BiAmp Focal Kanta 2 speakers with 1 set of posts.

The Kanta No 2s are not a perfect match with those Primaluna amps.    The impedance dips a hair below 3 ohms and is a hard to drive speaker below about 120 hz.  Bass will be a bit flabby.  This really is a speaker that is best with warm, SS amplification.  If you really want tubes, something like an LTA ZOTL 40 Reference+ bridged mono or something from Octave will handle low impedances better.  

Full disclosure, I am a Focal dealer.  I have no affiliation with Octave or PrimaLuna and do have a friendly relationship with LTA.  

I already have 1 primaluna 400 amp and  preamp. 

I doubt you'll have a problem using the Primaluna in a bi-amp configuration. I would horizontal bi-amp rather than vertical. I'd buy a more powerful amp for the low-end and use the prima on the high-end. Don't forget a good active crossover. Also use some high-end binding posts if you're going to modify the Kantas.

Don't you just love the dealers who manage to insert a "your amp isn't optimum for the speakers I carry?" 

Tacky Verdant Audio. 

"Perfect match" in audiophoolery.........yeah right

@tablejockey i did not know the OP already had a primaluna 400 as that was not stated in the initial post.  I do not like criticizing peoples choices and would have abstained from this thread had I known.  
 

Those amp aren’t my first choice for those speakers.  Given the OP already has one, trying a second one could deliver better results.  If I was the OP, I would see if my dealer would lend me a second amp to try in this configuration.  If it improves the sound in a meaningful way, outstanding!  If not, then he can explore different options if he is unhappy with the single amps performance.