning the AVC off and keeping volume no higher than 14/17. The HU distorts above that level and it wonít take long to find out why we call it kaboom instead of boom.
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2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.