What was the first power cable that you noticed a difference in the sound?

Here is post in thread I link to above on Audiquest Hurricane.

I replaced stock power cord on modded Parasound A21 with Hurricane. (See my profile for description of complete system.) Wow. Like waking up a sleeping bulldog. Remarkable increase in contrast and color across the spectrum.

@carlsbad2  Jerry, intuitively it makes sense that the low power requirements of DAC's & Streamers wouldn't benefit by upgraded power cables, but my experience proved otherwise.  I had my Shunyata dealer send me 3 Shunyata power cables, including the lower priced Alpha v2 NR, the medium-priced Sigma v2 NR and the higher priced Omega QR-s.  All 3 power cables were burned in for a minimum of 250 hours.  Of all of my equipment that includes a Gryphon Antileon EVO amp, Gryphon Pandora pre-amp and dCS Rossini Apex DAC / Streamer, I heard noticeable SQ improvements with the highest-end Omega QR-s power cable connected to my dCS DAC / Streamer, which I wasn't expecting.  Furthermore, you would think that the massive Class A Gryphon Antileon EVO amp would also benefit by the QR-s cable, but I heard no noticeable difference between the highest end Omega QR-s cable vs. the medium-priced Sigma v2 NR power cable.  

This seems to suggest that you need to ignore any assumptions and field test various options to find the best overall system synergies.

You don’t mention what you have for equipment.

I recently did the same and borrowed 5 different power cables in the $300 range. 

on my mid-level high end system I heard differences for each cable.

the winner then was Pangea 14XL with Cardas copper.

recently someone Facebook turned me on to Ataudio power cables from aliexpress  

here a $60 cable bettered the Pangea 14XL .

so dunno what you have for an audio system or what type of music you listen to  

but if you hear no differences than you will at least save $$.

@riccitone 
Like you I have a Furman now containing only FM tuner and tape deck. Believe I will move streamer and DAC from AudioQuest conditioner back over to Furman and see whether I get similar results. Thanks for the tip! 

Didn't pay much attention to power cords until I tried the AQ Storm Series.  That was a game changer for me.