soundcheck;602356 Wrote: > Hi folks. > John Swensson AFAIK tried to and did slave his Touch to a DAC master > clock. > Slaving the transport will be a better approach of course. Though I'm > sure he'll face other challenges to keep PC induced distortions out of > his setup. > > Enjoy.
I HAVE figured out how to do it, what is going on with the Touch makes no difference to sound. You are right that it entails running the DAC clock into the Touch and taking the I2S data from the Touch. I use an LVDS interface on a shielded differential flat cable. The Touch sits in its own metal enclosure and the most important part, it has a completely separate power supply. The only connection between the DAC and the Touch is the LVDS interface. As long as there is ONLY one ground connection it doesn't actually have to be galvanically isolated. Of course it takes multiple power supplies on the DAC part as well as careful ground control so each part of the system only has ONE ground connection to the others. If done properly this guarantees that no noise from the digital section can get into the analog section, either directly or as jitter. Its not simple or dirt cheap, but its well defined engineering not voodoo science. Because of the multiple power supplies and separate shielded sub-enclosures you can't so this in a tiny box, it takes a good sized box. That also means its not dirt cheap either. It doesn't have to be horrendously expensive either, it should be possible to do a VERY good implementation for $2-3K. There is nothing in this approach which REQUIRES extremely expensive components (for example in the one I've built the most expensive part is $30 , the DAC chips themselves). There ARE a lot of parts but none are particularly expensive. Done right all these software tweaks really are unnecessary to achieve the best sound. That still doesn't make TinySBS work super fast, but its not degrading the sound as long as you can get it to work at all. John S. -- JohnSwenson ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=84742 _______________________________________________ Touch mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/touch
