Help power pair of Infinity Kappa 9's please

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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.

As far as the Andromeda comment vs the Aragon. The Andromeda II or III would not drive this either, only original Andromeda, if that is what they compared the Aragon with, I still understand it. The Aragon had better midrange than the Andromeda. The Andromeda was so controlled that an under damped speaker sounded week on bass and it was a lean dry sound which the emit tweeters would sound very fast, but very dry. I wouldn' like the Andromeda on these speakers. If they thought the Aragon might drive them and were a Aragon dealer, I can see them sending you that way. The original Andromeda was stopped being manufactured in either 82 or 83. You were probably looking at one of the non Bongiorno amps. The sounded quite nice, but did not have the current capability.
The original Andromeda ran on 50 volt rails. Jim himself called it an arc welder.

When I mentioned car audio, I was really thinking about the low impendences (which are similar to car audio), and did not even think of using car amps, but now that you mention it..........
The kapppas would sound great with a Phoenix gold 450 or Zapco running them for sure.
I have alot of respect for the musicallity of some of the car amps.
I own some premium 12volt products myself.
There are some truely excellent car amps on the market, as refined as any home amps.
As far as sound quality goes, I would give the advantage to DC current!
I would worry about the electrical conversion though.
Ac to Dc.
May introduce some noise and negative effects.
Not really sure.