(There are three new components in my system that are not fully broken in including a blue fuse in my amp; therefore, take what I'm about to say with a grain of salt.)
Just today I installed the Blue receptacle into my power conditioner. The Cardas 4181US was replaced by the Blue UEF as the first receptacle in the series of 3 receptacles. The reason was so that the benefits, if any, can be shared or passed along to the rest of the receptacles.
The conditioner's transformer is connected directly the the Blue UEF being the first receptacle in the series.
The conditioner's current configuration consists of a Blue UEF, GTX-D NCF with a .47uF copper VCAP in parallel , and a Cardas 4181US as the last receptacle in the chain also with a .47uF CuTF in parallel.
The Blue UEF has the computer (source) and Pass XA-25 amp connected to it. The GTX-D NCF has the Lampizator Amber II DAC and computer monitor connected to it. The Cardas 4181US has a hard drive reader connected to it.
My first listen was very positive. The imaging is more solid/vivid; improved 3D image. The sound is very dynamic from top to bottom including more bass than I've had in my system. The bass is solid and not bloated so it does not sound artificial. Soundstage seems larger and has improved layering and separation.
It appears that the Cardas may have been restrictive to the sound system. Remember that it fed power down stream to the other receptacles. The Cardas receptacle is now last in the chain so it cannot contaminate any other receptacles.
I'm not trying to bash the Cardas receptable at all. It is definitely the best constructed receptacle that I've seen. The build quality is top of it's class. It's sound quality will be investigated further.
http://i64.photobucket.com/albums/h162/triggr_357/20181010_180726.jpghttp://i64.photobucket.com/albums/h162/triggr_357/20181010_174211.jpg