I have just acquired a Director DAC for use with a WIN10 PC - when I try and play any files, I get a pronounced amount of background hiss (but the files play). I have an existing Director, which I have had for some while, working on a Win11 (laptop) PC, and this doesn't have the same problem (even when running the laptop from its mains supply). I tried swapping the DACs and the problem stays with the PC, so its not the DAC itself which is the main issue. I also have an Explorer 1 and this works OK on the 'noisy' PC. I don't know what version of firmware any of the DACs is running and can't find out since Meridian has now removed all drivers etc. from its website (unless anyone can ping me a copy of the right files and a quick 'how to' guide?)

I'm guessing that the problem is a ground-loop or a noisy USB supply in the (all-in-one Dell desktop) PC? This wouldn't explain why the Explorer works OK, though... Can I safely run safely the Director with its external power supply? Would this automatically disconnect the USB supply?

Any suggestions or ideas gratefully received.

G68ADV, G98DH, M60C, Director, Explorer