Excessive RFI/EFI from 2012 Mac Mini

[pianoman88]

Last month I downsized from an 8-core Mac Prof to a Mac Mini Server after I discovered that I rarely used more than 2 cores. I used a Duet (version 1) on the MP without interference issues.

When I attached it to the Mac mini, I heard static every time I moved the cursor across the screen, etc. even when the volume on the mixer was set to zero (Yamaha monitors).

I started out by purchasing a high-quality FW400 to 800 cable. It helped a little.
Then I purchased Monster cables for the Duet. That helped out a lot more

(I should mention that I use a "Breakout Box" for the Duet that uses what looks like a modified monitor cable (one pin removed).

I still get noise when I move the cursor, but the level is greatly reduced.

Has anyone else noticed RFI/EFI

 

[fa8362]

I doubt it's RFI/EMI. Probably a driver problem. Are you certain you're using the correct driver for Mountain Lion?

 

[Luap]

It is almost certainly a grounding issue. Likely due to a lack of grounding altogether on the Mini, whereas the MacPro was probably grounded. Plus the Duet is bus powered which means that isn't grounded either.

As a side note.. I find the Duet doesn't work too great in 10.8. I get the occasional bug and audio glitch..