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Surround Sound through Digital Decoder

by Azrael808 / October 9, 2005 7:32 AM PDT

Hi everyone,

I have a PC that uses the Asus P4C800-E Duluxe mobo, and a Creative Labs DDTS-100 Digital Decoder with the Creative Inspire T7900 speaker system.

I have been trying to use the SPDIF output on the mobo's onboard audio card to connect to the DDTS-100, rather than the standard 3-plug cable.

I am getting some audio using this setup, but it's not working as it should. If I perform a test on the DDTS-100, all the speakers function properly. However, when using the SoundMax Utility in Windows XP (latest version, from the Asus website) to test the speakers, the sound channels seem incorrectly configured.

As the music loop is played, sound seems to come from the left and right front speaker, but as the sound circles around, the rear speakers do not produce any sound. The effect is that the music just fades out, then fades in as the sound comes back around.

It doesn't seem to matter what mode I set the DDTS-100 to, the same thing happens for each.

Does anybody have any idea how I can get this working? Or why it might not be working properly? I thought that the signal coming through the SPDIF cable would be fairly standard, but I am not sure now.

Thanks in advance,


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creative T 7900 speakers
by gdprasad / July 17, 2008 5:16 PM PDT

I am in deep trouble.
I happend to buy T 7900 creative speakers , what ever I do my on-board sound will not play all these speakers.It plays only front L&R,
Sub woofer gives more vibrations than actual sound.My mother board is GIGABYTE GA-G33M-S2H,claims to support 7.1,( Integrated ALC889A 8-Channel High Definition audio with DTS support ) has 4 audio out put sockets on the back panel, and 1 audio out put socket on the front panel,which the manual claims to support saparate streaming,7.1+2 Channel High Definition Output
(The ALC889A provides support for 7.1 sound playback, plus 2 channels of independent stereo output (multiple streaming) through the front panel stereo ) Would some one help me please to configure these speakers, or is some thing else I need.My pc runs on xp service pack 2,and sound driver is Realtek HD, microsoft UAA.
Thanks in advance guys.

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check your speakers and then your onboard audio
by Akimo / July 21, 2008 12:08 AM PDT

You can very easily test if the speakers are the problem or not.

1. Disconnect subwoofer from the computer - unplug all four cables.
2. Take an ipod or an mp3 player and one of the jack-to-jack cables and connect headphone out on the ipod with the input number one marked green on the subwoofer. Once you hit play your front speakers should play.
3. Then you re-plug the cable on the subwoofer - plug into the black input now. Hit the play button: your rear speakers should play now.
4. Re-plug the cable on the subwoofer - plug into the grey input now. Once you hit play your side speakers should play.
5. Finally re-plug the cable and test the orange input. Once you hit play your center front speaker should play.

If all steps 2-5 work the problem is not with the speakers only with the onboard audio configuration.

If at any stage the test does not work it might mean the problem is with the speakers - or the cables, but you can narrow down what the problem is.

To me it seems likely that the realtek is not properly configured for 7.1 or it is not properly connected with the speakers. Maybe you have it set up for a digital connection etc? It should be analog 7.1.

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