Amps for Avalon Osiris CAT JL3, Boulder 2060, Dart

I sold my Radians in order to buy a pair of Ascents Mk2 about one year ago. After that I sold my ss amps (monos) and bought a pair of Fourier OTLs (Pantheres). Quite a few members of the audio community were quite negative because Fourier has a bad reputation. My amps proved to be reliable however because the caps mounted are of Japanese origin instead of those that are from India. Pre amp is still solid state (cello). The sound is very detailed with spectacular dynamics. If a small Ongaku amp can drive these speakers a 200watt OTL has no problems at all I assume. Even digital classical records prove to be listenable now. I hear plenty of bottom end (is there any sub that will mate with an otl?). I think the Osirus could also be a good match for such an otl. I read that even newer Avalons with a more difficult load work well with Atma- Sphere. Does the Osirus also have minimum load of 5.5 ohm? Can anybody describe the difference between a Cat and an otl? Has anybody similar experiences?

Essentialaudio, thank you for your insigts about the difference in sound between the Cat and an otl like Fourier. I have considered Sound Labs but they proved to be too big for my 4x8 meter European room. Until now I am not worried about the Fouriers, they are over 10 years old now and have always driven unkind loads including Avalon Eidolon's. The Atma-Sphere's I know well are extremely detailed amps but lacked power in the lower regions although this might have ben caused by the speaker used (Voce divine's if I remember them well). The main complaint I have aout the Fouriers is the noise level of the fans. The biggest mistake I have ever made has been the purchase of a pair of Mark Levinson 20.5. These together with ML 25+26 lacked dynamics. The big Cello's I had were in a totally different league but the otl's had a more life like midrange representation. You can't have it all. If my Fouriers fail I will try Atma-Sphere.

Thank you Rushton for the advice, the previous owner of the Fouriers also had Eidolons. The sound had a very fine bloom and great transparency. Ascents do have a flat impedance with 5.5 ohm minimum, hence I concluded they would be a good match. As long as the Fouriers work well I stick to them. I hope they will because MA-2's are very expensive (here). Great review of the Walker turntable!
I also hear to classical lp's only, I spin them on a Platine Verdier + Naim Aro+ Vd Hull Grasshopper IV on a sand filled box. Even some DGG's (Kleibers Beethoven Sy #5) sound breathtaking.