[milhous]

Notebook is a 15" SR MacBook Pro 2.4Ghz.

I mostly pipe audio out to the speakers. But recently, I've been using headphones and have realized that every time a sound effect is played, such as a new mail notification or any system-related sound effect that there is white noise that accompanies it. The white noise remains for several seconds after the sound is played and than goes away

I've also heard random tones from the audio output as well. Best way I can describe it are similar tones that you hear while getting a hearing test using different frequencies.

Anyone else getting this? This is my first Intel Mac, and I don't recall ever getting this on a PowerPC machine.

I'll probably try returning it to Apple before the 1yr. warranty but I can't part with it now as its my only machine.

[seanc]

I was just on TeamSpeex and was getting increasingly annoyed by the high pitched CRT TV like squeal in my ears after people had stopped talking.

I know the Intel switch implemented audio sleeping which is the reason for the popping of the speakers when it hasn't been used for a while, not sure whether the squeal is related to it.

Is it similar to what you hear?

[tridentinecanon]

Same problem here on 17" 2.4.

Only happens with headphones (all my speakers are optical, though).

I do think it is related to the audio sleeping. I also have Soundflower installed, and I'm not certain if it isn't interfering somehow.

[lisa_is_not_mac]

try a new set of headphones, make sure the plug is in all of the way, if the headphones have its own volume control, turn it down. if that doesn't work, i don't know what to do

[tridentinecanon]

Originally Posted by lisa_is_not_mac 

try a new set of headphones, make sure the plug is in all of the way, if the headphones have its own volume control, turn it down. if that doesn't work, i don't know what to do

I'm not certain about milhous, but I suspect they'll agree with me: That's the very first thing I tried.

[iamnotmad]

hi all, this may be the same thing I I am experiencing and posted about a while ago on a new Penryn 2.4 MB. In my case in mostly only happens when waking from sleep. Try this:

1) close lid/put to sleep.
2) wait ~5 mins
3) open up/wake up
4) play some sound, such as the ichat login sound.

When I do this there is some static and a slight ramping up staticy sound accompanying the normal sound. Mostly that is it, but I seem to hear a slight low static tick every now and then.

I brought mine to the genius bar (within a week of having it) by me and they just documented it, It was not really worth swapping out right now (I got an otherwise good machine, and one of the good lcd panels - its luck of the draw). He said and I agreed that it is probably a software/firmware issue. Especially since I cannot seem to reproduce it in windows XP. I think it is related to how OSX is sleeping and waking up the sound hardware.

I'm going to wait for a few updates and see what happens. If not fixed before my year is up I may have them swap out the sound parts which I presume would be the main board.

Im starting to see a few posts on this, if this is the same, and it sounds like it - FINALLY! I say! that people start to notice, I'm sorta glad that this bolsters it likely being a s/w issue, unless we all got defective sound parts (on the M/B!).


edit: here is my old post on apple forums: Apple - Support - Discussions - New Black Macbook, great except sound ...

edit 2: just to add also, if you play a sound that is really short like the new mail sound or even the volumen change notification, the static/hissing will continue until it is done - lasts a couple/few secs. It is sort of harder to hear this way (by itself, unless you have a very quiet environment or headphones with the vol up.