Power Conditioner vs A/C cables

Power management is very site dependent. Depending on the power grid you are on, what your house is like... lots of noisy things in your house.
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I wouldn’t look at it as if a power cord is going to make things worst... I would look at it as how much improvement will it give you.
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A good plan is to borrow power cords on line or from dealer and experiment. If a power conditioner makes a big difference power cords all around are likely to have a big effect.
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We have all buried power lines in our neighborhood, so the power is pretty good. Power management still makes a difference. All that said, no question listening is best Sunday nights at midnight... showing me, I need to pay more attention to power... Damn... this post is going to cost me.
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This is actually why I read and post in the forums. Writing about what I have learned frequently has me put together some observations I had not previously assembled to form a conclusion. In this case I am sure it is going to cost me at least $10K. But I am also sure it will be worth it.

I've had systems that as I added AFTER a good conditioner and master coupler, the system got noisier. AGAIN a buddy and his BIG ol Power cables weren't shielded properly and just screwed the whole system up..

I swap the PCs out for the right kind of cable, everything else became kind of secondary.. I was 45 years old then, I'm 66 now..

Another thing I've noticed in other's systems they use a PC that are WAY to big for the application..  Bigger is actually worse in some applications..

I've notice where it's being used makes a difference AND the quality of the power supply in the piece of gear.

Crap power supplies benefit more from a BETTER construction (filtering) than (for example) a Mac..

DAC, routers, Laptops (not so much),

Phono Stage, Pre Amp, Streamer/Server, Power Amps BIG TIME..

Reel to Reel is still in ? stage for me, cabling is a mystery vs quality..

I just spent two great day in the Barrios listing to street music.. No I ain't sayin where...BUT it wasn't in the US WOW... I never ate so much good food and seen so many masked beauties.. Fantasyland!!!

I never saw anything BUT heavy copper. Serious tight a$$ jammin' going on.. Electrical tape everywhere, chain hook the cable drop it on the gravel.. Good music.. mercy..

Regards

I decided I need power conditioner with filtering and strong overvoltage protection anyway.  I bought Furman Elite 20PFi and placed it on the shelf below DAC and amp.  I concluded, that if power cables have effect on sound, it will be proportional to the length of the cable.  I built very short (1.5ft) shielded cables using Belden 83803 and Wattgate connectors.  

I believe that good power filters are very useful. Both to filter your AC, and to block digital noise from the digital/switching power supply components (computers, TVs, other). This means a mains filter AND a 2nd one, can be fairly simple, just for the digial /switching stuff.
Power cords i have tested many times and fail to find an value, unless you are replacing something deficient- which is not all that uncommon, but easily avoidable for $20

A power condition that generates its own pure sine wave output is worthwhile to completely remove line noise.

Shielded power cables stop Electromagnetic Interference emanating from the cables. Certainly EMI is present in the environment, but it is still important not to add more in close proximity of equipment.

If you are really serious, both are crucial!