What this means is the fact of the matter is the speakers are making this noise due to changes in frequency and also changes in active power.
There is no absolute solution, having a “always active” audio session enabled unfortunately had a side effect of some applications, contents, ports, running slower of faster because the frequency was locked.
Then it’s a matter of PortMaster being the beast that it is you can only do so much before it gets tiresome and this is exactly what this is.
But xyz system doesn’t do it
Find a solution, and if it works great, make a pull request, explain what the solution was in the end and you’ll feel great knowing you’ve solved an issue for everyone.