Andy8421;513012 Wrote: > I think we may be at cross purposes here. Are you driving a DAC with > the transporter? or listening to the transporters analogue outputs? > While I still can't see how wired vs wireless would make any difference > (all other things being kept the same), I can see how using the word > sync input on the transporter and the local clock from a DAC would tidy > things up. > > With your EE background, you should search this forum. There are links > to a very interesting paper about how SPDIF can introduce code > correlated jitter in a bandwidth limited link. So even if the > transporter had a zero jitter clock, by the time it has gone through > your DAC's input circuitry and the clock recovered from the SPDIF > datastream, it will exhibit jitter. > > So dont assume that the transporter has a dodgy clock because your DAC > recovers a jittery clock from the SPDIF stream. > > Still doesnt explain your wired vs wireless difference though. > > Andy.
Hi Andy, Thanks for the info. I'm not using any DAC, not the DAC inside TP or external DAC. I'm using a TacT digital amp, it does PCM to PWM conversion. It is by far the best "DAC" I've heard as there is no analog audio signal involved during the conversion, it is all done mathmatically. The TacT amp does require AC line isolation and loads of ferrite clamps on the speakers cables in order to kill the EMI noise. Once you do this, the sound is pure and precise. It is not cold or edgy. I got warmth and relaxing music. My preamp is the TacT 2.2xp. It is a digital preamp. Its input is sensitive to jitter due to the ASRC used. My TP is connected to the BB and then to the 2.2xp. All connections are done via Toslink to eliminate electical noise. I found this better than coax or AES/EBU. I've also replaced the SMPS inside 2.2xp and BB to a Linear PS. I have tried using TP's word clock in via coax with clock supplied by the 2.2xp's subwoofer digital out. I'm not using a 2+2 system, so the sub out has no audio data or jitter induced by data modulation. The sound is a bit harsh and edgy. My conclusion is that there must be noise entering the TP via an electical connection (coax). Now I've the TP using the clock from Toslink input and that also comes from the 2.2xp's sub out via Toslink. That sounds a lot better than using coax word clock in. In fact, a bit better than TP using its internal clock. I still cannot quite explain why this is the case, as TP using its internal clock should offer more jitter free output than an ext. clock, but it doesn't seem to be the case here... -- Kuro ------------------------------------------------------------------------ Kuro's Profile: http://forums.slimdevices.com/member.php?userid=16701 View this thread: http://forums.slimdevices.com/showthread.php?t=74721 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
