Help power pair of Infinity Kappa 9's please

Timlub is right on. Power is not an issue with the Kappas by and large. It's all about current, since the impedance drops ridiculously low. You need a very high current capability amp.

Tim, when I bought the Aragon, I looked at a Sumo Andromeda amp. The dealer recommended the Aragon, which was a bit cheaper than the Sumo, specifically to drive the Kappa 9's. Maybe he steered me wrong. But I'd still like to see the Andromeda drive these things at top volume for 30 minutes and not fail. I'd be pleasantly surprised. Just have a hard time believing a single Andromeda could do what a bi-amped configuration of an Aragon and Audio Research amplifiers could never come close to pulling off. Granted, Audio Research's solid state designs weren't that good (by AR standards), but they weren't exactly wimps, either....but the Kappas made them seem so. Furthermore, if these speakers could make an older Levinson amp cry uncle, well......

Timlub, since apparently you know about the speakers in question, what is the phase data? While <1ohm is wacky and phase at that impedance is probably just academic, I'm curious now.

What does anybody do, or HOW does any manufacturer justify this kind of bizarre load? And SERIOUSLY, what good is it?

I believe in system synergy and all that good stuff, but buying speakers which require owning stock in the power company AND an EE degree to find compatible stuff is beyond me.

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All that aside about the Kappa9 being amp killers and being poorly designed, I'm so enamored by them that I own four pair of them. If you put a killer preamp in front of them with a good source and the appropriate bi-amplification, you have yourself an outstanding speaker. They are not a speaker to own if you are not willing to amplify them properly. If you can amplify them properly, they are keepers for life. Big, beautiful and they sound outstanding when done right.

But, you can always ignore the naysayers here and try it for yourself and come to your own conclusion. If you try it and are successful, you should come back to this forum and post your findings. As a matter of fact, if you are not successful, you should post those findings also.
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When you are talking about those kind of low ohms, I can't help but think of car audio.
The lower the impedence, the more power you can put into it.
I am sure they are designed to take the power.
I would seriously look at the pro stuff if I was in this situation.
Since they are designed as such, I am sure they could take the power of a pro amp, or they would not have been designed with that impedence in the first place.
They want power, give em power!
The only reason consumer speakers are designed with an 8ohm impedence is to play nice with the 88 billion receivers & sub par amps on the market.
If they wanted to put some power into their speakers, they would not be 8 ohms.
Do some research.
Apogee, Crown, Creston, and some of the Mackie amps sound good, and would not have a problem with your Kappas.
You might just find Nirvana (literally) with the right pro amp.

I do not have them, but if anyone can get proper driver specs a impedance compensation circuit could be added. I worked at SpeakerCraft/Marcof Electronics in the early 80's we used this circuitry then, we had great computer programs, but it was still a guessing game. Today, we can model exactly how a speaker will behave. Unfortunately, I doubt the information is available on the infinity's. As far as Phase data, You'd have to have the original crossover design and crossover points along with impedance curves to figure that out. I remember measuring one of these and it dropped to .8 ohms at one point.
The car audio idea is not crazy. The old Orion HCCA or SoundStream Reference amps were capable of 1/2 ohm loads. We actually ran a few speakers in living rooms with surprisingly good results, but these amps require big current. You would need 14+ volts and you wouldn't get away with a cheap power supply.