Detailed information on Helix-mf140

The 3D-Spiral Horn Speaker Building

Detailed information on Helix-MF140

Added on 17. Jan. 2008

	The all parts. Fins were glued on the side plates. There were questions inquiring the reason of using fins. The reason is the easiness of the building. If you feel it is easier to use single plates, it may be right.
	Trial assembly 1.
	Trial assembly 2.
	Trial assembly 3.
	Trial assembly 4.
	The finished assembly.

Measurements of Helix-mf140

Added on 17. Jan. 2008

Because of malfunction of the microphone (Primo EMU-4535-2), the new one (Microphone Madness MM-TMM-1) was used.
Therefore, a direct comparison with old data is not appropriate.

Resolution 21.53Hz ; Span 22050Hz
Magnitude -140 to 0 dBFS (FS : full scale)

measured with FF85K

listening position

stereo,2m,center

mouth output

mono
center
(border of the mouth)

High resolution measurements

Resolution 5.383Hz ; Span 5512Hz
Magnitude -140.0 to 0.0 dBFS

	listening position stereo,2m,center
	mouth output mono center (border of the mouth)

Impedance measurements

Vertical axis has an arbitrary linear scale and is proportional to the impedance of the driver.
Resolution 5.383Hz