Power cord supplied with Luxman L-509X Integrated Amp

I've never had an expensive piece of hifi that DIDN'T come with a cheap looking generic power cord.  Same goes for interconnects.  BYOC (Bring Your Own Cable) is expected.

Oh boy… Audio Science Review militia has embarked 

What is physically happening in the cable that produces a better sound out of the system?

And can it all be measured?

Assuming this was an original US piece, then 2 prongs is all you need, and you'll run into less ground loop / noise problems.

To use 2 prongs the equipment must be double shielded, so that an internal fault won't route the AC's 120V to the chasis.

I still use a shielded power cord however.  This covers the AC wires in a shield that is grounded at the outlet and has no connection at the Luxman for noise reduction.

Most 3 prong cords are not shielded and cheap shielded cords are available on Amazon.

I will start by saying that I rarely use the stock pc’s on any of my gear.
I have a c900u/m900u combo, and several nice pc’s to try from nordost, audioquest, and others.  I found the supplied pc’s were best, just like with Shindo gear.  Tough to say what was different exactly, they just sounded off.  I even asked the importer about this and they also said the included cords are excellent.  He said some liked a aq hurricane on them, which I had tried also. 
Bear in mind that these things are voiced with that cord.  Often a change is perceived as an improvement, when it may not be long term.