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Re: The review

Posted by klausDK (A) on March 30, 2007 at 02:41:57

In Reply to: The review posted by KlausR. on March 28, 2007 at 05:28:06:

I wonder about the resonance at 300-500 Hz.

Cumulative spectral-decay plots shall only be used with care and will require a big or anechoic measurement room if you want to make any useful conclusions for frequencies as low as 300 Hz. Considering this supposed resonance is right smack on top of the crossover frequency at 350 HZ I wonder if it isn’t a phase abnormality from the chosen passive crossover. If this is the case then it will obviously be much less intruding than if it had been a proper resonance. Looking at the construction materials etc. I will have to say that the only true type of resonance I can imagine at all will have to be standing waves!
Still it would be fun to see how it would measure, and sound (!) if the crossover between bass and mid was handled by a very high order digital crossover with some phase compensation.

I feel cumulative spectral-decay plots at low frequencies should be used much more to determine speaker room interface rather than just to look at the speakers in isolation.
In a way you could say that is exactly what Audio has done by not filtering the response like Stereophile do. But what I really would like to see is a plot running for 20 milliseconds rather than 4 milliseconds.

Before typing this reply I have had a look at Kef’s homepage because their reference series share the same construction philosophy as the Pioneer. And hurray reviews of the new Reference series is by now being presented there. They have a a non functioning link to a “Stereo” test of the Kef R 205.2 and this test of the R203.2

http://www.gp
acoustics.de/Reviews/pdfs/Stereoplay/Reference_203_2_Stereoplay_04_07.pdf

Its on axis frequency response is actually better than the Pioneer and within its frequency range as perfect as we are ever likely to see from a passive box. And I would not be surprised if its dispersion control wasn’t basically identical to the Pioneers.
Then again it gets a good review so it doesn’t inflict with your statement/view!

On Kef’s homepage they have pictures of the crossover boards from the Reference series and they look almost like parts of an amplifier, utterly filled with components 40+
Some believers in the “less is more school” will argue that this is newer going to sound good. I say one has to use the amount of components which is needed, no more no less.
B&W and Kef was once more or parallel running companies which seem to follow the same engineering path. Now their ways seems to divide, and I like more what I see from Kef rather than B&W.

Best wishes from Sunny Copenhagen.

KlausDK

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