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Blow dryer causes audible buzz from power amps in two audio systems...

but only at one speed.  My wife's hair blow dryer causes the amps in both my bedroom system and family room system to audibly buzz.  It only causes the buzz when the blow dryer is on its low fan speed.  Strange.  The bedroom system is close to the master bathroom, where she uses the blow dryer.  But the family room is on the other end of the house and I assume on a completely different circuit.  Now, it does not cause any problem with the audio that the amps are producing.  It is just an audible buzz you can hear coming from the amp. Does this mean there is something wrong with the wiring in my house?  The house was built in 1987.
mtrot
gs5556
1,235 posts
 
Does this happen in just the bathroom receptacle? Is that bathroom receptacle a GCFI?

Try running the dryer on another outlet. If the hum persists you may have a grounding issue at the main panel. If there is no hum, check to see if the bathroom outlet has the wires secured/installed correctly. 
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three_easy_payments's avatar
three_easy_payments
2,097 posts
 
Although a potentially pricey option, divorce may fix this "issue" as well ;-)
tomcarr
1,523 posts
 
Even though I have a dedicated line to a dedicated listening room, I still have some hum and sound quality degradation when the dishwasher or blow dryer or clothes dryer are on. 
Agree with @steakster -  The easiest and least expensive solution is simply to not listen to your stereo while your wife is drying her hair.
And that's what I do.

Tom
petg60
1,486 posts
 
Hi,
DC present in line is common and is not minimized or eliminated if you have a dedicated line for Audio and does not go away if you use different wall sockets. A nearby station may also be affected occasionally and distribute DC to your home line easily. To make things more complicated not only hair dryers but dimmers, refrigerators, led power supplies, micro wave ovens load DC to a line. Few audio equipment use DC filtering, the rest are more sensitive and their transformers will produce noise and heat most of the time. I have found a way to eliminate the problem through a dedicated DC filter (made of 12x 4700mf/25v caps, one for Power amp and one for sources and preamp). Sonically they are not subtracting .
George
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