Optical Out "rumbles" on startup

When I boot my Mac Pro the speakers will have a low (but often quite loud) rumble. Many times the rumbling won't stop until I play some other sound. This is through the optical out (if I unplug the optical out from the speakers it stops).

How do you know it is not the device/speakers the optical cable is connected to?

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Is there a way to turn off/disable digital optical out? 1.9 iSight

I have an iMac 1.9 with iSight. No sound from speakers except the startup chime.
The digital optical out sound connecter is bad and the red light is on, and no it is not a matter of just getting the red light off... the connector is psychically broken as there is a little spring in the connector that came loose somehow.
So I was wondering if somehow if digital optical sound could be disabled thereby allowing regular sound work?
Thanks,
Bill...

Digital or analog output is determined by the connector inserted into your now-damaged socket. There is no way to 'turn off' digital output in such a manner that analog output will then be 'turned on.'
I'll check to determine if your logic board can be repaired at a reasonable price and post back. Apple's stock solution is to exchange the module, and in your case, this otherwise exchangeable part if covered by warranty or an AppleCare extension to it would not typically be covered, because of what would be construed to be 'user abuse.' Don't be offended: that's the official term. Not an indication that you intentionally damaged to component.

Optical Out and Airplay status

I remember when 4.4 came out, the optical out was thoroughly hosed for people who use the ATV as a simple audio-only bridge to an amp, with no HDMI cable attached. I was able to downgrade to 4.3 in time and have stayed there ever since, though I think the bug was fixed in a 4.4 revision. I've since heard people complain about subsequent updates that there can be a burst of static when optical commences. Starting with 4.4, there was also what I remember calling the "Airplay two-step bug", which required one to go back and forth between the Apple TV and the iPhone/iPod targets to get the Apple TV to play. What's the current state of the ATV2 WRT optical out and these and any other issues?

Hi, and a Warm Welcome to the Power Mac G5 Forum!
Presumably it's the Startup Bong that's getting on your nerves - as you shouldn't be hearing Application sound from the puny internal speaker if you have set all the Preferences to use optical audio-out.
The Bong is part of the Startup routine in firmware, and goes to the basic audio circuit because OS X, and your Sound Preferences selecting optical audio-out, haven't been loaded at that initial stage.
The hardware solutions you have already mentioned.
These may be of interest
http://macupdate.com/info.php/id/16425
http://www.versiontracker.com/dyn/moreinfo/macosx/25458
http://www.versiontracker.com/dyn/moreinfo/macosx/28685
Personally, I find the tinny Bong mysteriously reassuring. Good Luck.

Optical out and internal spaeker issue.. i need help..

how can i get rid of the internal speaker sound without disconnecting it from the board or pluging any 1/8 trs jack at the back while using optical out.
need help ...... thanks!!!!

Hi, and a Warm Welcome to the Power Mac G5 Forum!
Presumably it's the Startup Bong that's getting on your nerves - as you shouldn't be hearing Application sound from the puny internal speaker if you have set all the Preferences to use optical audio-out.
The Bong is part of the Startup routine in firmware, and goes to the basic audio circuit because OS X, and your Sound Preferences selecting optical audio-out, haven't been loaded at that initial stage.
The hardware solutions you have already mentioned.
These may be of interest
http://macupdate.com/info.php/id/16425
http://www.versiontracker.com/dyn/moreinfo/macosx/25458
http://www.versiontracker.com/dyn/moreinfo/macosx/28685
Personally, I find the tinny Bong mysteriously reassuring. Good Luck.

Optical out/internal speakers no longer work

Hello,
I was wondering if anyone could help, my macbook now believes that there is an opitcal lead in the jack all the time - and so the internal speakers no longer work, i can plug in headphones and the optical but when everything is removed then no speakers - its just set at optical out.
any ideas would be most welcome as i would rather not spead money on repair or just it sent off for ages - thanks
craig

when you turn the machine on with nothing in the audio out, do you get a startup sound?

When I plug my headphones into the headphone/optical out jack programs hang

I have an iMac 20 inch LCD. On the back their is a jack with a picture of headphones, but it is also labeled as "optical out". I plug my headphones in and they work. Great. That is not my problem today.
My problem is that whenever I plug the headphones in or unplug them, iTunes (and other apps using audio) hangs and when I try to adjust the volume with the keyboard buttons nothing happens for 15 seconds or more and then the volume changes, not that anything is able to play. If I wait for a minute or so then all my applications start working fine again and I am able to hear my music and adjust the volume.
What in the world is going on?
1.8 Ghz G5 1.25GB RAM Mac OS X (10.3.9)

Thank you. That is good information.
Does this mean that there is nothing I can do about the delay? When I think of a delay, I think of maybe 10 seconds. I am having to wait for a minute or more for my audio to switch. While I wait, I have no audio and any audio program hangs. Is there a setting I can change? It seems rather ridiculous that I have to wait so long just to switch from internal speakers to headphones.
It is like this on other Mac machines? Or it is just my iMac? I hate to compare Mac to Windows, but on Windows or Linux computers the switch is instantaneous.

How to switch off the red light (optical out) on my Audigy 2

I am not using the optical out most of the time, is there a way to switch off the red light coming out of optical out?red light is causing heat leading to cracks on the surface of the card.Please help soon. thx

Are you sure? AFAIK, LED's don't produce any significant amounts of heat. And, no, I don't think the light can be switched off.
-Dave
?[email protected]

Creative inspire t6300 5.1 surround on mac pro 1.1, optical out to 5.1 audio gear (digital sound decoder).

Hi there,
Been searching and trying a lot but no luck so far. I have a surroundset Creative Inspire t6300
to be able to add some more fun to movies and a few games on my mac.
I own an upgraded Mac Pro 1.1 under Snow leopard, 2.33 gHz, dual processor, 8 core, 8 gb memory.
Even though it`s a piece for the museum, it works very well for designwork I do for work. No real need
to update for me, so....
As I understand, the optical out is standard 5.1. (By the way, the only other ports are the basic sound ports out
and in on the Mac). So after some research I found and got the 5.1 audio gear decoder. I connected this with
an opticle cable and used the 3,5 jackets from the surroundset to connect to (from left to right) cen/sw, (yellow
jacket) fl/fr (green jacket), sl/sr (black jacket) on the decoder. All perfectly understandable and it seemed to work well.
But when I tested with some of the testfile you find when googling on that, I think there is something wrong,
the typical surround effect is not there, it rather sounds more like stereo or even 5 mono`s.
I`ve tried Soundflower and JackPilot, but couldn`t get it right. With Soundflower I was able to choose 5.1 setting
(was not possible before) but testing it didn`t work.
There is an extensive test of the decoder on the net by someone who really is deep into the technics of it all but
no luck there either.
Back to basics: is it right that the optical out is truely 5.1 on the mac? With several tests the unit SFE does not react.
But when I play some music with iTunes, it works (loud and clearly :-)). Maybe I need a visit to the audiologist ;-) ?
Anyone?
tested with: http://www.youtube.com/watch?v=eL9-sIZRDHg&channel=alexnosenko
http://www.youtube.com/watch?v=sMh_zvCw6us
https://www2.iis.fraunhofer.de/AAC/multichannel.html

Hello John, I figured it was a signal issue. All the speakers fire and the sound is great. I was running the speakers thru a Dell PC with a Creative X-Fi Elite Pro, THX Certified, 7.1 soundcard using a fiber optic from the Mac Pro to the Z906's, it worked great until the Dell died!!! When I bought the soundcard from Creative I also bought the GigaWorks S750, THX Certified, 700 watt, 7.1 speaker system, used the speakers for 11 years and then the woofer/amp said "I QUIT" Creative quit making the speaker system and the sound card. The satellite speakers from the Creative GigaWorks speaker system still sound great (rated at 78 watt each) and are a little better speaker than the one's that came with the Z906 and the wattage from the 906 is sufficient to drive the satellites without any distortion. Thank you for addressing my issue, you confirmed what I suspected all along, just needed to hear it from someone with the same setup.
One last question, I purchased a Diamond Multimedia USB Soundcard, can't use the fiber optic(not supported by Mac) but the green, tan and black RCA's plug in and produces adequetly. When you plug your 906's into the Mac Pro using the fiber optic how do you set your speaker configuration? When I plug into the mac pro with fiber optic the 'Audio Midi Setup' does not seem to see the 5.1 configuration. Any thoughts there?
Carl

Hooking up the digital optical out to my stereo reciever

I just got a new Core 2 Duo Mac Mini and I want to hook the digital optical out to my stereo. However, I noticed the connector does not seem to be a standard stereo optical cable. What do I need to do to connect this to my stereo reciever which supports digital optical in?

Actually some toslink cables that yoiu buy, come with them. I remember buying a 6' Philips that included the adapters.
Oddly enough, I think I found it at Wal*Mart (maybe target).

No optical-out sound on MSI KT4-Ultra!!

Hi, I have recently set up a system based on the MSI KT4-Ultra board. I'm using an Athlon XP 1700+, a Radeon 9000 video card, and I've installed Windows 98.
Although all the drivers and audio applications which MSI provided installed fine, and 2-channel audio from the on-board sound chip works great both for music and for the 3-4 games I've installed so far, I can't seem to get the optical SPDIF port to work! I bought a cable and connected the computer to my Sony MD-player and attempted to copy my CDs onto MD. I go into the MSI control panel and check the box to enable SPDIF-out, removing the speaker cable from the analog line-out just for good measure. When I plug the optical cable into my MD it recognises digital input and prepares for recording. I press record on the MD and play on the computer's CD-player app, but the MD LED shows "no signal". I'm pretty sure both the MD recorder and cable are OK since I've used them to copy CDs from a Kenwood portable CD-player quite recently, so it must be the MB that's giving me problems. Indeed, when I've stopped playback in the CD-player app and went back into the audio control panel, I found that the SPDIF box had been unchecked of its own accord. I've tried this several times, and I've unplugged the S-bracket and reinstalled it all over again just to make sure it was plugged in properly, and I still get the same problem. All audio works fine except optical out! Haven't got a coaxial cable or recorder so I can't check if the coaxial port is equally buggered or if it's just the optical, but I'm getting really annoyed here: this was the one feature I liked best about this board and the only one which isn't working! Any ideas, anyone?

dude, i think i can get u ur signal, but currently i can only get silent recordings, u may have better luck.
on the minidisc, there should be a switch or button that will toggle synchronised recording on and off, turning it off should get u a signal, but it wont be in sync wiv the cd, ie u cant trust it to form track gaps.
hope that helps, done flame me if it dont, if i manage to get substance to my recording, i will send u the info just in case.
take it easy

Optical out sends constant noise to speakers

Hi,
Is it normal that when I connect the optical out to the surround sound system the speakers produce a constant hissing noise. If I connect any other device with optical out to the surround system instead of the AppleTV, the speakers don't produce this annoying feedback noise. Is this a problem with my specific AppleTV or is this a design malfunction in all AppleTV devices.
The noise always has a constant volume.
I have tried connecting it to a different surround sound system, and the AppleTV
still produces the same noise. It's likely that most people won't be bothered by
this, but I have sensitive ears and I did expect high quality output from this
rather expensive device (given the limitations apple has enforced upon it, even though the hardware is capable of so much more).
Thnx.
(To bad I couldn't get online support from Apple for the AppleTV, seems
they only have e-mail service for iTunes store????)
Message was edited by: timothyparez

This is a public update of Lion available since last night.
No a developer thing.
Click in your "Apple" menu (top left) and then "Software Update"
The usual procedure.
I have left my machine on all night long and the sound is still good and the "SoundStay" app is still runnig fine.

Connecting 5.1 desktop speakers directly to optical out on iMAC - how?

I have Logitech X-540 speakers
http://www.logitech.com/index.cfm/speakersaudio/home_pcspeakers/devices/234&cl=us,en
I can only find external sound cards that hook through USB. Is there a way to connect the 3 colored cables (orange, green, black) from the Logitech speakers to some conversion cable or cable converter to connect to optical out on the back of the iMAC? I have read the forums and can't find much aside from connecting your iMAC to a home theater setup. Thanks!

discbrown wrote:
Is it even possible to do optical out to 3 - 1/8" (3.5mm) stereo minijacks
on my 5.1 computer speakers?
Nope. The iMac's optical out is an AC-3 encoded digital feed, but your
speakers require six decoded analog signals. You need a 5.1 decoder --
something like FireWave, or a DolbyDigital receiver, or a speaker system
with a built-in decoder.
Looby

Audio Probelms with some DVDS/BLU-RAY discs when using optical out to Audigy 2

I have my PS3 connected to my Audigy 2 ZS soundcard via optical?cable to play 5. sound on my PC sound system (Klipsch Promedia Ultra 5.). I have finally successfully played discrete 5. sound with some DVDs. I have changed my optical out setting to bitstream in the DVD/BD menu (XMB) and selected optical with everything checked in (XMB). So far, The Matrix, The Matrix Reloaded and Minority Report have worked in proper 5. (not stereo matrixing). Both Dolby Digital and DTS tracks (I know it works because it sounds twice as good as Dolby?Digital) ?work in Minority Report. The problem is... Jurassic Park (DTS) and my Blu-ray MIssion Impossible 3 have no audio (probably more too). The STRANGE part is if I fastfoward both films by .5x (so that audio plays in FF) I can hear audio. When FF by .5x the display signal on the top of the screen changes from DTS or DOLBY DIGITAL: Multi Channel to DTS or DOLBY DIGITAL: 5..
What is with that?Also I still do not get audio in any games, Resistance (Blu-ray)?or any game demo but I do get the audio from the game display screen (XMB). Please if anyone has?any?useful advise or information it would be greatly appreciated.
?Thank you!

I have my PS3 connected to my Audigy 2 ZS soundcard via optical?cable to play 5. sound on my PC sound system (Klipsch Promedia Ultra 5.). I have finally successfully played discrete 5. sound with some DVDs. I have changed my optical out setting to bitstream in the DVD/BD menu (XMB) and selected optical with everything checked in (XMB). So far, The Matrix, The Matrix Reloaded and Minority Report have worked in proper 5. (not stereo matrixing). Both Dolby Digital and DTS tracks (I know it works because it sounds twice as good as Dolby?Digital) ?work in Minority Report. The problem is... Jurassic Park (DTS) and my Blu-ray MIssion Impossible 3 have no audio (probably more too). The STRANGE part is if I fastfoward both films by .5x (so that audio plays in FF) I can hear audio. When FF by .5x the display signal on the top of the screen changes from DTS or DOLBY DIGITAL: Multi Channel to DTS or DOLBY DIGITAL: 5..
What is with that?Also I still do not get audio in any games, Resistance (Blu-ray)?or any game demo but I do get the audio from the game display screen (XMB). Please if anyone has?any?useful advise or information it would be greatly appreciated.
?Thank you!

CD player Toslink optical out to optical digital audio in port. Need help

Hello,
I'm taking the Toslink Optical out of my Sony 707esD CD player into the Audio in/optical digital audio in port of my March 2009 iMac.
In System preferences>Sound>Input>Digital in Optical digital-in port I see a signal occurring on the input level meter but I do not hear audio.
Output is headphones port and is working fine from other sources.
I see a signal input does anyone know how to hear the output.
Thanks.

You need the free LineIn app from Rogue Amoeba.
http://www.rogueamoeba.com/freebies/
Dah•veed

Added SPDIF Optical out to MSI A75-G35 and I get no sound

Hello, I connected a TOSLINK cable to my Onkyo receiver in lieu of 2 channel analogue. I know I'm configured correctly on the receiver's end. I set up my realtek HD audio manager to send music via WMP to the receiver using the PC's optical output. The receiver is not recognizing any PCM signals from my PC. I even popped Skyfall in the PC optical drive. It plays the video just fine but the receiver doesn't even pick up the Dolby Digital signal from the movie. I get no sound from the optical output, period.
When I configure audio manager for an analogue signal output through my headphones, all is good. I change the settings to employ the optical output, and nothing happens.
I just want to play music on my home audio system via my PC mobo's add-in optical output. 1st, I had the latest HD audio drivers from the MSI website, which didn't work. Right now, I'm using audio driver version 6.0.1.7083, dated 11/5/2013
Also, I tested the optical cable on my cable receiver box to the onkyo receiver. No problemo.
Any other info about my system hardware or software that you need, just let me know.
Thanks for reading
MSI A75-G35 mobo/ BIOS VERSON 1.7, dated 11/07/2012
Win7 x32 bit
Audio controller hd Audio by realtek
Audio codec is ALC887

LOL No, I modified a toslink header bracket provided for an old DFI mobo. It's a simple 3 wire config(ground, optical out, +5V). Trust me when I say I got it right when I rewired the pinout. I have a red light passing through the end of the cable. The SPDIF header is a $15 option from MSI and shipping cost is $16 and change.

Optical Out "rumbles" on startup

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