power cables where do I start?

rotaryphone & jond make good suggestions, I can't disagree with what they say.

With that said I'm going to pass some specific suggestions on to you for your set up, however you are the one that needs to decide which power cord (s) to buy.

I personally like this order of preference best, I'm not saying it's correct, just what I found to work for me with several different systems over the years.

Dac (or CDP if you have one), Preamp, Transport, Amp, subs.

If you want a lot of bang for the buck I suggest the following power cords:

Cerious Technologies Graphene power cords purchased used directly from Bob at http://www.cerioustechnologies.com/index.html

Either buy already made or DIY: Furutech SO 22 N (14 gauge wire) Power Cord.

Purchased on eBay from Japan: Oyaid Black Mamba Sigma V2 or Oyaid Tunami GPX V2 power cord.

All power cords I listed will work very well within your system and can be purchased at a very reasonable cost. Personally, I lean toward the Cerious Technologies Graphene power cords. Feel free to PM me with any questions.

Best wishes on your journey, it will be fun regardless of what you purchase.

Aftermarket power cords are a clever ploy to get the gullible to spend their shekels! I am speaking from longtime experience (40+ years!). It would be nice to live in a world where changing a piece of wire brought an improvement in sound quality! Alas ...

The gall of the cable swindlers has no limit!

I believe everyone is entitled to their own opinion but roberjerman didn't answer your question, instead, he opened a can of worms.

If one can’t hear the difference between several upgraded power cords and/or a stock power cord then I believe one of several factors come into play here.
Equipment isn’t up to the task to produce the differences in music.
Your ears are not trained to pick up the finer detail.
You have a hearing deficit and don’t realize it.
I would always recommend that if a stock power cord can be easily replaced, eventually do it when you have the cash. Many stores will allow an additional trial period so you can decied for yourself.

@mswobo if you have not read these two forums you might find it interesting: https://forum.audiogon.com/discussions/cerious-technologies-new-graphene-cables

https://forum.audiogon.com/discussions/new-cerious-technologies-upgrade-graphene-matrix-cables