Power cord supplied with Luxman L-509X Integrated Amp

@fuzztone
Yep, the one and only. He is quite special in the sense that he can use the same number to indicate his year of birth and IQ. 

I found the power cord choice for my 509 to be very influential, and critical, to get the most out of it

Which one did you choose?

I looked into this when I bought my 509x.  Spent plenty of time researching, including long calls with Luxman USA.  Bottom line is they talked me out of a different cord. Said people have gone backwards at times, and I suspect the grounding reference above might have been why

I suppose I should just leave well enough alone for the time being

+1 badger_erich! Power cords, fuses, power conditioners are simply there to extract wealth from one party to another party! 

Good grief what a bunch of ridiculous replies.
Thunderball, there are thousands of products that are engineered in such a way that they do not require a grounded plug, the term for any item like that is 'Double Insulated', so stop worrying about it, Luxman isn’t trying to electrocute you.
My experience with my L-590AX amp is that the supplied power cord is quite good. At one point, I replaced it with a $200 cord from DH Labs, and I couldn’t hear the difference. Later, I bought a more expensive power cord, near the top of their product line, the improvement was quite noticable.