[D OB G]

Further to the "Audiosyncrasy" pictures, I now have Praxis, and can offer a graph.



The top traces are of three nearfield measurements of the top woofer taken at approx 1 cm and superimposed- 4, 7 and 10 sec chirps.

The three lower traces are of the lower woofer (slightly different distance to the dust cap), once again 4, 7 and 10 sec chirps.

The inductor is 32 mH.

Using this nearfield technique appears to only be valid to about 100 Hz.
The vertical scale is 3 dB per octave.
The graphs are octave smoothed.

David

[panomaniac]

I found a high-Qts 15" driver from Selenium that looks even better than the Hemp.
http://www.seleniumloudspeakers.com/site2004/catalogo/pdf/wooferpw3_15pw3_15pw3-slf_new.pdf

Yep, that's the driver I use on my OB rig.  A great sounding driver with a progressive spider to keep you out of trouble. Does not seem to have the nasties on top like a lot of 15s.

David, YGM.