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S/PDIF output from PC to DAC?
tahaa7
post Jul 14 2012, 20:24
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Hi,

I'm considering getting the Musical Fidelity M1 DAC, and I have one important question upon which my purchase depends.

Since M1's USB input is actually quite bad for the price, in that it only supports up to 16-bit/48kHz signals, I've been considering connecting the DAC to my PC's onboard S/PDIF optical out. Now: how much does the quality of S/PDIF out depend on the quality of the (onboard) soundcard and the motherboard in general? Will there be additional jitter and/or interference caused by my PC's circuitry?

I have a Realtek ALC888 chip, and the motherboard is MSI K9N2 Platinum.

Thanks for help.
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nagual
post Jul 17 2012, 19:23
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From: http://www.digikey.com/Web%20Export/Suppli...df?redirected=1

Precautions for Using TOSLINK
................................................................
................................................................
................................................................

The case for the TOSLINK (simplex) optical receiving module and (duplex) optical transceiver module is made of conductive
plastic.
The case is designed to provide shielding against noise when the reinforcing pin at the front of the module is grounded. When the
module is used, this pin should be connected to the signal ground.
Since the case for the optical receiving module and optical transceiver module has a resistance of several tens of ohms, ensure that the
case does not touch the power line or any other circuits.
Generally, the use of optical transmission devices is considered to improve noise resistance.
While optical fibers are certainly not affected by noise, optical modules, particularly receiver modules, are comparatively easily affected
by noise because they handle such minute current signals.

To improve noise resistance, the TOSLINK case is treated to make it conductive. However, since the signal output from the optical
receiving modules photodiode is a minute current signal, in some environments simply shielding the case will not protect against noise.
When using a TOSLINK device, conduct live tests to check noise resistance.
A simple noise filter is mandatory for the power lines for the TOSLINK optical receiving module and optical transceiver module.
However, in the case of significant power supply ripples, further filter reinforcement is also necessary
. In addition, when the optical
module is placed in a location susceptible to emission noise, Toshiba recommends covering the optical module and power supply filter
with a metal cover to enhance the shielding.


Of course this not means that thereŽs noise interacting with my optical connection, or that it is audible. On the other hand, IŽll try to make the RMAA tests, whatever they be, and post them here (but only if they confirm my suspicions...)
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Posts in this topic
- tahaa7   S/PDIF output from PC to DAC?   Jul 14 2012, 20:24
- - kiit   no, that works best.   Jul 15 2012, 01:18
- - Light-Fire   QUOTE (tahaa7 @ Jul 14 2012, 15:24) ... i...   Jul 15 2012, 05:25
- - Porcus   FWIW, http://www.musicalfidelity.com/m1dac/ claim...   Jul 15 2012, 10:13
- - skamp   Someone should tell them that confusing kilohertz ...   Jul 15 2012, 10:36
|- - Porcus   QUOTE (skamp @ Jul 15 2012, 11:36) Someon...   Jul 15 2012, 10:57
|- - tahaa7   QUOTE (skamp @ Jul 15 2012, 04:36) Someon...   Jul 15 2012, 13:40
- - JJZolx   Here's cult hero Monty making the same "m...   Jul 15 2012, 21:14
|- - phofman   Well, I would understand an end user being confuse...   Jul 16 2012, 06:52
|- - Porcus   QUOTE (phofman @ Jul 16 2012, 07:52) Well...   Jul 16 2012, 10:55
- - JJZolx   "192 kHz" is not wrong. You are the ones...   Jul 16 2012, 11:10
|- - Mark7   Funny thing is that Musical Fidelity makes the sam...   Jul 16 2012, 11:57
|- - Porcus   QUOTE (JJZolx @ Jul 16 2012, 12:10) ...   Jul 16 2012, 13:28
- - LithosZA   Strange, it seems that they use Khz in the 'DE...   Jul 16 2012, 12:24
- - Arnold B. Krueger   QUOTE (tahaa7 @ Jul 14 2012, 15:24) Hi, ...   Jul 16 2012, 15:37
- - nagual   QUOTE (tahaa7 @ Jul 14 2012, 21:24) Hi, ...   Jul 16 2012, 19:01
|- - pdq   QUOTE (nagual @ Jul 16 2012, 14:01) From ...   Jul 16 2012, 19:43
|- - Arnold B. Krueger   QUOTE (nagual @ Jul 16 2012, 14:01) QUOTE...   Jul 17 2012, 00:00
- - mixminus1   The only way noise from the PC could end up in a T...   Jul 16 2012, 21:06
- - nagual   QUOTE (Arnold B. Krueger @ Jul 17 2012, 01...   Jul 17 2012, 01:56
|- - uart   QUOTE (nagual @ Jul 16 2012, 16:56) QUOTE...   Jul 17 2012, 15:46
|- - Arnold B. Krueger   QUOTE (nagual @ Jul 16 2012, 20:56) QUOTE...   Jul 17 2012, 16:26
- - nagual   From: http://www.digikey.com/Web%20Export/Suppli.....   Jul 17 2012, 19:23
|- - pdq   QUOTE (nagual @ Jul 17 2012, 14:23) On th...   Jul 17 2012, 19:44
|- - uart   QUOTE (nagual @ Jul 17 2012, 10:23) From:...   Jul 17 2012, 19:55
|- - Arnold B. Krueger   QUOTE (nagual @ Jul 17 2012, 14:23) On th...   Jul 17 2012, 21:29
- - mzil   I think (I hope) he means, "I'll post the...   Jul 17 2012, 23:59


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