I agree that subscribing to the M DSP way would suggest that power cables would not have an effect.

I would normally tend to see power cables as more towards the snake-oil catageory than hard&fast/tangible/demonstrable tweaks.

HOWEVER

I am currently using some cables on-loan from Missing Link into my 8k's.

I have been testing the stock cable vs Orbit vs silver cryo ref.

It is beyond question that power cables DO have an impact on DSP speaker performance.

This difference is repeatable and consistent and is also to a degree verifiaable blind (MrsL had no idea what I was changing but reported the same preference and feedback each time)

The biggest issue for me though is how to determine what is actually better rather than just different.

Anyhow, with your new 5200's, I'd strongly suggest that you spend a good few months running the stock cables that M sent with them before you open up the can of worms....

Rgds,
Nick