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PC -- AMP 5.1 problem (coaxial)
gsg 
2/8/08 8:38:24 AM
Serf
Hi guys,

Recently jus updated the PC and put in a P5Q motherboard with Digital coaxial audio output instead of the spdif. My motherboard supports up to 8 channels (seperate colored outputs on the back), but i read coaxial does 5.1 also. So i hooked it up to my Marantz amp, but the darn thing only detects the left and right channel (stereo). The centre, and surrounding speakers arnt recognised by the onboard audio software which is set to 6 channels. The motherboard doesnt seem to detect the channels when i do the channel test. So when i watch 5.1 material on my pc i cant hear voice etc from centre speaker..only the left and right channel sound.

However when i test the amp and speakers on my xbox etc it works 5.1 fine ...

any ideas?

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phate666 
2/8/08 12:34:36 PM
Master

Are you using Vista?
If so, 32-bit or 64-bit?

If you are only using a stereo source (MP3, AVI) you will need to enable some sort of DSP (Digital Sound Processing) such as Dolby Pro Logic, to produce signal to your Centre, Rears, Sub.

If your source is Multi Channel Encoded (DTS, Dolby Digital) your will want your Onboard Sound Processor to pass it through to the encoder in your Marantz to do the decoding.

I`m not familiar with that MB or onboard chip, so your mileage may vary.

Any more details?

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Beauty is in the eye of the beer holder.

gsg 
2/8/08 9:13:40 PM
Serf
xp 32 bit :) ...

do i enable the DSP on the amp or the PC? ...

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ozacube 
3/8/08 2:43:23 AM
Guru

Surround sound can only be sent over an SPDIF connection (yes, both optical and coaxial follow the SPDIF standard), in a compressed form because there is only so much bandwadth available over and SPDIF connection... said simply, only Dolby Digital or DTS will have surround sound over a digital output.

All systems sounds are sent as uncompressed steroe PCM data, much like most WAV files and CD audio. So when you are testing it with your motherboard, then it's trying to play a sound file, which is limited to stereo output.

This can be remedied by getting a sound card which can encode a DD or DTS stream from your sound to then send over the SPDIF connection. Nvidia used to have this on some of there motherboards with Soundstorm (or whatever they called it), but nowadays you'll need a sound card to do it, from either Auzentech or Asus' new Xonar card... there may be other as well, but these are the main ones ATM and nothing else comes to mind.

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*ISAIAH 53*

phate666 
3/8/08 6:48:54 AM
Master

Navigate your Audio Control Panel and tick the "Speaker Fill" check box.

It may be called something different/similar.

Run your speaker check and let us know.

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Beauty is in the eye of the beer holder.

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