Infinity Kappa 8's

Having owned Infinity since the early 70's, and Kappa 9's were here for a while I can tell you what you need to do.
You won't like it but you need to step up to an amp capable of handling a 2 ohm load, one with high current capability. Me, I like levinson, on my current pair of RS1b's, I'm using a vintage ML3 levinson on the woofers, no problem.

I would suggest Classe, older Krell product, Levinson 333 or 336. Do not even think of anything under 200W/channel.

Step up to the plate and give the Kappas what they want. Until you do, you will continue to have problems.

Best,

Paul :-)

Those speakers drop down to just under 2 ohms at 90 Hz. The Yamaha might be seeing that as a short. I have tried several amps on Kappa 8's and never had that problem. The Kappa 9's were notorious amp killers in their day as they dropped below 1 ohm. Yamaha did make some very good amps at some times and I had the B-1's, for a while, in a biamp setup with the Kappa 8's. The bulk of Yamaha gear is commercial quality.

If you have a multimeter, you can test for the speaker terminals for a short using the DC ohms. Zero would be bad. Four ohms would be nominal. If that checks out, it will be time to decide if you need a amp that can drive 2 ohms or different speakers.

Speakers are drawing too much current. Krell Ksa200,ksa250,ksa300 ect will drive the #$%^ out of them and not even cough.

I used an Adcom 555 and an Aragon 8008BB to drive the Kappa 8's when I had them.Both amps did the job.

Larry

Thanks for all of the helpful comments out there. The Yamaha P2200 has driven Apoggee Caliburs and Mb Quart 980's, both of these speakers dip into the low,low impedance area, and the amp never popped a fuse or shut down. Remember this is not a consumer amp, but an amplifier that has proven it's reliablity over the years in many studios. Upon further investigation I noticed a very well concealed setting for the woofers under a plastic cap located outside the speaker binding & controls plate. The factory setting is extended range. Infinity suggests throwing the switch into the normal position (which it already was in) to reduce the current requirements to the woofers. Next step suggested I'll take, is testing for a short with an ohm meter. These are the other amps I have available to drive the Kappa's. Yamaha M80 & M85 (both 200 watt range)and a friend has a Sumo polaris.Sorry but a Krell, Levinsen and Classe at the power required is just outside of my budget.