Tweeter horn

[epilot]

Hi guys,

As we know the higher frequencies are much directional than the lower ones, So why most of tweeters use a horn?

Thanks

[AllenB]

Hi epilot, are you saying that directionality is not a good thing?

[Pano]

Not sure what you mean. Higher frequencies are not "more directional" and most tweeters I see do not use a horn. (tho all I use do)

[Helmuth]

Originally Posted by epilot

Hi guys,

As we know the higher frequencies are much directional than the lower ones, So why most of tweeters use a horn?

Thanks

Horn increases efficiency 112dB 1Wmtr sphere is 100%. Some horns have 115dB 1Wmtr so even more then 100% in one direction.

The HF-directivety can be much better with a horn then a dome tweeter. I mean line array one's or with a slit 140 degree directivity horizontal.
http://profesional.beyma.com/ingles/pdf/CP21F.pdf
http://profesional.beyma.com/ingles/pdf/WL4.pdf
The pressure is pushed though a small slit and then spreads on a large angle when coming out of that slit. Because the pressure wants to spread over the lower pressure surrounding area outside the horn.

The horn loading also improves the impulse behavior. For the piston(dome) in the HF-driver is it like it is as big as the horn mouth. But it still has the same low mass.
So you have a better mass drive force then a normal cone driver with the size of the horn mouth and there for also less loss.

Most dome tweeters use a waveguide not a horn to give the pressure more, a direction and have better controlled directivery also above 10kHz. Like this qaulity classic scanspeak 19mm tweeeter although it is old it has all the technical solutions to do a perfect job. With its wave guide.