Back Loaded Horn Bending

[pinkmouse]

http://www.klangform-akustik.de/

[planet10]

Originally posted by pinkmouse
http://www.klangform-akustik.de/

Thanx PM... i rember passing by that bookmark... they look to be yet another maker of cool-looking horns



dave

[Tyimo]

Hi!

Thanks, I already read the infos on the Klang-form akustik's site and also the dialog of Till Roemhild on the:

http://www.audiomap.de/forum/index.p...id/19186/page/

My question is:

Am I undersand theirs BLH method well?:
-the BIG pressure chamber behind the driver is tuned to the driver Fs. So Fc=Fs=55Hz ( The horn will amplify only the frequencies under the Fs and there will be no interferency between the horn's and the driver's direct radiations.)
-the Horn mouth tuned to 35 Hz = 4500cm2
-the horn lenght tuned to 45Hz = 1.2 m (?)
,but 1.2m=71Hz (!) and 1.91m would be the correct lenght for 45Hz. Are They sum up the pressure chamber lenght with the horn lenght to get the 1.9m?

Tyimo

[planet10]

Originally posted by Tyimo
Am I undersand theirs BLH method well?:
-the BIG pressure chamber behind the driver is tuned to the driver Fs. So Fc=Fs=55Hz ( The horn will amplify only the frequencies under the Fs and there will be no interferency between the horn's and the driver's direct radiations.)
-the Horn mouth tuned to 35 Hz = 4500cm2
-the horn lenght tuned to 45Hz = 1.2 m (?)

It is much more complex than that....

as an example.... for free space loading, the horn would need a diameter of 1566 mm to reach 35 hz Sitting on the floor you could divide the area in half.

dave

[Tyimo]

Yes,offcourse, but what about the short horn line lenght?

Tyimo

[planet10]

Originally posted by Tyimo
Yes,offcourse, but what about the short horn line lenght?

Ideally a horn should be at least a 1/4 wavelength long at its cutoff... short-horns have a lot of reflections and perhaps are better called wave-guides.

dave