The DSP’s do help but the root of the problem is the SYNC 3. If you do decide to install the Zen A2B be sure and order an extension cable from Nav-TV so that you can place the unit where it is readily accessible. You will need to access this unit for the initial programming and periodic updates...
I did a complete audio upgrade on my 2018 back in September.
Took out the all of the B&O components and replaced them with the Nav-TV Zen A2B, JL amps and speakers. It sounds good but not great especially when compared to my 2007 Suburban with a Kenwood Excelon head unit.
I used a highly...
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