Looking for ac outlet with no sonic signature

I've tried all of the Oyaide outlets, Maestro and Porter Port. I've settled on the Avatar Acoustics Afterburner 8 for my outlets. I don't detect any sonic signature.

http://avataracoustics.com/avatar_acoustics.html

Chuck

I love the Porter Port i bought here on AGon from Albert Porter.
It allowed more air and soundstage without any tonal issues.

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.