Well, they do have a truck mounted wheel sensor, so they could determine speeds and change the audio if they were so inclined. However, I ran mine around at a pretty slow speed and then cranked it up to near max speed. I don't hear any more flange sounds at high speed than at low speed, so that my be wishful thinking on your part. I'm not disappointed enough to return it, but I won't be buying any more of them unless the sounds change. 
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