Megaphone question

[dr.power]

Hi guys,

As I know a horn just has a MOUTH and a THROAT. So What is that I showed in the below pic used in almost every megaphone???! Why the megaphones use that?

Thanks a bunch

 

[4pyros]

Its part of the horn. A reverse horn if you will. It makes the horn path longer. It also serves as a plug to help spreed the sound.
It is sometimes called a utility horn. I could not fine a good drawing on the net. Maybe someone else mite have on.

 

[ronsimpson]

Some times it is called a folded horn. If you take off the piece pointed to, and rotate it 180 then attached it to the back side of the horn you will get a horn that is twice as long.

 

[Nigel Goodwin]

It's usually called a "re-entrant horn", and is the common choice for PA horns.

 

[canadaelk]

Reentrant Horn:

 

[Nigel Goodwin]

Nice attachment

 

[4pyros]

It's usually called a "re-entrant horn"

Wow I could not come up with that name.

http://www.vias.org/crowhurstba/crowhurst_basic_audio_vol1_050.html

 

[Nigel Goodwin]

Wow I could not come up with that name.

I dragged it from the depths of my memory