wshields;253999 Wrote: > Sean, > > I am the person who reported the bug with using the word clock in with > a EMM dcc2. I have been following this thread and did something today > that may have fixed my problems. (or it could be a coincidence) To > summarize my problem was that the clock was getting out of sync when > using the emm as master causing popping noises. This was fixed by > switching the streaming format to wav so flac was decoded at server. > > If you look at the emm dac connection to its own transport(manual is > on web at emm site) when using the dac as master there is a clock in > and out connection to the transport(2 cables for clock, 1 cable for > data). Both must be connected for the dac to work as master. There is a > clock in and a clock out for external source as well. So I just today > connected a cable out of the transporter to the clock in of the dac.( I > already had a word clock in to the transporter) I set the transporter to > output a clock thru the digital outs. I set the file types to stream > flac from the server and haven't noticed any popping so far. I did test > that the clock is being supplied by the dac by switching the clock on > the dac to 48 and the sound did speed up. I don't know if by having a > clock in and out to the dac did anything or something else changed to > get rid of my problem. Do you think this could have had an effect? > > Walt Shields
I just got off the phone from a long chat with EMM Labs... you may want to contact them directly as they were quite willing to help. As it turns out they had actually contacted me about a year ago to discuss word clock issues, but at the time we were busy becoming a part of Logitech and I was not able to devote a lot of time to it. I don't have the details on the top of my head, but I did at that time fix a software issue and they were able to get the word clock working. He said they actually continue use the Transporter in-house in this configuration. I asked, completely separate from your issue, how the OptiLink configuration (page 9 of DCC2 manual) works and what is the purpose of the clock connection from the source to the DAC. He said it was a special feature to allow a particular customer to switch between internal and external clock sources in an editing/mastering environment. This configuration does NOT make sense to use with Transporter, and the clock signal from the source to the DAC should NOT be required when the DAC is being the master clock. Now, back to the issue you are describing: Transporter's feature to send a word clock signal out of it's s/pdif ports is actually only active and useable when Transporter is being a _DAC_. That is the point of it... so that Transporter can be the master clock and some other source (a CD player for example) can feed data to it over s/pdif. I have no idea why your setup started to work when you connected a cable from Transporter's s/pdif output to the DAC's word clock in. Certainly there is no chance that Transporter was outputting a word clock, because it could not have simultaneously been transmitting s/pdif if that were the case. Not only is the word clock output feature unusable except when Transporter is being a DAC, but it is electrically impossible for that to happen because the ports can collectively only be driven by one signal or the other. I think there is still some very fundamental setup issue going on. Either Transporter is not really trying to be slave, or the DAC is not really trying to be master. One thing EMM mentioned that people sometimes get confused about is the meaning of the ext clock LED. The Ext Clock LED should be OFF when the DAC is the master. I really don't have the foggiest idea why your setup appeared to start working when you connected a cable from Transporter's SPDIF to the EMM's word clock in. It makes no sense, on many different levels. I would be concerned that even though it appears to work, the DAC is almost certainly not obtaining its clock directly from its internal oscillator. We are making arrangements to get a DCC2 in my hands to do further testing, but it will take some time. -- seanadams ------------------------------------------------------------------------ seanadams's Profile: http://forums.slimdevices.com/member.php?userid=3 View this thread: http://forums.slimdevices.com/showthread.php?t=39770 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
