reggaenaut
Addicted Member
Danny did his thing on the Yamaha NS 1000M and....
Danny versus Yamaha NS 1000M
- Thread starter reggaenaut
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flavio81
Turntable technician
So, the guy gets a speaker that perhaps has capacitors that have drifted a lot, and that perhaps needs service, making sure the surrounds are OK and that the cone has not been stored in a humid location, etc. and proceeds to measure it as it is, as if it was a sample of a healthy NS-1000M.
Then he goes on a lot about the measurements. Of course he needs to show them so the customer sees that objectively his/her speaker was improved. But I wonder if he actually listens to speakers.
The Yamaha NS-690 and -690II are almost universially liked speakers. I've owned the 690II and the little brother 670. The NS-1000M is like a -690 where the silk domes were replaced by beryllium domes and the midrange was beefed up in magnetic flux density. It can't really sound bad...
But even looking at his mearurements, he never ever shows at impulse response or step response. Hint, hint! The magic of that speaker is in the impulse domain, not in the amplitude domain. He doesn't do any distortion measurements either. On the Martin Colloms book, which is well known, the Yamaha midrange Be driver is mentioned to be the midrange driver with the least distortion measured yet (at the time of publication).
Still, compliments for restoring and improving the speaker. Although Troels Gravesen already addressed many of the problems with the original crossover with an improved crossover design, and got a ruler flat freq response, if anybody feels the need for that.
Genelec already, years, decades ago, used the NS-1000 and modified into a fully active Genelec speaker.
I would run it fully active, as well, if it was mine.
Then he goes on a lot about the measurements. Of course he needs to show them so the customer sees that objectively his/her speaker was improved. But I wonder if he actually listens to speakers.
The Yamaha NS-690 and -690II are almost universially liked speakers. I've owned the 690II and the little brother 670. The NS-1000M is like a -690 where the silk domes were replaced by beryllium domes and the midrange was beefed up in magnetic flux density. It can't really sound bad...
But even looking at his mearurements, he never ever shows at impulse response or step response. Hint, hint! The magic of that speaker is in the impulse domain, not in the amplitude domain. He doesn't do any distortion measurements either. On the Martin Colloms book, which is well known, the Yamaha midrange Be driver is mentioned to be the midrange driver with the least distortion measured yet (at the time of publication).
Still, compliments for restoring and improving the speaker. Although Troels Gravesen already addressed many of the problems with the original crossover with an improved crossover design, and got a ruler flat freq response, if anybody feels the need for that.
Genelec already, years, decades ago, used the NS-1000 and modified into a fully active Genelec speaker.
I would run it fully active, as well, if it was mine.
flavio81
Turntable technician
Genelec S45 YA
The finnish already showed Danny (and the world) how to do things, decades ago. Apparentñy this model is from 1978.
Fully active, the way things should be if you are very concerned about measurements and about non-optimal vertical dispersion due to crossover slopes not being steep enough.
The finnish already showed Danny (and the world) how to do things, decades ago. Apparentñy this model is from 1978.
Fully active, the way things should be if you are very concerned about measurements and about non-optimal vertical dispersion due to crossover slopes not being steep enough.
fredgarvin
Super Member
Good info from Danny. I doubt that the fellow that sent in the speakers was looking for an active solution.
homebrew
Super Member
Danny made some valid points in his evaluation. He measured each driver independently and the spl curves and driver ringing charts were not very good. That implies a lot of corrective crossover circuitry for the drivers to operate correctly. Kind of like forcing square pegs into round holes.
