I have used it for years with no sonic issues. It is a 12v circuit and has not given me or others I know any diminished performance. Logic tells me, it triggers the unit on and off, again via a separate power supply and is a micro second of employment, and at those two moments, your not listening. It triggers a relay to toggle the power switch and is present in the circuit whether in use or not. My opinion, and may not be a full scientific analogy of the logic, but I like the convenience. Besides if it did cause diminishing performance, would companies targeting the best performance include it?