Audio out - without a hum.

When I connect a audio cable to a stereo receiver, I get a pretty loud humming noise. I had the ame problem with my G4. Now, with this new MacPro, I see that I have options for audio out. Digital/optical and audio line out. Does anyone have a suggestion for the best way to go - to connect to my home stereo system - and not get the humming noise?
Thanks.
nÔÔdle--hëad

This is a common complaint, I think. My MP I don't know about (just shipped today), but with my G4 MDD the line-out is a bit noisy, particularly with Nap mode enabled (as it usually is, keeps those fans down a bit and really helps the temperatures)- that always causes distortion on my setup. I've found my Griffin iMic to give somewhat better results, nice clean sound all the time. Digital-out I imagine would be even better, but I don't know how well isolated it is from other system noise (like the iMic is on USB).

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Audio out- Without noise??

I'm having a miserable time trying to get music from my Mac Pro to my home sound system.
I tried digital - and I get loud humming.
I triedaudio out, and I get mostly the same thing.
I bought a modulator to reduce such hum. It helped but I still get annoying humming.
Can anyone tell me why this simple thing is not working?

I have a ground loop isolator. It still hums.
I am now trying using the digital out port, connecting in to my optical digital in on my stereo receiver. That works better. However, the thing about that which dives me nuts is there is no way to control the sound from the mac without going into system preferences, sound, and using that panel. Even just to change the volumn. This is very clumsy. Any ideas of a way around that?
noodl<<Font face="BlizzardD">ehead»

Audio in is working, but no audio out on internal speakers (with or without headphones.)

Audio in is working, but no audio out on internal speakers (with or without headphones.)

Reset PRAM. http://support.apple.com/kb/PH18761
Reset SMC. http://support.apple.com/kb/HT3964
Choose the appropriate method.
Best.

How do i disable audio out timeout on a macbook pro causing noise on external amplifier, without having a silent .wav playing in infinite loop?

After updating to Mavericks I have this problem. From what I guess, my audio out (either the signal, or the entire soundcard) cuts power after being idle for about 30 seconds. This results in a static noise when connected to my external amplifier. From various forums, dating back to 2007/8 I can see this is not a new problem. The only workaround is playing an empty .wav sound on infinite loop (either by using a terminal command, or by a third-pary app which does this for you), preventing the audio out from timing out and cutting power. This seems to me to be an undisirable proceeding. Even if minimal, it uses extra power and memory. Is there any way to prevent the sound card from timing out like this?

Ok. I tried disconnecting the charger from my macbook and that actually helped. The noise is now so low it is hardly audible, so I guess it has to do with a ground loop. But still, even when hardly audible it still only happens after 30 seconds of idle time. Is that because my theory about a timeout is correct, or is there some other reason for this? This used to just happen when my macbook went on standby (sleep), but now it happens allready after 30 seconds, so even though it may be a loop, it wasn't like this before. I'd love to understand what is different now.

How do i replace video without putting all of audio out of sync?

hello,
i am trying to replace a video clip with an alternative clip while keeping the original audio, but everytime i select a clip to replace, it does so but puts the audio out of sync starting from where i inserted the clip...help!
Thanks,
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First, go into iMovie/Preferences and make sure that the Advanced Tools are enabled.
Next drag and drop the alternate clip from the Event to the frame in the project where you want it to start. A pop-up menu will come up. Choose "Cutaway".

Audio out from HDMI port?

I have connected my TV and Booklet via a standard HDMI cable. This same HDMI cable works fine with my DVD player. When I use it with my booklet, only video seems to be sent to the TV via the HDMI cable. Is the HDMI out port supporting only video, or audio as well? I understand the booklet supports HDMI 1.2, which should support an audio profile, as far as I know.
Let me know if you have been able to get audio to work over HDMI.
thanks,
John

I found your discussion attempting to find the answer to the same question.
I won 5 of these things at auction and wanted HDMI to be a selling point
I researched far and wide and now I think I have the answer now.
I had to reload the OS and all the drivers for all 5 units
I read some of the replies to this topic and with some people saying that they had audio and I didn't, I felt that either I was crazy or someone is not truthful. so i had a thought ,
after about the 3rd unit I tried to just try to hook it up to a TV bare without Nokia updated software
What do you know, it worked.
So I have come to the conclusion based upon using both units after testing them with and without the update, is with the stock driver provided, you will get the audio from the HDMI port; if you update the software from the updater(which I noticed it says the driver is MANDATORY)
You will not.
There is a plus and minus on both occassions
With the graphics driver update you can scale your video once hook to an HDTV to full 1080p HD; but you wont get any audio (at least for now)
Without the update you will get the audio out , however you will only get the same native resolution as the netbook 720p
So contemplate which feature is more important you and make your choice.
Higher picture quality(full HD) with the driver yet I need 2 cable (HDMI AND 2.5 to RCA)
OR lower resolution720p but audio as well
I hope this helps but i see my next challenge for both you and is to see if we can roll back the driver if we want audio over HDMI.

Trouble running DVI video and HDMI audio out of 6950

Twin frozr iii 6950 2gb (X2 crossfire)
Asus VG236 Monitor
Windows 7
MSI P67A-G43 Motherboard
Yamaha RX-V371 Receiver
I have two Twin Frozr iii 2gb 6950 cards and am attempting to use the HDMI on the video card solely for 5.1 audio out to my receiver while using video through the DVI jack of the same card directly to my monitor without success.
-Audio functions if I run the HDMI from the card into my receiver, then out to my Asus VG236 monitor.
-Audio functions when I run from the card to my receiver then out to my plasma tv.
-Audio functions if I have the DVI run directly to the Asus VG236 monitor and HDMI to the receiver then plasma tv (only in dual display and the tv must be on for audio to function this way. If I turn the tv off even though the receiver is still on the audio stops working and windows sound lists the 'AMD HDMI Output' as not plugged in).
-Audio even fuctions when I run DVI to the monitor and HDMI to the receiver, then out to the HDMI port on the same monitor but the monitor will only run at 60hz this way even when DVI is selected on the monitor, as though it defaults to the HDMI when dvi and hdmi are both plugged into the monitor.
And if i run the hdmi to the receiver "HDMI IN" port without using the "HDMI OUT" port from the receiver to anything, like my tv or monitor, the sound doesn't work and in windows sound the "AMD HDMI Output" is listed as "not plugged in" .
I purchased this monitor for the true 120hz capabilities, the HDMI on this monitor doesn't support 120hz, the maximum is 60hz. DVI is required to run at 120hz. I don't see any option in windows sound settings or CCC to resolve this.
I have also tried disabling onboard audio in BIOS with no effect.
For now i'm running the audio out my MOBO jack through an optical cable to the receiver but optical only supports 2.1 sound.
Any suggestions you can offer would be appreciated, thank you

bump,
Anybody?

Version 1.1 and audio out via USB problem

When I attempt to use headphones to assist editing, I prefer to use the m-audio USB transit and set my sound preferences for the iMac accordingly, but STP in my case does not work at all. Instead, I hear clicking ( about 1 sec intervals), followed by STP freeze and unless I force quit, my system freezes.
If, on the other hand, I use digital out, or a FW interface or the iMac's speakers, all is well.
I am more than mystified since FC readily works with the USB pathway with video/audio , thus allowing me to use the FW ports on this limited platform.
I have trashed STPs preferences without any result. I also cannot find (or do not know where to look for) STPs specific preferences for audio out. I apologize in advance for failing to find the reference in the manual, if that is where it is and those settings are the issue.
Any help and suggestions are greatly appreciated.

At the risk of seeming to be talking to myself, I can report that I have found a solution to the problem I posted. To be more precise, Apple did,some time ago.
For those who are curious:http://support.apple.com/kb/TS1464
Thanks to all who looked in. I hope it is useful for someone else, too.

Getting an Analog (RCA) audio out from Apple TV 2

I have an extra Acer X203H (DVI-D with HDCP) that doesn't have any speakers. I want to hook up a new Apple TV 2 to it so I can stream Netflix in the bedroom without having to buy a TV. So, here's the question:
I am certain an HDMI to DVI should work, but I don't have a solution for audio. Converting optical audio to RCA appears to cost around $100 for the equipment but I'd like to avoid that if all possible. Any thoughts or ideas would be great.
Thanks!

You need an HDTV, this is a computer monitor, correct?
Then you can either hook it up directly, sound output would be through the TV. Or you could hook up a receiver via optical. If you have an analogue receiver you can buy an adapter or route through the TV if there is an audio out port.

A/V Composite cable video but no audio out

I just bought a new A/V composite Apple cable for my iPhone. I plugged it in to an LCD tv when I got home, and it WORKED with all the videos I have on the iPhone. I then (without unplugging) tried to play a song from the iPhone (purchased from ITMS). No Sound out.
Then I went back and tried to play a video again. Video out, no sound out!
Then I tried several un plugs and replugs, I tried a full shutdown and reboot of the iPhone. All with no effect. Now pictures and video still go out, but no sound out of the cable.
Questions:
1) Does anyone have a solution to this? Cable wasn't stressed or anything-and works with a different iPod Nano.
2) Shouldn't the iphone put out audio through the A/V composite cable using it as an iPod?
3) Although the iPhone asks, when starting a video with the cable plugged in whether you want to play on TV or not, is there any selection that needs to be made to get audio out from song files (just ipod sound out?)
WSKCONDOR

*However, it doesn't explain why after returning to video the TV sound was still not present.*
If you mean you first tried to play an audio only file and then switched to an audio with video then it's most likely the TV was still shut down on that input. Try this (with the previous scenerio): after you're sure the iPhone is outputting both video and audio (with a movie, for example) just switch the TV inputs until you're back to that signal and I'll be it will show things again.
Once again, I think both the iPhone and the TV makers are culpable, but it's a shame the iPhone doesn't output the album art because this is what it does when you play it standalone. It just makes sense -- that fact it doesn't is a kind of "duh" (unless there are technical issues I just don't understand -- possible, even though I'm a programmer). But all of us who want this should go to feedback and post it and perhaps it will make it to the next release (I've asked for this about three times now).

Iphone digital audio out

Is there any way to get hold of the digital audio from an iPhone 4S without buying a dock? I was planning on getting an FiiO E17 portable dac/headphones amp, so keeping it portable, I wish for a simple solution which fits with this.

Yeah, Ive been looking at the pinout and Im guessing it is possible to get digital audio transferred through the usb pins, but how to initiate that? What protocol and what language? Or is there some simpler way to initiate audio out? Id really like something simpler than building my own controller box, but if that is what it takes, then...

Connecting audio out of TV to sound c

Hey,
I have the audigy 2 platinum card. Today I connected the audio out from the tv to the sound card. What I got was some background noice and a delay. What ever was being said through the tv's speakers would come out through the computer's speaker with a second or two of delay. Basically I connected the cables to the tv's out and to the aux 2 in. Am I doing something wrong? Is there another way to connect the sound to come out through the computer's speaker without the delay? Thanks in advance for the help.

Are these articles any help?
http://docs.info.apple.com/article.html?artnum=300251
http://docs.info.apple.com/article.html?artnum=300270
Incidentally, if you have any future questions about your iPod video, can you post in this forum http://discussions.apple.com/forum.jspa?forumID=808 as the forum you are in now is for older non colour iPods.

Connecting to iMac optical audio out/ overall audio quality?

Just curious if anyone has done this yet? The iMac says it has optical audio out through the headphone jack but without an adapter I can't see how that's possible. My speakrs accept optical audio in and I really want to connect them to my future iMac. If not, how's the optical from the headphone jack? Is it possible to get 5.1 surround from that port?

firefighterpilot1 wrote:
The iMac says it has optical audio out through the headphone jack but without an adapter
I can't see how that's possible.
There are two "standard" optical-digital-audio connectors -- the original "square" one is
still used in most larger audio/video components. The newer/smaller one, used mainly in
portable gear, is exactly the same size as a mini headphone plug. The iMac's audio jacks
support either analog or digital-optical connections -- depending on which type of plug
is inserted.
Radio Shack carries adapters/converters/cables of both types (usually at outrageously
high prices). For online vendors, try http://monoprice.com -- great prices and a good
reputation for quality/service among the HDTV-fanatics on avsforum.com.
http://www.monoprice.com/products/product.asp?cid=104&cp_id=10423&cs_id=1042301&pid=2671&seq=1&format=2
Is it possible to get 5.1 surround from that port?
http://www.thismuchiknow.co.uk/?p=24
Looby

Switching Core Audio Drivers - No Audio Out

I have a project in Logic Pro 8. It was recorded with Presonus Core Audio drivers on a Powerbook. The Project was then handed off to me to complete here in the studio.
I re-opened the Logic Express Project in Logic Pro 8 using Digidesign HD hardware and Digidesign's Digidesign HW (HD) Core audio driver. All was well.
We decided to try some changes in routing, using some new equipment M-Audio (ProFire Lightbridge) to take advantage of some Apogee I/O units in the studio. Loaded up the M-Audio Core Audio Drivers (ProFire Lightbridge Multichannel), made sure everything appeared properly in the Apple AMS (Audio Midi Setup) panel and did test tracks in Logic. All was well still
Then I opened the Project, which had been working in Logic 8 and interfacing with the Digi HD hardware, now using the Lightbridge Multichannel driver to access the Apogee I/O, and...no audio.
No indication of activity on the hardware interfaces. I checked Logic 8, onscreen everything appeared normal. Channel meter activity. Channel routing remained unchanged and should have appeared at the appropriate D/A convertor. Digital activity which would have normally been indicated at the ADAT to Firewire interface was non-existent. So, I would deduce that the computer was not directing the Logic channel activity through the new driver to the firewire interface from this project.
I rechecked the test project with tones. I/O activity normal. Audio out. I opened another of the series of sessions from Logic Express to Logic using DAE now using the M-Audio interface. Nada. No firewire/ADAT activity?
I have reverted without problem back to using the DAE/Digi Core Audio model with no problems, but I would like to get the ADAT/Core Audio model running on these same projects as a proof-of-concept, and see no reason why it shouldn't.
Opinions, suggestions, ideas, questions?
...JB
Message was edited by: J A Bohrer

When I was on the phone with M-Audio Tech Support (they're quite helpful) we noted the following:
1. If you switch over to Core Audio using the Mac's Internal speaker in one of these projects (switch to Apple's internal Core Audio Driver). All Channels are immediately updated to show only Output 1-2 available. and the project plays through channels 1-2 and the MacPro Speaker.
2. Switching back to DAE Core Audio, all available channels are updated and all plays/records normally using the Digidesign HW (HD) Core Audio Driver.
3. When the ProFire Lightbridge Core Audio Driver is selected, all channels are updated (now 1-18) and available, but if you select a channel or channel pair on one of the Channel Strips that was not in use previously in this session, an "out" bus for that channel is not created in Logic (which it normally does, assuming you choose a new channel pair for output from a channel strip...)
When a 'new' project is created with the Lightbridge setup selected as the Core Audio output, all channels will auto create an appropriate channel output strip.
My problem only exists when opening a previously created project. (In this case using DAE Core Audio...and I'm not implicating that as the cause, I don't think it is.)
It's like having previous sessions/projects, buying new hardware to improve your ability to work with them only to find out you can't use your new stuff with the old sessions. (Not like that hasn't happened before.)
Either Logic is at fault, not being able to accomodate the driver change from DAE to M-Audio, or the M-Audio driver is, being unable to get Logic to update its Environment to accomodate the new channel availability.
...J
Message was edited by: J A Bohrer
Message was edited by: J A Bohrer

After Effects rendering the video with the audio out of sync

so, the thing is, i did the animation on flash, exported it, put it on after to edit audio and what not, everything looks fine, previews are good, so, lets render!... every time i render the final video have the audio out of sync, specially the audio that is already on the first video. the video its originally on 12 fps, if i change the interpretation to 24fps, everything get worse. any help?

ok, both Flash and After effect are CS6, i have a Lenovo Ideapad, can handle 64 bits
first i exported the video on .MOV from Flash CS6, without any problems
Then i finished the edition on After Effects, everything look good.
i have tried to render it on MOV, AVI, MP4 and the audio for the video that was exported from flash always get out of sync. i dont really move anything else

Audio out - without a hum.

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