power cables where do I start?

For me, I always start from pre amp. Others will differ but why not you try it different equipment? Once, I tried power cable and IC on just on right side of my mono amp. It's fun doing that kind of shi*. Lol.

You may find this recent thread helpful........

https://forum.audiogon.com/discussions/let-s-talk-power-cords

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.