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anonymous 29 August 2004

Is there any quality loss by transferring digital information via an RCA SPDIF connection?

The reason I ask is because I want to take in 10 inputs at once on my digi 002 at 96k.

I was planning on going from a Rosetta's RCA SPDIF output into my 002.

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anonymous Sun, 08/29/2004 - 13:53

Thanks for the quick replies. I am extremely happy to hear that. :D

I had read somwhere on these boards that if you used SPDIF it would smear the high end.

Kurt Foster wrote: Actually, the quality will be better most likely due to bypassing the cheezy 002 pres and converters .... especially if you are using a high quality mic and mic pre in front of the Rosetta ....

Yeah I plan on getting a sebatron vmp-2000e. I can't wait to hear how it sounds going through my rosetta!!!

Ammitsboel Sun, 08/29/2004 - 15:11

I had read somwhere on these boards that if you used SPDIF it would smear the high end.

That's another story but you will only have degradation(Jitter) of you have a bad clock... +Jitter also happens in AES/EBU and most of all in Light pipe.

Basically there is no difference in bit to bit transfering when using SPDIF, AES/EBU or light pipe but to understand more about this you can visit http://www.digido.com

Best Regards,

KurtFoster Sun, 08/29/2004 - 15:12

Johnjm22 wrote: I had read somwhere on these boards that if you used SPDIF it would smear the high end.

I can't see why .... s/pdif (sony/phillips diigital interface) is simply a digital transfer protocol ... As David pointed out, as long as you use a true 75 ohm cable and keep the run to a reasonable length (less than 10 feet / 12 meters) , there should not be a problem. ADAT lightpipe runs longer than 12 meters can introduce jitter as well ....

Opus2000 Sun, 08/29/2004 - 22:49

Optical at any distance is worse than anything. By nature it's got jitter due to the reflections within the cable. If you used the Glass Fiber ADAT cables that would be reduced greatly.

SPDIF and AES will "sound" the same in the long run.

The only way SPDIF would kill the high end is if the box that is outputting it was not designed properly!

Being the Apogee tech that I am I can tell you the Rosetta AD is built very well of course :)

Opus

anonymous Mon, 08/30/2004 - 11:31

Opus2000 wrote: Optical at any distance is worse than anything. By nature it's got jitter due to the reflections within the cable. If you used the Glass Fiber ADAT cables that would be reduced greatly.

SPDIF and AES will "sound" the same in the long run.

The only way SPDIF would kill the high end is if the box that is outputting it was not designed properly!

Being the Apogee tech that I am I can tell you the Rosetta AD is built very well of course

Opus

Okay I'm a little bit confused. Are you now saying that transferring digital information will cause jitter no matter what?

Opus2000 wrote: Optical at any distance is worse than anything.

Is an RCA cable considered optical?

maintiger Mon, 08/30/2004 - 14:42

there is definitely an improvement in the sound
when I use my pres via the rosetta into the motu 828 mkii than when I go into the 828 from my pres using motus AD. Also if your program allows use the rosettas word clock or even the spdif instead of your normal clock. you will notice that everything will be tighter, especially the drums.

KurtFoster Mon, 08/30/2004 - 14:50

Xavier,
Try clocking the MOTU off the Rosetta if you can . I suspect the MOTUs conversion will approach that of the Apogee when re clocked by the Apogee.

Many of the high end convereters that employ ADAT lightpipes, use the same chips from ALESIS ... the difference is in the analog circuts and the digital clocks.

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