Originally Posted by Kaptiva
Originally Posted by franmon83
It seems indeed to be the same issue. I will try this week-end to see if the issue is still present. If it is, I will proceed with some more testing to try and diagnose what is the source of this problem. It could be the USB port, the OS, the cable, the Compass itself (which I hope it's not). We'll see...
I'd tried using Window 7 system with foobar player on the same laptop ie MacAir. It didn't have such problem. So I'm guessing it is firmware/OS related. May I know what Mac OS version you using? Mine is 10.75. According to KingWa, some user have no problem while using the latest MAC OS X Mountain Lion.
Since yesterday, I'm testing the USB input of the Compass, but from the back USB port of the Macbook Pro (The one right beside the Thunderbolt port on the MBP early 2011). I read on different websites that for some reason (which were detailed but I did not pay too much attention to it), the back USB port of MBPs can provide a lot more bandwidth than the front one, which makes it more suitable for audio purposes. 98% of the dropping are now gone. I at most get 1 drop every 20-30 minutes now, compared to every minute before. Also, I realized that the sampling rate settings that I chose in my player changed that behaviour a little bit. For instance, I'm using Audirvana Free right now, which exposes different upsampling options. I realized that the less demanding the options, the less drops I had. FYI, I have the latest Mountain Lion (10.8.2). I still find it weird though because I previously used an Apogee ONE USB audio interface and I never noticed any dropping at all, and I had it connected on my USB hub. When I tried to connect the Compass to the USB hub, it would not even get detected by the Mac... It is probably a mix of the OS and the Compass input being picky.
But, in my case I cannot tell any difference between the optical and USB inputs in terms of quality and I do not experience any drops with the optical input, so I will probably just stick with that one once my testing is done.
I am curious though, do you detect differences in quality between the different digital inputs? I only tested optical and USB, since I do not have a SPDIF source, but they seemed pretty much of similar quality to me.