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Occasional audio 'pop' using analog output

2939 Views 7 Replies Latest reply: Jan 29, 2012 7:32 PM by fane_j RSS
dartmouth1337 Calculating status...
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Nov 29, 2010 8:24 AM
When watching a movie and hooked up to my fairly large speakers, the audio will give an occasional "pop". Now, this doesn't happen too often, but in the course of a long movie, it may happen two or three times. I don't seem to encounter this problem with headphones on. Now, is this a problem of the computer, or the speakers themselves?
MacBook Pro, 13"
  • dubprocess Calculating status...
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    Nov 29, 2010 5:31 PM (in response to dartmouth1337)
    Could be a connection problem. I doubt there are any issues with your audio jack considering your headphones work with it with no issues. It seems like your issues may be with your speakers or the connection from the actual wire of the speakers.

    I have the Logitech 2.1 system and sometimes the audio will pop when I plug them in and the volume is turned up. Try different headphones or mini-jack connections if they all work it is more than likely an issue with the speakers.

    Message was edited by: dubprocess

    Message was edited by: dubprocess

    Message was edited by: dubprocess
    MacBookPro 2.4GHz Intel Core 2 Duo 15-inch OCT 2008, Mac OS X (10.6.5)
  • maphive 6.1 Calculating status...
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    Feb 8, 2011 10:12 AM (in response to dartmouth1337)
    two possible sources for audio pops:
    1 - the soundcard om my MBP17" shuts off after a while if no sound is playing... if I got headphones on a small "pop" can be heard. I guess this is done to save power. (The soundcard of my old PowerBook G4 17" doesn't have this behaviour at all)

    2 - the electrical system of your home, it can be quite sensitive. My fridge starts and stops in a periodical manner because of it's automatic defrosting feature. It seemed to produce a "spike" in the electrical current. In my old apartment this affected my hifi system - a quite loud pop appeared in the speakers everytime the fridge started up after defrosting. A cheap little filter device in the electrical jack for my hifi amp solved that issue. (don't put it in the jack for the fridge, I did that first - the fridge blowed the fuse for the filter and shut off all electricity for the combined fridge/freezer - not that good... )
    Unibody MBP17" (2,93 Ghz) Antiglare + MBA11" + PowerBook G4 17" (DL DVD, Rev E), Mac OS X (10.6.6)
  • gonafr Calculating status...
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    Mar 8, 2011 2:05 AM (in response to maphive 6.1)
    I am also having this problem.
    I have a MacBook Pro 15" (late 2008) running Snow Leopard.

    It also happend when playing sounds.
    I have my Logitech Z-2300 speakers connected to the electric system through a electric filter against "spikes".

    Does anyone found the reason?
    MacBookPro 5,1, Mac OS X (10.6.6), Apple
  • George Machen Calculating status...
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    Jan 29, 2012 10:15 AM (in response to dartmouth1337)

    Is there a Terminal command ("defaults write" ...) that disables the automatic shutdown of the sound circuit after a period of audio inactivity?

     

    As a workaround, I made this AppleScript applet to play a silent sound file every 20 seconds, but sometimes the applet suddenly starts hogging the CPU and I have to quit it. It's an AppleScript thing, not this particular code, because I have a couple of other idle handlers that also suddenly start hogging the CPU, but I digress.

     

    I would rather put a stop to the auto-audio-cutoff in the first place. (It's supposed to save battery power, but there's no reason for it when plugged-in to AC. It wouldn't really matter except for the "pop" from the speakers.)

     

    on idle

        do shell script "afplay '/Users/[user]/Library/Sounds/Silentium.aif'"

        return 20 -- (Execute this idle handler once every twenty seconds.)

    end idle

  • fane_j Level 4 Level 4 (3,655 points)
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    Jan 29, 2012 7:29 PM (in response to dartmouth1337)

    dartmouth1337 wrote:

     

    I do hear the occasional audio pop w/ headphones on, but it is very quiet and subtle.

    Lots of things going on here. What you may not notice with the headphones may be very noticeable with speakers. What you need to do is isolate the issue -- after all, the 'pop' may even be from the source. So track them methodically through your audio system. Presumably you use some sort of amp -- could they come from the amp? And so on.

  • fane_j Level 4 Level 4 (3,655 points)
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    Jan 29, 2012 7:32 PM (in response to George Machen)

    George Machen wrote:

     

    Is there a Terminal command ("defaults write" ...) that disables the automatic shutdown of the sound circuit after a period of audio inactivity?

    Not that I know of. But that cannot be the OP's problem.

    I made this AppleScript applet to play a silent sound file every 20 seconds

    Ingenious, but AppleScript is ill suited for this kind of task, as you noticed yourself. A better option is a shell script, or use AntiPop

     

    <http://www.tomsick.net/projects/antipop.html>

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