Fritz Carerra Be + Audio Research Ref 3 = WHAT TUBE POWER AMP

I had the Be speakers for a while and the tweeter is very detailed and bright (in my room). I suggest an amp that can utilize tubes like EL34 or KT77, KT120. DAC is also important. You might consider emailing Aric at Aric Audio about these: https://aricaudio.com/products.php?product=SPRKT88120

I'm using a Cronus DARK with my Be speakers. 2 SVS SB 2000pro in a12x16 treated room, perfect!

VAC gives that tube goodness without sounding veiled and fully balanced like your ARC.  Here’s one…

https://www.usaudiomart.com/details/650058214-vac-phi-200-mono-blocks-upgraded-to-iq-auto-biasing-rare/

Best of luck.

I 2nd @hilde45's thought. Give Aric a call. Check out his website. He is great to deal with. All his products are point to point wired and can be modified to suit.