New expensive power cord for amp and no change in sound?

I bought new an expensive(for me) well known and reviewed power cord for my very good amp and plugged it directly onto the wall socket. After a couple of weeks of daily use I hear no change in the sound quality from a $500 cord. I don’t want to name it for fear of getting my thread deleted. You would know it or at least be aware of the company. Did I throw away several thousand dollars? Before I get the snake oil answer I want to let you know that I bought an upgraded cord for my pre as suggested by the pre’s manufacturer and am pleased with the results.

I guess for full disclosure the amp’s manufacturer said don’t bother. But I had had good luck with the pre so I thought it would be a good idea.

Anybody else have this happen to them?


@audphile1 I had a Pass XP-12 preamp and now running XP-22. Power cords make a difference on these preamps as well. 

I am about to start breaking in a new XP-12 and I will start with the stock cord, can you recommend some cords I should consider if I choose to upgrade?

Should have called the cable company.    Try before you buy!


        There are also a number of other cable manufacturers and purveyors that allow a listening period and return policy, if you are dissatisfied/unimpressed. 
         ie:  Synergistic Research has offered a liberal audition period since the early Eighties.      Matter of fact: they offered to send their entire line of interconnects, for one to audition/experiment with, before they made their choice and purchase decision.

                                               And (again):

          Anyone that feels compelled to harp on not hearing any differences, is obviously too obtuse to understand the term "variables" (as frequently mentioned) and worthy of disregard.  

          My only goal in these threads has ever been to encourage those with a mind to experiment with their systems, based on the latest (20th/21st Century's) findings of ACTUAL Physics/science and ignore the Cargo Cult's incessant runway building (objections, convolutions, deflections and obfuscations).

                                                Happy listening!

@zlone Depends on how your system is balanced (lean, warm, bright?), sound characteristics you’re looking for and budget. Not to high jack this thread, may be start a new discussion? Or pm me.