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Help powering pair of Infinity Kappa 9's

by jtiesel / September 5, 2010 9:24 AM PDT

I own a pair of Infinity Kappa 9's that I am trying to find power for.
Owners Manual Specs:
Nominal Impedance: 4 to 6 ohm (recommends amps that can go lower)
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 specs:
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
These speakers are 5ft tall and require lots of power to run. In the manual it says that each speaker can be bi-amped and recommends giving the most power to the woofers.

I'm looking for people who have experience powering heavy duty speakers to recommend a budget (I will be shopping ebay, craigslist, and sites like overstock.com) solution for the power needs of these speakers. Any thoughts, experiences, or words of wisdom would be much appreciated
Thanks

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Amps for Infinity Kappa speakers
by Kateri Tekakwitha / September 27, 2010 9:16 AM PDT

I have owned a pair of Kappa 8 speakers since 1989. Their specs are identical to the 9's, the difference being that they added a SEMIT super tweeter in the 9's. I bi-amp them with 2 Adcom amps. I use an Adcom 555 200-watt amp for the bass speakers and an Adcom 535 60-watt amp for the mids and highs, which had a reputation for an especially sweet sounding amp. My 8's sound great, with that distinctive Infinity sound, but they are power hogs and very unforgiving towards amplifiers. They are notorious for dropping down to 1 ohm in their power demands. When they do, they demand all the power that the Adcom 555 can give, just to the bass, to the point of making the lights dim in the room. I always have to have a supply of 6 watt fuses on hand, so I can replace the blown ones and get the amp running again. The Adcom 535 has only blown 1 fuse, and that just recently, in all these years. As a result, you get to know where the safe positions are on the volume control of the Adcom preamp, as well as the sound levels being produced. I also bought a sound pressure meter from Radio Shack, so I could be more precise. I have found 102 db is about all I want to push the amps to in sound levels. Peaks of 104 db is ok sometimes. That is a lot of sound in the room. Lots of people say on the web blogs that they use Adcom amps. They make the Infinity speakers sound really sweet. I've always loved the Infinity sound and still do. I recently read, that if they were being produced today, they would be about $10,000 for a pair. I paid $2,000 in 1989. Best money I've spent on stereo equipment. The more power you give them, the better they sound.

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Powering Infinity Kappa 9's
by wongfei-2009 / February 4, 2011 2:22 PM PST

Not sure if this is out of date,only 4 months, but feel the need to post anyway cuz any Kappa 9 owner is holding on to something special. Almost every post I've read, here and elsewhere, recommends bi-amping. Sure you can bi-amp with 2 ample amps but I say go for the gusto. I have never bi-amped. I have a McIntosh MC2500 which produces 500 watts a side. It is a HUGE heavy amp that dishes out more than the Kappas can handle. In over 20 years it has never had any issues. I've reconed the woofers once during that time. In short, Go McIntosh. They are some of the best American HiFi amplifiers ever made and there are plenty of different models on the used market. An MC2500 or 2600 can run $3000. Worth every penny. I'm sure more affordable models will also do the job for say, $2000, maybe more, maybe less. No need to bi-amp, which might cost even more.Do yourself a favor and pull the trigger on McIntosh. Hope this was helpful.

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Yeah for the Mac!
by tfarney / April 11, 2016 10:39 AM PDT

I've had Kappa 9's since 1988
Ran big 250 watt Yamaha until I got my MC2600, Cobalt cables
OOMPH!, crisp, clear and I have not have to refoam.
My MC 2600 was brand new, cost was ~6K, freight shipping, weighs 120 lb +/-

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Aww- that just makes me miss my old gear ;(
by Pepe7 / April 11, 2016 11:40 AM PDT
In reply to: Yeah for the Mac!

Before the kids and house took over, anyway Wink

I really need to upgrade again at some point to another Mac(!)

cheers

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