Do cars play engine noise through speakers?
Other vehicle manufacturers have also used artificial engine noise systems, implemented in other ways. Some models of the BMW M5 add noise to the car’s audio system, for instance, and the 2015 Ford Mustang also added a system for sending the car’s engine noise through its speakers.
How do I fix the engine noise in my car stereo?
Install an Inline Noise Suppressor
You install these suppressors inline before you add an aftermarket radio or amplifier. While they will not stop the noise 100%, it will reduce the noise by a significant amount. If the alternator is the culprit, then the suppressor should help solve this issue.
What causes alternator whine in speakers?
Alternator whine is almost always caused by a ground loop. The following steps will aid you in locating and correcting a ground loop problem. Verify that all levels are set properly.