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Infinity Kappa 8's


What to do? My infinity Kappa 8's keeps eating amps for lunch.The 1st failure was with a Yamaha 200 watt per channel model P2200. Amp went black, I replaced the main fuses on the back of amp, it powered-up with new same rating fuses and then amp died again for good.Tryed another P2200 fuse blew again. I've decided not to try the amp again, for fear of completely damaging my last P2200. This is getting expensive! I'm not cranking the volume at full tilt or pushing the bass tone control past 12 o'clock. The speaker can be Bi-amped, but I've just used a single robust P2200 on them. The speaker wire uses large 1/4 inch bananna connectors, so no bare wires can not touch positive to ground on the back of the amp or speakers and the 4 binding posts on the speakers flat metal plates to connect the two binding posts together for single amp operation. Could a faulty cross-over wreak this havoc upon me. Any helpful suggestions will be greatly appreciated.
audiosaurus

Showing 2 responses by sonicweaver

sonicweaver
2 posts
 
I did the removal of the 12.5mH (but did not bypass the caps) mod last night on my Kappa 8's. My Rotel 1090 can go quite a bit higher now before going into protection and it runs cooler. I did not notice any significant changes in the bass response.

I plan to put in a SPCO switch that will provide normal mode, extended mode and allow the 12.5mH coil to be bypassed. This will let me compare the mod's sonics quickly rather than though the half our change over memory.

The stock Normal/Extended mode switch simply bypasses the 5 ohm, 50W resistor. It does not bypass the 12.5mH inductor which is always in circuit.

The previous owner of my Kappas did some work on the xovers and got ohms law wrong. He replaced the 5 ohm resistors and apparently couldn't find 50Wer's. He correctly put two 25Wer's in parallel to cover the 50 watts but incorrectly used 2.5 ohms think the value summed like the wattage. So the resistive value was 1.25 ohms rather than 5 which meant they were always running closer to extended mode. Explains why I didn't hear a difference and my amps still went into protection mode at the volume setting, regardless of the switch's setting.
sonicweaver
2 posts
 
The Kappa 8.1's do not have the 12.5mH inductor and present a higher impedance load to the amp than the 8's.

I would keep the stock driver and just replace the surround. It's cheaper and you will maintain the designer's voicing and specs. There are bunch of folks that sell kits, with the foam glue and instructions...check eBay or goggle.
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