Noise cancelling speakers help 2010 Chevy Equinox get +1 mpg
In the past, the engineers might have avoided those kinds of calibrations and just taken the hit on efficiency. This time however, they got approval to employ active noise cancellation. A pair of microphones embedded in the headliner listen for those frequencies and then generate an opposite wave sound from the audio system speakers to cancel out the offending noise. By using this technology to offset the negative NVH effects, they were able to get a one mpg improvement in economy for the four cylinder Equinox.
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