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Old 8th April 2013, 03:32 AM   #1
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Default Will these speakers work?

I bought a pair of speakers at a pawn shop for 20 bucks hoping they would be a cheap way to experiment with power amp design without having to spring for nice speakers just yet. Sort of like expendable lab rats so to speak.

Anyway, the speakers are Yamaha NX-S75s, and a little googling showed that they are from a discontinued Yamaha bookshelf system called the Yamaha CC-75.

Here is the part that has me wondering if they will work.

On this page CC-75 - Mini-Systems - Audio & Visual - Products - Yamaha United States

I found the following paragraph:

"Exclusive Yamaha system allows the amp and the speakers to work together to boost the power of a stereo speaker's output . Instead of an ordinary woofer unit, the speaker has a Helmholtz Resonator that intensifies the sound waves inside until they are output as much stronger sounds. Total impedance (resistance to current flow) has to be zero, so the amp's circuitry produces negative impedance, canceling out the speaker impedance. The result is a bass sound that is very powerful."

The specs say the amp involved produced 55watts per channel into 6 ohms, and that the actual impedance of the speakers is 6ohms.

My question is, will this wacky woofer system cause problems with an amp not intended for it, or is it just a thing where the bass gadget they're talking about won't sound as good (or lame? ) as it could?

These are three way speakers, so I assume that there is some sort of crossover in there, and the fact that the mid and high end speakers need to work alongside this silly bass thing suggests to me that the "negative impedance" they talk about must be implemented in the crossover, meaning that it should work fine with any amp I build that is happy to see 6 ohms.

Any thoughts?
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Old 8th April 2013, 08:59 AM   #2
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by Dan Moos View Post
My question is, will this wacky woofer system cause problems with an amp not intended for it,....
No

Quote:
Originally Posted by Dan Moos View Post
...or is it just a thing where the bass gadget they're talking about won't sound as good (or lame? ) as it could?
Yes

Quote:
Originally Posted by Dan Moos View Post
.....suggests to me that the "negative impedance" they talk about must be implemented in the crossover,...
No, it's the amplifier that produces a negative output impedance. Using that amplifier with the wrong speakers could cause some fireworks, but your speakers should be harmless.
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