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Author Thread: Digital out 3.5 mm (mono) to Digital Coaxial input
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Computer Guy
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How do I interconnect.

Digital out 3.5 mm (mono) to Digital Coaxial input.

Its a Creative Sound Blaster Audigy 2 and the Logitech Z-680. Anyone knows have an Idea?

Thanks
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alan
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any cable (analog or digital) will work.


Got to http://www.maplin.co.uk and buy an analoge cable
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Derek
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Use 3.5 mm to dual RCA adapter from Radio Shack. I would use one with a cable so as not to put too much strain on the jack. Digital Audio will be present on one of the RCA output.

Part numbers 274-369, 42-2550 or 42-2540
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Edit Post

I was wondering how to do the same thing with the exact same setup. I tried using 3.5 mm to Dual RCA's but sound only came out of the lef tand right front speakers and no others. ??????
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Edit Post

Can i connect an analog headphone to the digital out on my soundcard ?

Im using a Labtec Stereo Hi-Fi headphone and a Creative Sound Blaster Live 5.1 DE
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Anonymous
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heck no, you're outputing either a PCM stream or AC3 (dolby digital 5.1) from your digital out, and unless you've got a Digital to Analog Converter (DAC) in your headphones (i've never heard of it but i guess it could happen, but not with any cheap labtecs), you're going to just hear wierd noise, if that. the digital coaxial output on these cards is to go to a DTS/Dolby Digital receiver, which decodes the encoded and compressed information.
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Jeff
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Well, what about when you play a DVD on your computer? If it's encoded in Dolby Digital, I only pick up the music in the movie but no dialogue. I've got a DD and DTS decoding receiver so I know that's not the problem. Any ideas?
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Edit Post

I have Logitech X620, works fine on 5.1 PC sound card but I want to set up surround sound with my Sony stand-alone DVD. The audio output is coaxial. Is there an adaptor that will permit me to connect to my X620's. There is a games adaptor giving left right channels but I would prefer surround. Any ideas would be appreciated.
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Haider Gill
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You need a 3.5mm (male) to coaxial convertor. Maplin sell them (online) for £0.99 QQ66W 3.5mm Plg - Coax Skt. They also do a cable for about £1.50. Plug the convertor into digital out on your sound-card then plug a coaxial cable between your Dolby digital and or DTS receiver/amp. If your are already using your amp/receiver's coaxial input, you can buy a convertor to convert between coaxial to optical Toslink for about £20 (http://www.threedoubleyou.com/digital&fibre.htm) Digital Coaxial To Optical Converter REF: CPC:AV03254.
Your amp/receiver must be able to handle the digital stream being input i.e. PCM (all amps will handle this for general CD playback, computer music etc...), Dolby digital and DTS.
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New member
Username: Achispring

Post Number: 1
Registered: 12-2003
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Hi guys,
I am looking for a way, to do the same sort of thing, but for my car... So basically take the 3.5mm output directly from my MP3 player, to feed into the car amp, will this work?

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Unregistered guest
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Am I to understand that on my Soundblaster Audigy Platinum 2, I can use a 3.5mm (mono) cable input, converted to coax on the other end, connect it to my digital coax input on my amp, and get 5.1 sound from my home system? If so, where would I find the cable with both required ends or the appropriate adapter?
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Unregistered guest
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Hello!I was wondering if U could tell me how can I conect my soundcard SB live 5.1 to my reciever through a digital coaxial cable??Is that possible,or it`s just a dream?I tried with a 3.5 mm to RCA conector but all I am geting is a PCM signal.When I play a DVD it stays on PCM and it isn`t switchig to Dolby Dig.,is it somethings wrong with my settings,or simply it cannot be done!?Thank you!!
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New member
Username: Vgtvidz

Post Number: 1
Registered: Jul-04
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Hi, I actualy have the same problem as some people here... here's my setup
Yamaha receiver RX-V350
http://www.yamaha.ca/av/Receivers/RX_V350S.asp
5 satellites + 1 sub
Sound Blaster Audigy (1)
I'm using a mono RCA cable with a RCA to 3.5mm connector (mono)...

So everything's plugged and I only get sound from the front l/r speakers. I can also read PCM on the amp, this is pissing me off because I would really enjoy using all my speakers, Thanks if you can help!
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Anonymous
 
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Balaton and VCT-

Have you guys made sure that the options for the sound card have it set to 6 Speakers (5.1) and have the digital output only checkbox selected?
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Microsoft
Unregistered guest
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I don't think the audigy 2 supports 5.1 via digital.

my SONY Compact AV Home Theatre is connected to the audigy via toslink coaxial to optical converter.

And I've tried all possiblities (digital out only, all decoding options) but nothing seems to work.

I've sent creative several emails, they keep saying it'll work if you have AC3 audio file etc..

so basically you can't play games in 5.1 via digital in Creative products
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Whatasound
Unregistered guest
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I'm using a Yamaha HTR-5440. I take a stereo mini to RCA and one of the RCA's has a digital signal that I connect to the Coax on my reciever. All speakers work fine until I reinstalled windows, now both RCA jacks carry a digital signal one for the rear and one for the front. I can't connect them both at once. So how do I get back?
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Anonymous
 
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The Audigy/Audigy 2 or any creative SB with the digital output requires a MONO 3.5mm to coax cable (or RCA, same bit different name). The best way to connect this is by getting a 3.5mm MONO to coax converter then plugging a coax or RCA video cable (yellow) from the converter to the Coax input of any reciever (use the yellow not the white or red as coax should be no less than 75ohm for quality reasons).
You must select digital output only from your card options...also if you are using a DVD programme make sure you select SPDIF so your reciever decodes as opposed to the PC, this may require an upgrade with most DVD software players but is well worth it (if you have a good reciever to decode)
I have an Audigy connected to my Sony STRDA5000ES reciever using the above solution, before I was using 5.1 direct (3 x 3.5mm stereo to 6 RCA) and the volume was very low, now it is digital (SPDIF) the volume is unbearably loud where before it was quiet. The recievers blue S-master pro light comes on also when playing DVD from the PC indicating it is recieving a raw signal...hope this helps, I was looking for ages and finally decided to look at the online Audigy manual that clearly shows the configuration for connectivity to external recievers :-)
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Hitspam
Unregistered guest
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The Audigy/Audigy 2 or any creative SB with the digital output requires a MONO 3.5mm to coax cable (or RCA, same bit different name). The best way to connect this is by getting a 3.5mm MONO to coax converter then plugging a coax or RCA video cable (yellow) from the converter to the Coax input of any reciever (use the yellow not the white or red as coax should be no less than 75ohm for quality reasons).
You must select digital output only from your card options...also if you are using a DVD programme make sure you select SPDIF so your reciever decodes as opposed to the PC, this may require an upgrade with most DVD software players but is well worth it (if you have a good reciever to decode)
I have an Audigy connected to my Sony STRDA5000ES reciever using the above solution, before I was using 5.1 direct (3 x 3.5mm stereo to 6 RCA) and the volume was very low, now it is digital (SPDIF) the volume is unbearably loud where before it was quiet. The recievers blue S-master pro light comes on also when playing DVD from the PC indicating it is recieving a raw signal...hope this helps, I was looking for ages and finally decided to look at the online Audigy manual that clearly shows the configuration for connectivity to external recievers :-)
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Hitspam
Unregistered guest
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Oh Also, you have to change the speaker setup to 2 channel stereo (it does send raw 5.1 through the digital out)
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Unregistered guest
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Gentlemen...I have the same exact problem as whatasound does...playing doom3 made me realize that I was only getting 2 channels of audio to my receiver. I reinstalled all of the creative drivers, uninstalled them, and reinstalled them, and even though I unchecked the AC3 decode and checked digital output only, it is still sending out a PCM signal over the 3 SPDIF connectors inside the digital port on my audigy 1 (I can tell because left front/right front are on the left channel of my stereo mini to RCA and rear left/rear right are on the right channel...and when I back the mini plug out a bit with the right channel hooked to my receiver, I can hear "center" come out of the sub on the surround mixer testing program). Anyways, it is still decoding the AC3 from the audigy, and outputting it as 3 discreet SPDIF channels...not passing the full AC3 signal to my receiver through the top pole (as per this picture: http://dmzweb4.europe.creative.com/usenglish/audio/audigy/images/audigy_dolby_di gital.image1.gif ) even though I am turning AC3 decoding off in the surround mixer. Any ideas???? Thanks.

-rich
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Cory
Unregistered guest
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I can echo Rich's experience with Doom 3. In fact, in my case, utilizing the Radio Shack 3.5mm-to-RCA converter caused the L/R channels to be reversed. Ideally, what we'd all like is for the Audigy 2 cards to take all multi-channel material from games, etc. and encode it as a Dolby Digital signal to be decoded by our receivers. That's not what happens, apparently, unless your PC application is sending a Dolby Digital signal itself (i.e. DVD). Frankly, I'm extremely surprised that this isn't offered on a "flagship" product like the Audigy 2 ZS. The sound card market hasn't exactly had boatloads of technological breakthroughs and new features in the past 10 years...I would have expected that something like this would have been baked in for a while now.

Short of a driver upgrade or better explanation from Creative, it seems like the only reasonable alternative is to make analog connections between all 5.1 channels and your receiver, for those who have discrete multi-channel inputs, and let the card do all the decoding.
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New member
Username: Mattholme

Post Number: 1
Registered: Aug-04
Edit Post

I have the AUdigy 2 card as well.

What I want to know is if I need to get a special cable to use as my coxial out once it is converted to the 3.5mm jack. Or would an ordinary RCA work?
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New member
Username: Mattholme

Post Number: 2
Registered: Aug-04
Edit Post

Actually, let me change the question.

Is there a diference between a coaxial cable with rca plugs on each end... and an AV video cable with RCA plugs on each end?
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Unregistered guest
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How can I conect the external front jacks of my case? theres a "out" and a "mic in". Please help-me
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Anonymous
 
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Hello, I have read what you guys have written but the issue stands still:

I have Audigy2 with a 3.5mm digital output jack and a YAMAHA TSS-1 speaker system (with a "reciver" included") which has only coaxcial and optical input jacks. I have got a 3.5 to coax converter (the 3.5mm has only 1 black stripe on) and still after connecting i get sound only from the front left and right speaker.
After doing a soundchack (where each speaker says it's location in his time) i noticed that only the front left and front right responded at all...

Any ideas? was thinking maybe i need a 3.5mm converter that has 3 black stripes maybe...
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White^Fang
Unregistered guest
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Oh and plz, make it as specific as possible
(pics of the needed parts would be good as well)
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tsesunku
Unregistered guest
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i'm having the same problem. audigy 2 zs to logitech z680. i have digital output only checked, 3.5mm to RCA adaptor connected to digital coax to receiver, only sound out of left and right speakers. anyone able to get all 6 speakers to work?
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White^Fang
Unregistered guest
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I have just noted something, apperantly the issue is that the "reciever" (TSS-1 YAMAHA) does not support AC3 (it supports DTS and other dolby digital stuff but not AC3).

Is there a way to conenct em both using the digital mode?
* I also noticed something about SPDIF, but have no idea how to use it...
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Bronze Member
Username: Arnold_layne

Madrid
Spain

Post Number: 70
Registered: Jun-04
Edit Post

White^Fang, AC3 is the implementation of Dolby Digital multichannel for consumer products. Your yammie should indeed be compatible.

"Sony/Philips Digital Interface" a.k.a. S/PDIF is the formal name for coaxial digital interconnect. Optical version sometimes called Toslink (invented by Toshiba). To use it is just to decide what to send: DTS, DD or PCM. And to make sure receiver recognize what's coming through.

Cheers
AL
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Unregistered guest
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I have a grundig Lenaro television (with integral speaker system) which has a digital 5.5mm coaxial input and I want to connect it to my cable STU which has a RCA SPDIF output. What cable/ connection do I require
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Unregistered guest
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I have a Turtle Beach Santa Cruz.. they say to hook up a 3.5mm to left/right RCA cable but to just plug the red RCA into your coaxial input on your receiver.. i've got mine setup and can play dolby digital dvd's through powerdvd
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White^Fang
Unregistered guest
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Is there any way to connect a 3.5mm digital output jack to an optic input jack?
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Nocturnal
Unregistered guest
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What a mission! I'm in the same boat as most of you guys having trouble with the 3.5mm -> coax output to digi amp. I've been reading endless discussions on forums all over and this is what I've figured out/theorised to date (and will try tonight at home)
I tried the original 3.5mm digital minijack to mini-din and rca(coax) from the Creative online store - I tried this with every possible config on my Live 5.1 DE card, but to no avail (even tried getting an optical connection working through the SPDIF out pins on the card) - except 1...

Someone on this thread mentioned DEACTIVATING AC3 decoding, and ACTIVATING digital output only on the SB LIVE series for it to work, BUT also mentioned setting your speaker config to 2 speaker config. This makes sense, as the SB LIVE series maps the analogue out centre/subwoofer channel to the digi minijack in 5.1 mode. Try that guys, it just might work - as it is my last option to try also before the proverbial skin-of-my-teeth is about to break in search of a solution.
White^Fang: You might want to try the 3.5mm minijack -> coax, and then adding a coax -> optical (toslink) converter onto that IF the aforementioned theory proves true. You can also make an optical converter (which is so simple that I still can't believe it.) by checking out this link: http://www.minidisc.org/cdrom_opticalout.htm
I hope this helps...
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New member
Username: Ltburch

Chicago, IL
USA

Post Number: 1
Registered: Aug-04
Edit Post

It is not an ideal solution for 5.1 audio but it does work. I have a SB Audigy and if I do set it to 2 speaker config using with decoding disabled and a 3.5MM mono -> RCA plug and connect that to my dolby digital decoder and setup my DVD software to use SPDIF (power DVD) I do infact get 3/2-1 (aka 5.1) output on the coax line.

However this also means that the SB thinks I have two speakers so everything else having to do with surround sound will not play using my full compliment of speakers.

Because of this I will be returning my fancy new sound card and going back to my old SB live since basically all this soundcard can do is be a passthough and even a card with no fancy features can do that.

Anybody know if there are any sound cards which work well with external decoders?
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Anonymous
 
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I use Audigy 2 with win2003 and it has no problems to pass-through the AC3/DTS on the S/PDIF out. I use a 3,5 stereo+video cable with 3 rcas. For games I have to use analog output, but if you are extremely rich, you could buy the DTS CAE-4 (USD 5000) real-time encoder to encode the discreet digital 5.1 output from audigy 2 into a dts stream which you can feed to your receiver. :-)
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Phyrhk
Unregistered guest
Edit Post

Hi.

I have read this thread with great interest, but have not found the answer to my own problem. I connect to my Yamaha DSP-A1 via a 3.5mm stereo cable. I do not get one sigle sound out. Anybody got an idea how this could be?
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Vanquish
Unregistered guest
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does anyone know why i dont have the option to turn on/off AC3 decoding? (surround mixer)

ive just got a SB Live 5.1 digital and no matter how much time i spend messin about with the setup i can only get sound from the front and left speakers.

ive got the creative inspire 5.1 5500 surround sound decoder n speakers and it doesnt switch itself onto dolby digital by itself and when u select dolby prologic it doesnt split the sound up right?? :-/
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Vanquish
Unregistered guest
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sorry that should say "front left and right speakers"
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Unregistered guest
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Hmmm....... on the subject of 3.5mm jack SPDIF to RCA.....does anyone at least know where this cable can be bought? It's rarer than the unicorn.

The only jack plug I've ever seen with 3 stripes (5 partitions) was in the creative PDF manual.

I've looked everywhere.... but it seems it only exists on creative digital speakers.

:rolleyes:
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Anonymous
 
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For those of you who have posted to this group, I hope this information will help you.

In reference to the original poster, to hook up a SB audigy card to an amplify using the digital output, you just need a cable with an RCA plug on one end, and an 1/8” (3.5mm) mono plug on the other. This cable is usually quit easy to find. You can buy them at dollar atores, audio shops, or can usually find adapters that convert an RCA plug to the 3.5mm jack. The cable itself is pretty much not that important, as digital signals are less prone to “noise”, however severe degradation will result in spotty digital data, and therefore broken sound, so a really crappy cable might cause problems. You can use a coaxial cable, video cable, audio cable, whatever you want to call it, but as long as the physical ends are as mentioned, you are in business. That is the good news.

Now, the bad news. For those of you hoping to hook up your nice fancy sound cards to your nice fancy amplifiers and speaker system, and get all the latest goodies without changing settings/cables etc, forget it. You are SOL. * special case exception. This is not to say that things won’t work, it just means that there is not ONE setup, that will get you everything. This is due to the goofy way these sound cards are set up. Even though your amplifiers may support several different audio signal inputs, and the sound card can also support several different signals, the current implementation won’t allow all your gear to play nice.

If you simply want to get digital audio (5.1), using the above cable, make sure you change your sound card settings to use digital output only(find it yourself), make sure AC3 encoding on your Sb is on (another word for Digital), and make sure you set it up for two speakers (yes, two). If you try to set it to a 5.1 speaker system, you will only get the left and right audio. This is caused by stupid drivers that assume that if you have selected any more than 2 speakers, you must be using the SB as the digital decoder, and outputs the signals via the independent speaker outputs on the card, even though you have specified digital output. The end result is, with the above settings (you might have to tweak your independent configuration) you will get Dolby Digital 5.1 from your sound card, into your amplifier, and it will sound great. However, because you need to set your sound card up as a 2 speaker (stereo) configuration, your computer games will not play in surround modes properly, simply stereo. Few games (if any) support dolby digital, so you will just have to listen to them in stereo. That means Doom 3 is stereo only. Sorry.

* exception. Two possible ways around this, are, to forget about using your amplifier as the Digital decoder, and to hook up the SB card outputs to you amplifier using the individual channel inputs, ie front to front, center to center, rear to rear. If you are lucky your amplifier can do this, and in this case, you turn your sound card digital output off, select a 5.1 speaker setup, and you will hear your movies in 5.1 dolby digital, AND your computer games will also play in surround modes. Of course, for purists, there will be an audio degradation as you will be sending an analog (converted from digital by your sound card) signal to your amp instead of a digital one, and the wiring is much uglier. Plus, you will have to use the SB software to adjust levels, sub cutoff, etc. it also may limit what other gear you can plug into your amplifier as all of the inputs may be used. But it does work. The second, as mentioned by another poster, is to spend gobs of money on a seperate digiatl encoder, and feed your sound card signals into it, then into your amp.

The solution to this, would be if the sound card converted non digital signals (including surround modes) and converted them to dolby digital. Then, you could have it all, but I have not yet found a card that can do this, maybe some day.

Hope this info helps.
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Anonymous
 
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Hi.

I have everything working fine (3.5mm jack -> RCA) with my Yamaha amplifier, BUT I have to turn the volume up extremely loud to hear anything. I use WMP10 and am clueless to what might cause this. Anybody know how this could be fixed?
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Simania
Unregistered guest
Edit Post

Hi,

The story of the guy posted on the 6th of september is perfect.... But for the people who have a SB Audigy 2 and want to watch movies via their amplifiers in Dolby Digital or DTS, make sure that the internal decoder function is set to off....Go to the 'AudioHQ' menu via the control panel and then to 'Device Controls'. Find the Decoder tab and select SPDIF Passthrough to on.

Hopefully this helps and let's all pray for DTS/DD game support......

Ciau
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CoZMoSiS-UK
Unregistered guest
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I feel inclined to comment here after feeling sorry for everyone having problems...

Those of you trying to take the digital signal out the back of the pci card on the Audigy2 (and i think the Audigy as well) are in for a slight dissapointment im afriad. Creative purposely altered the attenuation of the digital signals to all but the FL/FR channels so you will ONLY be able to get all channels on Creative speakers.

I was in the same boat as you lot several months ago til i found that out, and the only solution is to either use a Creative speaker package (yeah right) or spend all the more money on the Platinum version of the card, which you can then use the digital output on the external I/O interface - which i have been told works perfectly tho i have not personally had the chance (or funds) to try yet.

Whilst you can mess around and get it working for dvd's as it can output a raw signal, im afraid you just have to give up making it work for games etc. too.
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New member
Username: Ltburch

Chicago, IL
USA

Post Number: 2
Registered: Aug-04
Edit Post

So you are saying that, to your knowledge, if you get the platinum version of the card then you can output 5.1 digital to an external dolby DTS decoder for all functions not just DVD playback?
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CoZMoSiS-UK
Unregistered guest
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Yes indeed.

Also after having a look on Creative's site i never noticed before but it even says so on the specs page for the Audigy 2:

http://us.creative.com/products/product.asp?category=1&subcategory=204&product=4 915&nav=technicalSpecifications

to quote:
Sound Blaster Audigy 2 ZS On-Board Connectors
Line level out (Front / Side / Rear / Center / Subwoofer)
Digital Out for 5.1 support (6-channel SPDIF output to Creative digital speakers)

The _ON BOARD_ 5.1 support is only designed for thier own line of speakers. If you look at the specs of the platinum, the external I/O module has optical outputs on it and it mentions nothing about only being for thier speakers.

Interestingly, the specs of the ordinary Audigy 2 dont mention anything about the back panel output being only for thier speakers, but as so many people so it doesnt work so we can assume that its the same case. Also, isnt it a bit coincidental that the only people having problems are those with a standard card trying to use the onboard digital output ?

I'm gonna confirm with a friend of mine next time i speak to him as he has a platinum and i know uses the optical output on the external module, but no doubt he will confirm what all the evidence points to.
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Unregistered guest
Edit Post

Here is an answer from Audigy that might help people out:

Thank you for contacting Creative Technical Support.

With reference to your email, please kindly be informed that the
Creative Sound Blaster Audigy and above series of sound cards do support 5.1 digital sound output.

Please access the link below for a detailed technical specifications of
the sound cards:

http://us.creative.com/products/welcome.asp?category=1&

I am very sorry for the inconvenience caused.

Please email back on the status concerning the issue so that I can
assist you further. Thanks

For faster service please reply with previous correspondence when
replying to this email.

Best Regards
,

Rachel Low
Technical Support
Creative Labs Americas
"Get Creative"
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New member
Username: Ltburch

Chicago, IL
USA

Post Number: 3
Registered: Aug-04
Edit Post

The as stated above the question is not if it supports 5.1 surround on the digital out but if it supports 5.1 surround on the digital out in a matter compatible with external DTS decoders such as home theater systems/external amplifiers. Experiments have shown that at least the Audigy line below the platinum only support 5.1 surround on the digital out to an external decoder when dealing with a SPDIF source such as a DVD. An experiment with the platinum is pending. All other times the digital out to an external decoder only supports 2 speakers.

The key here is the external decoder, I fully believe the card will output 5.1 to their own line of speakers (and maybe some other manufactures speakers) but not an external decoder.
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Art Saxby
Unregistered guest
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I can get everything except dialoge. I have followed everything above and can get great sounding surround music from my PC to my home theater system. My home theater system shows it is getting a digial signal and even recognizes DTS. But I don't get any dialoge in a movie.

Can anyone help?
Art
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New member
Username: Wardak

Post Number: 1
Registered: Sep-04
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I found this thread while looking for a solution to a problem getting 5.1 out of my Audigy2 and a coax digital connection. I found the fix for this and wanted to share.

Basically I was going for the 5.1 pass-through using PowerDVD 5, an Audigy 2 Gamer (no "Live Drive"), a coax output and an Onkyo 6.1 home theater system (with decoder built into the receiver). I wanted 6.1 (Dolby/DTS EX) for the movies, and channel for my regular Windows stuff, with the ability to use my headphone/microphone all without a bunch of clicking on sound settings everytime I changed applications (the analog 5.1 connections required me to change my control panel settings for each application--and denied me any use of the rear center 6.1 capability because the receiver didn't have an analog input for that channel). I use the headphones 50% of the time, and the amp'd sound the other 50%. This offers no capability that I have seen yet to get 5.1 out of games or whatever (not a factor for me really). I'm not sure I have any games that are capable of this...

SW settings are like folks have already said: Creative Audio HQ-->Device Properties-->Decoder = SPDIF passthru. Creative Speaker Settings -->2/2.1, Synch with control panel, Digital Only. PowerDVD audio config is SPDIF. I feel like I tried all this already, but didn't see it working until now (was always stereo PCM at best)--maybe one of them was off or something. This lets everything in my Windows environment be 2-channel, except DVD playback which gives the 6.1 stuff--on my receiver I do have to push the "surround" button to get the receiver into multi-channel mode, otherwise it stays stereo-only. The receiver kicks straight back to stereo when I shut down PowerDVD (it senses the tremor in the Force or something...)

None of the "speaker tests" in Windows will show all the channels working. My indications for success were hearing the good stuff, and seeing the correct things on the receiver info display. Bonus here is that the digital output in the stereo mode is decoded by the receiver to give me the 2.1 subwoofer action--so even stereo sounds better now. Nothing new really I guess, but the directions are not clear at all for this and I was beginning to wonder whether the Audigy2 was capable of this via the coax at all, thankfully it is. Also works for 6.1 from PowerDVD in HDD mode.
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JasonH
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CoZMoSiS-UK

Any luck yet?
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Anonymous
 
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This forum has been very helpful to me in making a decision regarding a new speaker setup for my computers. I thought I'd throw my own experience into the ring.

I bought a set of Logitech Z-680s to use as a combined speaker system for my PC (Audigy 2 ZS sound card) and my Power Mac G5 (built-in optical digital out). I hooked up the speakers as follows:

1) Optical Out on the Mac to the Optical In on the speakers
2) 6-channel Analog Out on the Audigy to the 6-channel Analog In on the speakers
3) S/PDIF Out on the Audigy to a mono-to-RCA adapter, then digital coax to the Coax In on the speakers

In Control Panel\Audio HQ\Device Controls\Decoder, I set the Decoder Options to "SPDIF Passthru". In the Speaker Settings and THX Console, I deselected "Digital Output Only", so that both the 6-channel and the digital outputs are active.

I'm using Intervideo Home Theater on the PC for movies and TV viewing, having selected "S/PDIF" for the sound source. TV plays back in Dolby Pro Logic II, and DVDs play in Dolby Digital (the Z-680s switch decoding sc