Connecting laptop to dac via usb- gear on or off?


I’ve been told to only connect my laptop, a MacBook Pro, which is where all my hi res music is, to my dac, with both the computer and dac off. Connection is via usb. 
Anyone else heard that or do that? I was advised that plugging in the computer while on can cause dac issues- 

thanks! 
128x128zavato

Showing 1 response by zavato

I certainly only make the connection with gear off. I was just curious if anyone had ever explicitly been told to do so (as I was by the dac manufacturer)