The major work that we have been developing is a bias supply that uses a miniscule amount of the audio power from the amplifier to develop the bias voltage. This eliminates the AC power cord, but does not have any effect on the sound quality.
I believe the operative words here are "miniscule amount". So excuse me if I have trouble understanding how a better power cable is going to make a HUGE difference.
The "miniscule amount" has nothing to do with power cord differences or the sound differences between the old and new generation models. Read Roger’s response again. The "miniscule amount" refers to the new design just skimming off a tiny bit of the audio signal to derive the bias voltage that was previously derived from the 120v. Power cords are no longer required. How cool is that!
There are so many power cords that get rave reviews in these forums. I have tried many of these and many are downright horrible. And yes, as a courtesy to the manufacturer or due to claims here about cable burn-in, I will run them for a week or two, somewhere else in the house, then try them again in my system. The burned-in cable still rarely survives. And I don’t need that cable to settle in before it performs any better. This is also silly. The instant I put my cable back in, without any settle time, the magic immediately returns.
If someone says that power cords don’t make a difference, either the power cord they are using is overrated or junk, or the system is low resolution to show the difference. So don’t come to a general conclusion just because the PU cables don’t make a difference. In the SL speakers, power cords CAN make a huge difference.
And swapping one for another because one "has more warmth" or "greater extended trebles" never makes any sense. Picking cables because of tonal incoherencies is a no-win situation once you make a change elsewhere in your system.

