Preamp - Ayre vs. Audio Research


If anyone has heard both the Audio Research Reference 6 and the Ayre KX-R Twenty preamp, please describe the differences in their sound.

I recently settled on a D'Agostino Momentum S-250 amplifier. I compared it to a pair of Ayre MX-R Twenties, and my report can be found on a thread called D'Agostino vs Ayre. 

Unfortunately, the Momentum preamp does not offer a line out option, and I want that for headphone amp operation. So, I am considering the AR or Ayre preamp options. Thoughts?
imgoodwithtools
Since I don't use a preamp or headphones I am especially unqualified to offer any advice other than that you seem to have to confront nothing but "quality" dilemmas from which we all can learn. 
I look forward to your journey and eventual selection. 
As alway, good listening to you sir,

khrys
i compared a Ref5se to the Ayre which at that time was pre twenty config.
the Ayre was drop dead quiet, accurate and had fantastic low bass.
the ARC bettered it IMO in air, image depth and midrange sweetness.
it was very close.
Ayre got my business with the power amp.
my dealer has both so i would push him to borrow both .... but i would also give tge Brinkman which he carries a shot and maybe the Aesthetix
a great dealer with real depth is a wonderful thing !!!!