Most of my callers complains about echo issue. This happens due to delay inserted in playing music due to processing by MS-8 and car's own echo cancellation alog gets messed up.
I heard there is a new firmware for MS-8 in which by pressing mute button it stops all processing (just passthru) hence getting rid of echo issue.
There are other installers who claim they have used MS-8 and there are no echo issue, wonder what is special they have done.
650i F12 - HUD, 6WA, SLI, Logic 7, Dynamic and Adaptive Drive, Comfort Access, Soft-close, top-view,
Previous X5 40d M Sports and 535d LCI