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 oddiofyl

Just hot swapped my Tab A  to my DAC, both on... DAC recognized Tablet audio content immediately and started playback.  Also said "usb" disconnected " when unplugged....  no I'll effects.

BUT if your owners manual says do not hot swap its probably good advice.