Question about Lutron MIR-600 Remote Control

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Audio system buzz with dimmer-controlled track

This question is regarding generic dimmer-related audio buzz, not just Lutron.

My audio system buzzes with dimmer-controlled track lights turned on. The buzz is higher-pitched or harmonic instead of 60hz hum and it gets louder on the audio as the brightness is increased.
I bought an older home and it has two tracks with three lights each on a wall-mounted dimmer. After installing my sound system I noticed a buzz over all channels when the track lights are on, but ONLY when my PC is the analog sound source. I have numerous analog and digital sources and a variety of audio processors and had swapped out each audio cable in the path to no avail.

I replaced the aging dimmer with a Lutron remote-controlled one and it made no difference.

I found something here http://www.houseinprogress.net/archives/001060.html about trying to find bulbs resistant to buzzing.

What is the functional difference between a dimmer marked for Low Voltage and one that is not? They both work on 120AC in and out.

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It may be too late given the date of this post, but the buzzing has nothing to do with the bulbs (usually, dimmers and lamp buzzing are a common problem which is why you probably got the suggestion), but in your case, you have radio-frequency interference from the dimming circuit leaking into the audio circuit. The best things you can do is either minimize the RFI, or separate the audio circuit away from the dimming circuit. Based on what you're saying about the PC input, it sounds like the main culprit is that specific audio wire going between the PC and the sound system - can it be run differently so that its further away from the dimmer/circuit. Are the PC and the dimmer on the same breaker? - If so, maybe noise is radiating from the dimmer into the PC through the power wiring - putting on different breakers could help.
One more note, the best dimmers, in terms of RFI performance, are reverse-phase control dimmers (usually designed for electronic-low-voltage... and be careful because they often get confused with magnetic low-voltage... and those will not help. Without going into too many specifics, the ELV dimmers have a much softer on/off/on/off dimming cycle when compared to standard incandescent dimmers (this is a circuitry thing with a much more complicated explanation), but as a result, they tend to have significantly fewer issues with RFI. They can be an expensive solution for simple problem solving, but the MIRELV-600 should do the trick (again, don't be fooled, the MIRLV-600 is the magnetic low-voltage product, and for what you're doing, won't help).

Posted on Oct 04, 2010

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Have you looked at the manuals?

http://www.retrevo.com/search?q=sony+nx810

A TV won't run external speakers directly. Besides, the TV-related audio should originate at, say, the cable Box, and go straight to your (presumed) AV receiver for the best possible decoding and reproduction.


Buzzing is an analog phenomenon and is NOT carried by optical cable in any case.

Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversible, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's. I've also seen variable track lights induce noise but it's usually minor.

Try rotating the power cord in the wall outlet.

If it still buzzes with no cables or anything external attached there's an internal problem.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.

Reverse the cables Left to Right to see if it stays with the cable or the input channel. Follow it back to the source, isolating in the same manner. Eventually you will find the entrance point of the hum. Frequently a cable's ground will oxidize over time and simply removing and reattaching the cable with a twisting motion will re-establish the shield.

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Buzzing is usally AC line noise leaking into an un-shielded cable somewhere or a floating ground. If the AC plug is reversible, try that. Sometimes the buzz is from an attached device. Make sure all audio cables are plugged in tightly at each end and routed away from or at right angles to any power cords and away from other sources of strong magnetic fields like TV's.

Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights.
I've also seen variable track lights induce noise but it's usually minor.

Try rotating the power cord in the wall outlet.

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