Help power pair of Infinity Kappa 9's please

The room opens up to the rest of the house, we party loud, very loud. If I could sell the Kappa 9's for let's say $2000 what speakers, in that price range, would have "much better sound"? Also the efficiency rating I posted is directly out of the owners manual:
http://www.infinity-classics.de/infinity/technik/manuals/Kappa_9_technical_sheet.pdf
I should have acknowledged that the room is not ideal for the speakers. But letting them go is not really an option for me, because in my opinion there is no better sound for the money. I appreciate your input, I will look into some Krells and Levinsons.

Agree with above post,those speakers are amp-killers.Anything besides a high current amp will melt.2500$ will barely find one worthwhile.Good luck,Bob

Agree w/the above responses, however, a pair of Adcom 565 mono-blocks might work. I had the Kappa 8's paired w/the 565's & chose the 8's over the 9's based on my dealer's rec. (who is still in business!) so many yrs. ago. What, early to mid 80's? He said the same thing-the 9's were amp killers.

Being that the 565's are older models, they would prob. need a recap but you could fit all that in under budget. Since you're after loud, another solution might be to buy some pro audio amps, paying attention to how low they can go before clipping. There's a lot of crap on the market today, so go with a proven brand name that holds up.

A speaker change that might work for you is the VR4, which show up from time to time in your price range. They can play at sustained high SPL's & but they also need plenty of power to sound their best. I have horizontally bi-amped VR4 GenIII's and at the 12' mark could easily play them at 107 dB, which is loud enough to carry through the house. I want to add the caveat I was using Ayre's top two amps at the time & wouldn't attempt those levels with lesser electronics.

Something I just thought of. You could prob. buy a used PA system from somebody going out of the band or DJ biz & get your loud levels at $2500. Just search Craigslist under "DJ" and a whole page should pop up. I just checked & for $1k you can get something that will play loud.

Infinity Kappa 9 is not 102db. Not even close. The Technical Manual has a misprint.

I had Kappa Sevens and as mentioned they are amp killers. The only amp that really seemed to power them and bring them to the best performance in my ownership period was a Mcintosh MC352. I would creit the autoformers as acting as a buffer to absorb the changing impedance without causing damage to either. For the 9's I would use at least a MC402 or a MC602 if you can swing it. All my humble opinion of course.