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I’ve gotten several reports of this site setting off virus warnings. I was unable to find any viruses myself and McAfee SiteAdvisor reports the site as OK. However, I haven’t upgraded the underlying WordPress software in a while, so last night and this morning, I did a full back-up and completely reloaded the site from scratch with WordPress version 2.3.3. If you noticed that ClariSonus was down during that time, that is why. There have been some changes in WordPress which have caused a few things to look strange- I will soon fix them, if I can.

If anyone still gets a virus report or sees problems with the site, please e mail me at atwood (at) one-electron (dot) com (you put the address together - this helps avoid spam). I will try to track down the problem.

One other thing: As I mentioned in a previous posting, my main computer crashed right after Christmas. After putting in a new hard drive, it worked for about two weeks, then crashed again, this time with signs of flakiness in either the motherboard or power supply. This was an old Pentium 4 system, so I decided to upgrade. I purchased and recently received an Apple Mac Pro. I’ve switched a lot of my software over to the Mac, but I can still run Windows using the Parallels program. So far things are working well, but I am still sorting out and getting used to the new software. My “music computer” is still a Windows machine, and I don’t have any immediate plans to change it.

Update: (Feb. 10) - The specific complaint against the site was that Trend Micro’s PC-cillin flagged this particular file: www.wp-stats-php.infc as containing spyware. With the clean-up I did yesterday, this file no longer exists, so at some point Trend-Micro will take ClariSonus off it’s spyware list.

Update II (March 10): - I’m still getting reports of a “worm” malware virus on the ClariSonus site. I am able to see it using Avast! anti-virus software. If your anti-virus software is up-to-date, you should have no problem. I have reloaded the site again, but the virus was present immediately upon opening the new site. I may have to work with my ISP or in the worst case change ISPs. I’m working on this.

- John Atwood

This is a contrarian view of loudspeaker dispersion. I’ll start by saying dispersion isn’t directly audible, unlike frequency response variations, energy storage in the time domain, or nonlinear (IM and harmonic) distortion. That isn’t to say dispersion characteristics aren’t audible - they are, but not in the way usually described in the literature.

Let’s start with a visual metaphor - imagine a multicolored mirror-ball, with red representing 20~100 Hz, yellow 100~300 Hz, green 300 Hz ~ 3 kHz, and blue 3~20 kHz. This mirror-ball is a visual representation of the loudspeaker, with most of its energy coming from the front. The front portion of the mirror-ball is close to white, and the rearward portion is deep red. Along the side, there are twinkly fine-grained yellow, green, and blue colors - these are diffraction artifacts, many of them visible only over a few degrees. Move just a little bit, and you’ll see a rainbow of colors shimmering off the cabinet edges, as well as interference fringes between the drivers.

When you sit in front of the mirror-ball, it is close to white (representing flat response) but there are twinkly multicolored artifacts coming from the edges of the loudspeaker enclosure (diffraction). As you walk around the loudspeaker there are a rainbow of twinkly multicolor diffractions artifacts, until you reach the dead center of the rear of the speaker and see a red glow from the center surrounded by the multicolor diffraction artifacts coming from the edges.

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