Pass X1 preamp question

Apparently it's psychoachoustical and being very suggestive by nature there appears to be a difference but there is none in reality other than what I think I hear. I love the preamp.

Steno, How do you find the Pass preamps compare with the Chapter. I see you use or used one in your system. Personally I think the X1 sounds quite good but I'm curious about the Chapter for curiousities sake.

It's as if some rf is removed making the sound cleaner but it's subtle.Any body else notice this?

I hear a slight edge off the top removed with the dimmer down. I know the digital circuitry is seperate from the analogue and the difference I hear is very subtle yet it is there. Not enough to have me dimming down the display all the time however. The difference is slight. A very touch more snap in the highs.

The difference I may be hearing with the display off may warrant it being dimmed off if doing some extremely careful critical listening.
I still say there is a difference psychoachioustical or not. I notice a slight touch of noise dissappear like just the very edge of a snap of a cymbol. With the disply on the snap has more bite but with the disply off it is a tad more natural. That being said, it wouldn't be the first time my mind played tricks on me, but I know what I hear.
The difference isn't worthy of switching the display on and off.
I leave it on to see the volume and know which function I'm on. I love my X1.