Do power supply units/cables make a difference in sound quality?

@baumwoll  Threshold amps are some of the greatest amps ever built. I personally use a Threshold Stasis 350e in one of my systems and I recently replaced the four rail fuses.

I could not believe how great it sounds now, it was great before but now incredible and I haven't changed the main fuse yet!

I used HIFI Tuning gold plated silver fuses, only about $40-$50 each, but an incredible upgrade.

There's a lot of negativity about cables here so just try the fuses, it's a very small investment.

Power amps always directly plugged into the wall.

Thanks steve for your input...were all the benefactors of your experience 👍

Steve, Thank you for taking the time to post such an informative description on the subject of cables.  I buy into the contribution of high quality connecting cables between components up to a point of cost/benefit.  The value of a power supply unit costing 4 figures is questionable for me, given the stability and lack of interfering noise on my rural electric supply.  I am really curious about Lordmelton's suggestion to try HiFi Tuning gold plated silver fuses, I assume on my Threshold amp.  I wil explore that.  Thanks all.

Lots of smart folks offering opinions. I'm in the same throes debating whether to add something other than the Furman ELITE15 PF i Linear Filtering AC Power Conditioner that I own. Before I dive into a more expensive component, I'm having a dedicated line installed from my main panel to my stereo system. I also purchased a "Silver Cryo Receptacle" so the cost will be a few hundred dollars. I've talked with a few audiophiles that confirm, it is an inexpensive step to do before shelling out thousands for a power plant, conditioner, etc. that may/may not help. 

“I am quite happy with the sound from all sources”

^Your answer^

I wouldn’t buy the cables.