Help power pair of Infinity Kappa 9's please


Hi all!
I have a pair of Infinity Kappa 9's:
Nominal Impedance: 4 to 6 ohm
Power Rating: 60-340 watts RMS
Efficiency: 102 dB SPL @1 watt, 1 meter
Crossover Frequencies: 80Hz, 800Hz, 4500Hz
Frequency Response: 29Hz-45kHz +/-3dB
Physical Attributes:
1x - SEMIT Supertweeter
1x - EMIT Tweeter
1x - 3" Edgewound Voice Coil Polydome Midrange Driver
1x - 5" Polypropylene/graphite Diaphram Polygraph
2x - 12" Cast Frame , L/C Tuned Woofers
Dimensions: 59.5"H x 21.5"W" x 8"D

My room is 12'x12', I have $2500 budget and would like to play music off my computer. I need amp(s), a preamp, and a DAC i guess (is the DAC necessary at my low of a budget range?). I know my budget is low so I will be shopping for very used/old equipment. If anyone has any experience, suggestions, or words of wisdom, they would be very much so appreciated.
Thanks,
JT
jtiesel2
Agree with above post,those speakers are amp-killers.Anything besides a high current amp will melt.2500$ 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.
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Your budget is waayy too low to power the Kappa 9. They need more power than you are willing to spend. The kappas will play extremely loud, you just need to bi-amp them. I have four pair of Kappa 9. I bi-amp them with Carver Silver 9t monoblocs and they sing their hearts out. If you can't afford to bi-amp them, there's no point in owning them. Kappa 8.1 or Kappa 7.1 will be a better fit and they will sound really good in a room your size and won't be nearly as difficult to power as the Kappa 9. On resale, you won't get the $2k you mentioned, it will be more like $1200.
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