hospital grade or commercial grade receptacles ?

Irvrobinson...My dog says "woof, woof". Make what you want of this.

Hdm...I don't think that it is valid to compare a 115 vac wiring change with the Underwood mod to the Denon player. The mod involves replacement of a lot of active circuitry, and it is entirely to be expected (on a purely scientific basis) that the sound characteristics will change, for the better we hope.

When I tested the cryo'd outlet I put on my objective experimenter's hat. Believe me it would have been much more interesting if the test results had come out the other way. If anything, I was biased towards hearing an effect.

OK, the pre-amp and the CD player it is, rather than the amps.

Is this the same Irvrobinson who said, "Don't waste too much money on powercord-related stuff. Save your money for better speakers, acoustical treatments, amps, and source components (probably in that order). Those are the things that make a difference. Use your head and reason, don't just read advertising and bogus magazine reviews. How could an outlet provide such a superior connection that water boiled 20% faster? That's poppycock. Put on your thinking cap."

Tbg, I have no intention of buying a power cord. My wife wanted to see if she could hear a difference. She knows I think she's wasting her time, but she read some of the high-emotion responses to my posts and wants to hear for herself. Local dealers are willing to lend out cables, and I'll just take them up on offers they make anytime I go shopping. It's no big deal.

Like the quote said, put on your thinking cap. And, like Albert, take a reading lesson, then read the posts. I think differences in power cables and outlets, cryo'd or not, are an illusion, and nothing posted here - NOTHING - has changed my mind a bit. I've experimented and heard nothing, and that's because there's no difference to hear. I'm indulging my wife's curiosity, nothing else.