Createive x-fi expresscard multichannel - bit-tech.net Forums

Splynncryth · 19th Mar 2009, 23:06

I have a SB0710 express card sound card for my laptop. I have finally gotten around to getting some proper multichannel speakers that I am connecting via an optical jack. I cannot get anything from any speakers other than the front left and front right speakers. I can't find a magic button that says "enable multi channel support". I have tried every speaker setup above 2.1 (which are 4.1, 5.1 and 7.1).
The speakers are connected via the optical output and I do not have their analog multichannel dongle (didn't figre I needed it with TOSLINK).

Am I yet another consumer stiffed by creative, or is there something I have overlooked?

azrael- · 20th Mar 2009, 07:59

S/PDIF, whether via optical or coaxial cable, can only stream a stereo PCM signal. The only way to get multi-channel audio over S/PDIF would be to stream previously encoded (DD/DTS) multi-channel audio and that, in turn, requires a decoder on the other end of the stream.

In short, if you want to get multi-channel audio from your sound card you need to connect your speakers to your sound card with an analog connection.

Oh, and you're not getting stiffed by Creative on this; it's just how S/PDIF works.

Splynncryth · 20th Mar 2009, 22:10

It handles the optical surround data from my 360, DVD player, and digital TV tuner just fine. I intend to double check if my old nForce board's Soundstorm would play the test audio through all the speakers using an optical connection as well.

I did some more digging after my frustration had died down, and it may have something to do with AC3 encoding, but I have not seen any options for that.

azrael- · 21st Mar 2009, 01:25

Well, if you get multi-channel audio from your 360 it's because it is already encoded in DD (AC3) or DTS. S/PDIF as such cannot transport anything other than PCM stereo. You'd have to find some sort of e.g. AC3 encoder to encode your multi-channel audio before sending it to your sound card. You might want to give this a try, although I don't know if it works.

Splynncryth · 21st Mar 2009, 03:10

I'll give it a try.
What bugs me is that this is not mentioned in the Creative material, and I expected at least the sound test to to drive all the speakers.

As a point of comparison, I tried my old nForce based system connected via TOSLINK and it didn't have a problem driving each speaker for the sound test, and the environmental effects the driver support will utilize all the speakers in a 5.1 setup.
So if an old socket A based board did it, I assumed that it would be common practice on modern hardware. Apparently, I am mistaken.

Creative has had a number of problems the past few years to upset their consumers, so I am concerned that they may not all be resolves. I have been using their products since my first computer many years ago when cards were still marketed as sound blaster compatible, and you needed to know arcane letter/number strings like A220 I5 D7.

azrael- · 21st Mar 2009, 12:40

The reason your old nForce-based motherboard can do it is because it could encode multi-channel audio into an AC3 stream in hardware before sending said stream over S/PDIF. I remember people being pretty miffed when nVidia dropped the AC3 hardware encoding. It started with the A64 chipsets, if I remember correctly.

I need to once more stress that *this* particular issue has got nothing to do with Creative (although they can be blamed for much else

). It's just how S/PDIF (Sony/Philips Digital Interface) works.

Splynncryth · 21st Mar 2009, 16:59

OK, so I was just spoiled by me previous system

I will have to keep this in mind when I start shopping for parts for a new syste or a new laptop.

19th Mar 2009, 23:06	#1
Splynncryth 0x665E3FF6,0x46CC,... Join Date: Dec 2002 Location: USA Posts: 1,416	Createive x-fi expresscard multichannel I have a SB0710 express card sound card for my laptop. I have finally gotten around to getting some proper multichannel speakers that I am connecting via an optical jack. I cannot get anything from any speakers other than the front left and front right speakers. I can't find a magic button that says "enable multi channel support". I have tried every speaker setup above 2.1 (which are 4.1, 5.1 and 7.1). The speakers are connected via the optical output and I do not have their analog multichannel dongle (didn't figre I needed it with TOSLINK). Am I yet another consumer stiffed by creative, or is there something I have overlooked?

20th Mar 2009, 07:59	#2
azrael- Arrogant twit. No, really... Join Date: May 2008 Location: Aarhus, Denmark Posts: 1,433	S/PDIF, whether via optical or coaxial cable, can only stream a stereo PCM signal. The only way to get multi-channel audio over S/PDIF would be to stream previously encoded (DD/DTS) multi-channel audio and that, in turn, requires a decoder on the other end of the stream. In short, if you want to get multi-channel audio from your sound card you need to connect your speakers to your sound card with an analog connection. Oh, and you're not getting stiffed by Creative on this; it's just how S/PDIF works.

20th Mar 2009, 22:10	#3
Splynncryth 0x665E3FF6,0x46CC,... Join Date: Dec 2002 Location: USA Posts: 1,416	It handles the optical surround data from my 360, DVD player, and digital TV tuner just fine. I intend to double check if my old nForce board's Soundstorm would play the test audio through all the speakers using an optical connection as well. I did some more digging after my frustration had died down, and it may have something to do with AC3 encoding, but I have not seen any options for that.

21st Mar 2009, 01:25	#4
azrael- Arrogant twit. No, really... Join Date: May 2008 Location: Aarhus, Denmark Posts: 1,433	Well, if you get multi-channel audio from your 360 it's because it is already encoded in DD (AC3) or DTS. S/PDIF as such cannot transport anything other than PCM stereo. You'd have to find some sort of e.g. AC3 encoder to encode your multi-channel audio before sending it to your sound card. You might want to give this a try, although I don't know if it works.

21st Mar 2009, 03:10	#5
Splynncryth 0x665E3FF6,0x46CC,... Join Date: Dec 2002 Location: USA Posts: 1,416	I'll give it a try. What bugs me is that this is not mentioned in the Creative material, and I expected at least the sound test to to drive all the speakers. As a point of comparison, I tried my old nForce based system connected via TOSLINK and it didn't have a problem driving each speaker for the sound test, and the environmental effects the driver support will utilize all the speakers in a 5.1 setup. So if an old socket A based board did it, I assumed that it would be common practice on modern hardware. Apparently, I am mistaken. Creative has had a number of problems the past few years to upset their consumers, so I am concerned that they may not all be resolves. I have been using their products since my first computer many years ago when cards were still marketed as sound blaster compatible, and you needed to know arcane letter/number strings like A220 I5 D7.

21st Mar 2009, 12:40	#6
azrael- Arrogant twit. No, really... Join Date: May 2008 Location: Aarhus, Denmark Posts: 1,433	The reason your old nForce-based motherboard can do it is because it could encode multi-channel audio into an AC3 stream in hardware before sending said stream over S/PDIF. I remember people being pretty miffed when nVidia dropped the AC3 hardware encoding. It started with the A64 chipsets, if I remember correctly. I need to once more stress that this particular issue has got nothing to do with Creative (although they can be blamed for much else ). It's just how S/PDIF (Sony/Philips Digital Interface) works.

21st Mar 2009, 16:59	#7
Splynncryth 0x665E3FF6,0x46CC,... Join Date: Dec 2002 Location: USA Posts: 1,416	OK, so I was just spoiled by me previous system I will have to keep this in mind when I start shopping for parts for a new syste or a new laptop.