Looking for ac outlet with no sonic signature

How would you know if an AC outlet had no sonic signature?

I would assume if it didn't make it to bright or to warm.
I can tell if I put an IC in my system and it colored the tone. The same thing, let your ears tell you if the tonality has changed.

"let your ears tell you if the tonality has changed" And how do we compare the before and after? Sorry, but I have to ask - 'cause I'd bet that it's pretty hard to directly A/B that setup.

Human auditory memory last maybe 10 seconds, and on top of that as a species we're kinda notorious for accomodation and similar phenomena of perception. If we somehow cannot arrange some way to do a fairly direct comparison then it's awfully darned hard to claim similarity or difference 'cause our mechanisms of perception just cannot support those claims.

Of the many we offer, we have found the Wattgate 381 Gold the be the most neutral

Zmanastronomy, The only way to tell your AC outlet has no sonic signature would be to hard wire all of your power cords directly to the wiring in the wall. Then you will know whether or not your outlets have a sonic signature.