What type of cables make the most difference

@zavato 

I’m quite content with what I have and am not looking to make any sonic differences to my system but rather I’m curious what others have perceived. 

Others may have perceived numerous changes with cables in their systems that don’t occur unless a certain set of qualifiers are unmet. 

For speaker cables, power cables, and interconnects, you should understand that they can all behave as antennas if you let them to. 

Keep them nicely segregated and away from each other. That’s the first step.

Such cables were never invented to improve the sound you hear and experience through your electronics and speakers. 

Only to act as a bridge from point A to point B. 

A cheap receiver does not improve its sonic performance with high end cables.

And truly resolving systems only show differences with cables that are "doing damage" not improving the fidelity of your system.

The electronics and speakers, are always doing the most heavy lifting vs. the cables.
Can you tell me more about your system? Just a few details and I’ll let you know which cables are best for the connections you are making between components etc. You needn’t spend too much money. Or perhaps you don’t even need to upgrade.

@frank009  Take a look at my system profile; in a nutshell, I have Revel speakers, Pass Labs amp and preamp, Pass phono stage, Simaudio phono stage, Linn turntable, Thorens turntable, McIntosh tuner, McIntosh subwoofer, Auralic streaming transport, Simaudio CD transport and a Bricasti DAC. Also have a Headamp headphone amp, plus Sennheiser & Hifiman headphones. Some of my gear isn’t exactly stock. My tuner was updated and overhauled by its original designer. My streaming transport has its chassis slightly modded to further dampen vibrations. Both sets of headphones also have been lightly modded. I think my system is resolving enough. I am definitely not looking to upgrade a thing. 

@zavato 

As Marissa Tomei said in My Cousin Vinny when she was asked about the correct ignition timing , “it’s a 🐂 💩 question. It’s impossible to answer. Nobody could answer this question”.

some, but not all, reasons why in this particular case with your particular question…

1. different degrees of change can be achieved so without considering, level/category, brand and model of cables it’s a no go. 
2. different components react differently to cable changes - some react more to power improvements, some to signal improvements.
3. To the point @hilde45 is making above, quality of your AC power will impact the results of a power cord swap

4. your room acoustics and system and your ability to hear
 

So…without the specifics, as her character said, it’s a trick question. 
 

If you have constructed your inquiry with details specific to your system and cables you are curious about, you would get better responses. As it currently stands, this thread won’t give you or anyone else any reliable data points because the underlying information is missing. 

@douglas_schroeder you are quite correct- my question is motivated by a sincere desire to discover- and to be even more specific, to gain insights to perceptions. 

@zavato 

You are right. Your system is highly resolving with excellent speakers and electronics.

I have always used "World's Best Cables" they are made in Japan with tight manufacturing standards. They are inexpensive and do the job without acting like antennas and don't impart a signature on the system - they allow it to speak for itself and be as transparent and clear as it can be.