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Re: Sigh...

Hi John

I have to grant you that I am not “current” on what goes on in the hifi trade mags, it has been some years since I paid any attention.

On the other hand, I probably have more familiarity with the process than you might imagine. I have been interested in sound and hifi since I was 9 so this has been the major direction in my life for the 45 years following.
I have had around 100 product articles or reviews on products I developed, contributed technical input in several Audio magazine articles, I have written about a dozen technical articles published in trade mags over the last 20 years and had a friend (Dan Sweeny) who I met when he wanted to review the Servodrive Contrabass for “Perfect Vision”.

To be honest, I may be totally wrong about the current “state of the art” in hifi magazines, things may be different now and I will look to see “what you do”.

As for “ambitious claims”, they are not claims when they were measured by an independent acoustic testing lab. In fact, they were measured in near excruciating detail from every angle. These measurements are needed to produce a 3d model of the speakers radiation pattern, needed in high end room design.

Down load the free CLF (common loudspeaker format) viewer and then load the data files for the sh-50 0r sh-100. The viewer has many views of the speaker available if you play with it. For example, one can find the response at any angle, view the radiation as a spherical projection that can be viewed at any angle and so on.

http://www.danleysoundlabs.com/knowledge baSE.htm

A better explanation in a trade mag review.

http://www.danleysoundlabs.com/pdf/Danley SH-50 - Pat Brown - Live Sound May-2006.pdf

As for reproducing a square wave (or another complex signal like music), that is not a test per say but can be replicated with an oscillator and measurement microphone.
Essentially anywhere over the coverage angle, it will reproduce a square wave input, anywhere from near perfect to fair from about 220Hz to about 2.6KHz,.

Being a stereo guy, you might enjoy a recording I made with a microphone invention I am working on. On the first link, at the bottom is a sound file, try this on some good headphones or a wide dynamic range system (read warning first, start at low volume).
Best,
Tom Danley

http://systemscontractor.com/articles/publish/article_977.shtml

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