Avantgarde Trios, SETs, and Impedance Curves

With my Trio 2.2s, later upgraded to Trio Omegas (huge difference, btw, like removing stuffed cotton from the horns), and using a pair of 225 subs in an 18 sqm room, I have tried Jadis 845, Zanden 300B, Hovland Sapphire, Lamm ML2, and Audion 300B power amps. The Lamms sound by far the most dynamic and detailed with full top to bottom extension, all other amps sounded somewhat anemic/rounded off though perhaps richer/more musical in some aspects. I have yet to find the sound I am looking for, but am sticking with the Lamms while I continue to tweak the rest of my system.

Has anyone tried the ART PX-25 or Wavelength Cardinal with Trios. Anyone else have any comments on 45 SET's with Trios.

I have a friend with the ART PX-25- its not bad on the Trio at all. There are no 45-based SETs that can drive the speaker- try as you like, 0.75 watts is not enough...

Most people I know that are driving the speaker successfully use surprisingly large amplifiers given the efficiency of the speaker. This is probably due to the impedance curve, which is tricky for a lot of zero-feedback amps (which otherwise will be the best sounding on a speaker like this).

I should mention the Zanden 300B sound the best on many types of music from the midrange up - detailed and musical - but just sound anemic down below. If there was a way to biamp the speakers, or otherwise adjust the bass quality, I would stick with the Zanden. I tried biamping with Lamm and Zandens, and it sounded really wacky. I also tried left speaker with Lamms, and right with Zanden (ok, shoot me), and sounds surprisingly OK if I'm sitting in some off-axis position and don't mind the different sonic signatures - the brain somehow compensates after a while.

I have Trio Omegas with double and now I'm using triple 225 subs. At first I used a Berning Siegfried and it was wonderful except for the huge turn on and off thump it had. It's not sensitive to impedance like most OTL's or SE amps. Now I have some Butler Monads and they were as good as the Berning and dead quiet too so I sold the Berning. Now I have a Tube Distinctions 15watt SE amp that is outstanding but haven't had time to compare it to the Monads. It's way more engineered than the TEAD Linear A. I could be happy with either but one of these days I'll have to do a shootout. I'd love to try the First Watt F3 also and may do that since they have a return policy.