Tubes with Infinity IRS Betas

I have had a set of IRS Betas for just over 10 years now, and still have my original pair of Quantum 5s. In the past I have also had Kappa 8s, Kappa 9s and IRS Delta's.To power them properly & safely, I personally have had good results with the older vintage Threshold amps, S300 MKII, S350e & S500e.I have also had good results with modified Halfer amps as well, some moderately modified stereo DH200 and DH220s, and more recently a pair of extensively modded mono Hafler DH200s with custom driver boards.With the Betas I like to use the modded mono Haflers on the mid-high towers and the Threshold S350e on the bass towers, and that setup has power to spare and is the best sounding combination so far.Last year I picked up a pair of Doge Audio tube mono amps, and they do a a nice job on the mid high towers in class A mode. They do run very hot though, definitely need to make room for them to breathe.For the Haflers, I usually do not push the idle current, so they run warm but are not outrageous power consumers.The only thing I regret is not having a big enough room to do the Betas justice.Even so when people hear them for the first time they are blown away.

Back when I owned Infinity RSIIa, (they had three EMIM, three EMIT, two woofers below) I powered them with a Carver. (1985)
I remember he day I played The aria Figaro from The Barber of Seville,  for the entire neighborhood... ( someone was playing very loud music on Saturday mornings a block away.. And on this Summer Saturday I want whomever that was to hear what I was playing.. Opened the windows, put in earplugs and blasted the entire aria so folks two blocks away could hear it clearly.                 
No problem.               
Another time a next door neighbor was annoying me. So I cued up Some hard rock, cranked it up and let it rip. suddenly.               
A few days later the manager, who lived directly above me, told me she was startled out of sleep first thinking a truck had hit the building.... We both laughed.                                  
That was back when EVERYONE was way more laid back...

I like the RSIIa/bs, impressive sound and looks in a single tower configuration. Do you remember what you paid for them? I have a buddy right now who tracked down a good used pair of RS11s, they are nice but not the same without the emims like you had.A few years later (1987) is when I picked up my IRS Deltas, at the time they were $9500 Cdn, I traded in my Kappa 9s and had to sell off a car I was building to help pay for them. I still regret not hanging onto the Deltas, parted with them in 1990 when I moved to another province for work.

PLEASE  GIVE THE BEST RECOMENDATION AMPLIFIER FOR THIS SPEAKERS IRS BETA THANKS YOU

We've had several customers with Betas. They used our more powerful amps- so despite the lower impedances they don't seem that crazy to drive. 200 watts seems to do the job.