Size of Midrange Drivers

6.5" midrange drivers in my Hyperion HPS-938 speakers
cover range of 230-3000Hz. They have ferrofluid suspension
instead of traditional "spiderweb". Here is what
hyperion says about it:

"The Magnetic Fluid Damping System (M.F.D.S.) is
another innovative design for our revolutionary speaker
drivers. The S.V.F. driver does not have a spider, which is
an essential part of conventional speaker drivers for
holding and stabilizing the sound coil. Although the spider
is important for conventional speakers, it is also
considered as a source of vibration and sound coloration.
Our M.F.D.S replaces the spider completely, increases the
driver speed dramatically, and enables the purity of sound
reproduction."

[url]http://www.hyperionsound.com/HPS-938.htm[/url]

These relatively inexpensive speakers have one of the best
midrange I've ever heard. Unfortunately company went
bankrupt in spite of very good product (poor marketing, poor
dealer base).

If you consult the wavelength calculator, you'll find that a 6.5" driver starts beaming at 2086 Hz, whose wavelength is 6.5". By the time you get to 3Khz the wavelength is 4.5", which would be a total beam from a 6.5" driver.

This beaming isn't noticeable on-axis, especially if you're listening nearfield, but it disrupts the in-room power response and you'll get cupped-hands sounding suckouts right in the midrange where it counts when you have too large a midrange crossed over too high to the tweeter. A 6.5" mid crossed over at 3Khz will beam from 2K to 3K Hz--1/2 an octave in the midrange.

Johnyb53, I cannot hear that. Perhaps others couldn't hear it either since it received whole bunch of awards including Absolute Sound "Speaker of the Year" 5 years in a row, Enjoy the Music "Best of 2004" and "Decade Award", Stereo Times 2005, 2006 award, Blue Moon award and many glowing reviews like this one: http://hyperionsound.com/Images/Hear%20the%20Hype_low_res.pdf

Perhaps one shouldn't judge speaker sound by one calculation?

Johnnyb53, are you saying that all 6.5 inch drivers start beaming at 2086hz....???

It's not hard to look up Tim.