I've had Pathos Inpol 2 first driving SF Cremona Auditor M and than SF Guarneri Homage.
Also, during that time had an opportunity to try Parhos Classic amp as well, as one of my friends brought it to hear it with my set up.
I have never listened the pair of speakers you have, but I would think that Classic is not the match for them, not even 2 in the bridged mode.
I would try to explain further my thoughts.
When compared to Inpol 2, Classic (75w ab vs 45w a class) shares all the characteristics of the Pathos sound, but on a smaller level, sort of younger brother. There is that ever present 'warmth' and full display of colors (do not mean that in a bad way, it is just opposite of the 'gray' sensation that some ss designs are giving) but the stage is not so deep or wide and the vocals are not so 'full'.
I guess that is expected since in Europe there is a price difference of around 4t eur between those 2 models
On the other hand, when I first got the Inpol 2, it replaced the Krell Kav 400, which had plenty of power, but not so much finesse.
I really enjoyed it on smaller Sf speakers, but when I hooked it to a Guarneri I started to doubt.
It certainly played music, don get me wrong, but I had feeling that I am not using the full potential of speakers.
That notion was very true and I realised that in a moment when I paired the Guarneri's with my next amp, Krell Evo 302.
Pathos Inpol 2, as fine as it may be, its just not a match for a serious power amp (that includes the Burmester 956 mk2 that I got as well with GH)
To cut long story short, since you have quite 'big' three way speaker, I would advise you to try some amp/preamp combination as I think that Pathos integrates are very nice sounding but not on the same level as your speakers.
I would also say that Inpol 2 is perhaps bass shy, which I did not mind since I had 2 way 'monitor' speakers, but on a more bigger design, as your speaker are, that could be an issue
However, if you decide to get one and if you are worried about maintance or service, I can assure you that Pathos (in my experience) is a great company with great customer care.