High Efficiency Speaker Asylum: It just goes to show... by Charles Hansen Need speakers that can rock with just one watt? You found da place.

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Posted by Charles Hansen (M ) on July 18, 2005 at 21:20:07

In Reply to: pertinent research posted by EGeddes on July 18, 2005 at 18:51:02:

...the limitations of double blind testing.

Assuming that the same good horn (waveguide) was used when comparing the B&C 1" driver to the TAD 2001, there should have been quite obvious sonic differences. This is due to the colorations introduced by diaphragm resonances.

The TAD has a 48 mm beryllium diaphgragm that has a first break-up mode of over 20 kHz. B&C makes several different 1" drivers with diaphragms of either titanium or mylar, with diameters of either 25 mm, 36 mm, or 44 mm. These diaphragms will have first break-up modes somewhere between 3 kHz and 10 kHz. The sonic differences between these two approaches are, as I said, quite obvious to a reasonably skilled listener.

Either there was some flaw in this particular double-blind test (poor listeners, poor equipment setup, et cetera) or some flaw in double-blind tests in general (high stress levels in the listening panel, et cetera).

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