Mazda 3 - Unusual Vibrations on the Speakers

This is for MW-1118 head units using MW-1118-BRN-CK experiencing unusual vibrations on the speakers.

FIX:

Basically, you’ll just need to swap each solid wire with its matching one that’s got a black stripe — purple with purple/black, green with green/black, white with white/black, and grey with grey/black.