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davedotco said:iMark said:I can't hear any difference between my Macs directly into the DAC or via the Airport Express. Both connections with Toslink. The only difference is the 2 second delay which is always there in AirPlay.
Spotify Ogg-Vorbis files converted to ALAC have no effect on sound quality at all. The conversion shouldn't have any effect at all. ALAC is lossless, so you don't lose any information, even with compressed files like Ogg-Vorbis.
I would recommend that you first do some double blind testing before making statements like 'sharper more focused sound quality'.
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I attempted to be fairly circumspect with these views, giving plenty of ifs and maybes. I even specified my computer setup to try and make it clear that the veiws were from just one setup and quite personel.
Double blind testing, are you serious? Just how do you expect to implement that in a domestic environment or at a dealers? These were subjective evaluations, I did my best to level match and was able to set up the switching so that I did not know whether I was listening to wired or wireless.
Airfoil was clearly a bit 'rough' and 'grainy', Airplay was much less obvious but appeared to lack sharpness and focus, entirely subjective I grant you, though I never suggested otherwise.
As for the conversions, I have no idea how it is done, but as far as I know there is no way to check if the Ogg Vorbis to Alac is totally transparent as you cannot compare the resulting file to the original. Logically you may well be right , I accept that, but I was recounting what I heard. At some point, hopefully quite soon, I shall be able to try Connect and Airplay side by side.
BTW. Did you carry out a 'Double Blind' test to ascertain that your Yamaha R-S500 sounds 'wonderful'.
I was also a long-time Airfoil user until I found out that it has major jitter issues. It is not only that frames are not time-aligned with each other, but that the timing of audio is way too off.
I tried with two different DACs that de-jitter audio coming on the TOSLINK port—my current irDac, and previous Naim DAC-V1. In order to re-clock data, they use a small input buffer from which they take the frames to play according to their own internal clock. So the problem with Airfoil is that timing is so off that it would overrun the buffer. The DAC-V1 would go as far as displaying an error message on the screen saying that it could not reclock the data, and then it would give up; and the irDac would stop playing every few seconds.
I contacted Airfoil about this and they said they would try to resolve it in a later version. I had the impression that they were already quite aware of the issue, and since their response didn't show any commitment, that they didn't really intend to fix it. This was like a year ago and the problem is still there—just opened it to confirm it.
If you use the analogue output of the Airport Express, or connect it digitally to a DAC that does not reclock the audio, you won't have these issues with the music stopping. But the jitter is there all the same, and you can hear it as it affects the detail and the imaging.