Originally Posted by silvershark
I wanted to make sure these are good quality parts and will push my speakers correctly.
Currently I have an old Analog Kenwood KR-5070 Receiver that does 85wpc but my buddy is telling me they wont drive the Kappa 7's correctly and should look into individual components.
These old Kappa 7's are legendary for their nasty, nasty (did I say nasty?) pathological impedance curve:
Note the dips below the forbidden 2.0 ohm line and even the doubly forbidden 1.0 ohm line, centered at 32 Hz and 7 KHz.
These speakers aren't fit to be driven by any real world amplifier, whether separates (even monoblocks!), in a receiver, or by a mule skinner high on meth!
He is letting me borrow an adcom preamp right now along with a Yamaha M-70 amp. The main difference that I can audiably tell is that the hissing or static that my Kenwood introduces to my current speakers is gone with the pre-amp and the amp.
That of course has nothing to do with the nasty, out-of-date, not properly-designed when they were new Kappas.
My current Sony just sounds like crap to be honest.
The Yamaha M-70 is a classic, and might just be a very good match for these speakers, such as they are. The M70 has puts out a conservative 200 wpc, and if memory serves it is a MOSFET design. This makes it a better choice for driving badly-designed speakers.
Some of the newer receivers that are rated for driving 2 ohm loads might work out.
When people say that just about any well-designed amp can properly drive just about any well-designed speakers, the equation doesn't hold in this rare case because these speakers, with their dips down below 1 ohm, simply aren't well-designed. Back in the day, a pair of Kappa 7s might leave a trail of burned and charred Flame Linear 700s behind them. In modern times, most good amps that are bad choices just go into protection mode, save themselves, and sound like piss at unexpectedly low volume levels.