2. amps-preamps
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Crackling Noise ...driving me nuts

I get a crackling noise from my right speaker and it's really harsh also I can hear a slight crackling noise when turning up the volume from both the Front L + R speaker. Finally if all components are on and I turn off the DVD player or my Pre/pro the speakers make a loud buzz noise .

The change I made to my system which resulted in this issue was addition of a McIntosh MSD4 processor. If I remove the processor from the equation and use a HT receiver with my other components the issue goes away.

Has anyone had a similar issue ? Is there something wrong with the pre/pro or is this a ground loop .or interconnect issue. My system details are listed below

McIntosh Pre/Pro MSD4
McIntosh MC 7200 (L + R / Kef XQ5)
B&K ST 140 (L + R Surround / Monitor Audio)
B&K ST 125 Powering the Center Channel (Kef XQ 2C)
britrover
violaguy
21 posts
 
Does it make any difference if the processor is on or off?

I've had a similar problem on two different occasions. Both times it had to do with digital gear that I had added to my system. I discovered that when the offending components (both were DAT machines) were turned off when I wasn't using them, I would get crackling sounds (as if a tweeter were damaged). If I left them on all the time, the problem would disappear. I ended up having a simple switchbox made which allowed me to disconnect the DAT completely from the system when it was turned off.

Hope this helps...
bbaxley2
141 posts
 
try cleaning the volume pot had it happen to me one time on preamp ,radio shack makes the cleaner
britrover OP
1 posts
 
Thanks to everyone who has responded....I'd did manage to isolate the issue to the preamp.....the crackling sound only appears when playing music/movies on the right channel......turning the volume up also results in a slight crackling sound.

If the processor is off all problems disappear.
bdgregory
1,710 posts
 
I had a similar issue that turned out to be a combination of a bad DSP board in my pre/pro, and issue of compatibility requiring a firmware udpate. The compatibility issue was with a new Digital Cable set top box input to the dsp.

You may want to try to isolate it to either the pre-pro, amps, or inputs. It always helps me to have some spare equip around for this purpose.
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