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rfpete
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Joined: Aug 3 2007 - 11:48am
Amp Making Popping/Crackling Noises

Hi All,

Here's a mystery for anyone to try and figure out.

Earlier this week I heard a crackle or popping noise coming from my speakers. It occurred a few times, randomly, as I was watching TV (which I use my system for). The crackling wasn't loud, and it continued even as I turned the amp's volume knob all the way down. The volume level on the amp didn't seem to affect the crackling volume. Later, I heard the noise when the TV was off and no source component was being used. (I keep the amp on at all times)

The integrated amp is a Rega Mira and is about a year old. The speakers and speaker cable are newish also.

It's never heard this before, what might cause these sounds? I haven't had much time yet to investigate, I'm kinda hoping the problem just disappears.

Thanks!
Ryan

JIMV
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Your description needs

Your description needs fleshing out...Is the noise coming from both speakers or just one side?

To be honest, this sounds more like dirty contacts than an amp problem...I would suggest you get a good contact cleaner. disconnect the speakers, clean the daylights out of the contacts at both ends of the cables, reconnect them and see if the problem goes away.

rfpete
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I'm nearly positive the noise

I'm nearly positive the noise is only coming from the left channel outputs. I'm going to run the L channel outs to the right speaker and see if the noise switches sides.

I'm also going to try plugging the amp into a different outlet.

I did clean the connections with rubbing alcohol. It wasn't a thorough cleaning, but I've only had the cables (banana plugs) for about 6 months. I'd be surprised if dirty connections were the problem.

We'll see what happens.

rfpete
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Dirty connects

JIMV, it seems you were correct. The crackling has stopped, as far as I can tell.

I cleaned the ends of my banana plugs three times with rubbing alcohol. Before cleaning, the bit of metal exposed at the connections was discolored or tarnished looking.

What causes the discoloration and why does this lead to crackling noises? Also, I had my last pair of banana plug cables for 2 or 3 years and never had any problems like this. Should I worry, or just keep them clean?

Thanks for the help.

JIMV
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I would recommend investing

I would recommend investing in Detox or Kontak, both reasonable and long lasting. I have found I need to clean connectors at least every couple of year or something will get noisy.

http://www.musicdirect.com/product/74454

rfpete
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It's Back

The intermittent popping noise is back. It was loud enough to wake me up last night. I've determined that it's definitely not the speaker. And probably not the speaker cables or power supply. I'm going to monitor it a few more days to be sure that it is the amp creating the noise. Then I'll go to the dealer and take advantage of Rega's warranty.

tom collins
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you could try taking it to a

you could try taking it to a friend's house and see if you get the same problem. or simpler, try plugging into an outlet on a different circuit if you are able to isolate a different circuit through your breaker box. also, try unplugging or turning off every appliance in your house that you can.
just some thoughts.
good luck.

tom

rfpete
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Left channel

Tom, thanks for the ideas.

The noise only comes out of the left channel speaker outputs. If the problem is the outlet, or house wiring, could the noise be isolated to the left channel only? My intuition says the noise would come out of both channels simultaneously, but I'm not an electrical engineer.

Any engineers out there want to provide their expertise?

roadster
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If the noise is only in the

If the noise is only in the left speaker the problem is not house power. Try disconnecting any equipment that is connected to the Mira and see if the sounds percists. If so you know where the problem lies. If not begin plugging your equipment back into the amp one piece at a time until the noise returns.
Keep us posted.

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