Resolve 17 causing hum in speakers

Hi
I have a windows 10 and when I run resolve studio 17 my speakers hum. No hum or unning- VLC Media & Adobe Premier Pro. Hum starts as soon as I run Resolve.

Odd.

What's the hardware setup?

Drivers up to date?

Settings under Preferences>System>Video and Audio I/O>Speaker Setup?

Workstation setup:

New
Windows 10 pro system.
Intel Core 19 10900KF
RTX3070
Audio - Intergrated 7.1 Channel HD Audio
upto date

Video and Audio I/O
Audio Interface MADI
Speaker Configuration - Use System Settings other option Manual

Audio Plugins
Memory and GPU - VST Effects
C:\Program Files\Steinberg\VstPlugins
C:\Program Files\VstPlugins

I should add - headphones no sound problems.

One solution, change speakers.

Earlier was using Yamaha powered monitor speakers HS50M
Switched to Yamaha CD receiver CRX-040 through Portable Interface and all good!

Cheers