I think I had this clicking problem, or something similar anyways, when using a laptop with TBAAM plugged in to Zhaolu. TBAAM, as far as I know, also outputs only 48khz signal. There are no problems whatsoever when I use Zhaolu with my desktop (with AV710) - the sound is clean regardless of what sample rate I use, so I'm not sure if it is the sample rate that causes the problem. The difference between AV710 and TBAAM seems to be that AV710 keeps sending the signal even if there is no music playing, while TBAAM seems to be activated only during playback; and since Zhaolu switches to mute when it receives no digital signal I figured that the clicking had to do with this switching. Anyways, the problem with TBAAM was completely eliminated by using the gap killer DSP plugin in foobar.
Filip