Just want to online streamer and bought a used Wavelength Cosecant Dac with the Denominator 24(32)/196 module and having two minor issues with running it. For some reason my MacBook Pro having problem recognize it, have to unplugged and plugged the power cord couple time for the DAC to appear on my Mac. Second issue is a low frequency hum, only noticeable when no music is played. I'm using a 3meter Kimber USB cable. Being communicating with Gordon from Wavelength and he suggest I switch to a much shorter cable and also he saying the ferrite beads used on this Kimber cable causing more issue than they designed for filtering interfering. I will try a shorter USB cable but do you guys have any other suggestions. Thanks in advance.