is this a horn or a waveguide?

[mondogenerator]

Ive just ordered a couple of these:

CELESTION|H1-7050|HORN FLARE, ALUMINIUM, NO BELL | CPC

further details:

http://professional.celestion.com/pro/pdf/H1-7050.pdf

question(s):

Is this a horn or waveguide?

Has anyone got any experience of using it, and is it any good?

to me it looks a little waveguide like, but its exp flare so im hesitant to think so.

thanks for any help

[speaker dave]

Maybe its just semantics but I always thought that all horns were waveguides. If it uses a compression driver I would definitely call it a horn (as well). If it was just a flare on a dome tweeter, increasing directivity, I would call it a waveguide.

If it is straight exponential it won't be constant directivity, will get progressively narrower at HF.

David S.

[mige0]

Hi

There is exactly *no* difference between a horn and a waveguide - its all just "sales speaks".

What *any* shape of horns and waveguides does, is guiding / aligning diffraction, which results in a variety of parameter shifts.

[ScottG]

Originally Posted by mondogenerator

Is this a horn or waveguide?


thanks for any help

..relatively synonymous,

All horns are waveguides, they trade/limit/compress dispersion for gain.

Not all waveguides are horns, some alter dispersion through absorption.


That unit is both a waveguide and a horn.. however it is *primarily* a waveguide, so it would be more "correct" to call it a waveguide.

The 3.5" depth (vs. a 1" exit compression driver) is a giveaway that it's a waveguide.. the designer isn't concerned with gain but rather the specific radiation pattern of 70 by 50 down to about 3 kHz.

[mige0]

Originally Posted by ScottG

.
That unit is both a waveguide and a horn.. however it is *primarily* a waveguide, so it would be more "correct" to call it a waveguide.

Allow me to disagree...

No absorption. no dispersion due to time line tricks, plain ol' solid boundaries - its a simple horn = its a simple waveguide = its a simple diffraction alignment device ...

Will have its quarter wave honk like most horns / waveguides / diffraction alignment device ...

Some rubber to dampen dominating sonic pattern of pure metal is nice but not exactly a "revolution"


By the way, lets state clear that "waveguide" was popularized (not invented) by Earl Geddes for mere commercial reasons > sales speak, as said ..



Michael

[ScottG]

Originally Posted by mige0

Allow me to disagree...

No absorption. no dispersion due to time line tricks, plain ol' solid boundaries - its a simple horn = its a simple waveguide = its a simple diffraction alignment device ...

Will have its quarter wave honk like most horns / waveguides / diffraction alignment device ...

Some rubber to dampen dominating sonic pattern of pure metal is nice but not exactly a "revolution"


By the way, lets state clear that "waveguide" was popularized (not invented) by Earl Geddes for mere commercial reasons > sales speak, as said ..



Michael

Well then allow me to disagree with your disagreement!


Waveguide is an express conjunction composed of wave and guide. If you know the definition of wave and guide then you know the definition of waveguide.

Waveguide: to guide waves, or alter their pattern through physical limitation.

It really doesn't matter if Earl popularized it or not.. and in fact he prefers a far more limiting definition of waveguide, which is not supported by its plain meaning.

[doug20]

What waveguide is not a horn?

[mige0]

Originally Posted by ScottG

Well then allow me to disagree with your disagreement!
.

Certainly !


Even so I sadly must say that I fully agree to you last post


Michael

[mige0]

Originally Posted by doug20

What waveguide is not a horn?

so called "acoustic lenses" possibly ?


They are definitely a "guidance to waves" but not exactly what one would consider as a horn (though quite often been attached to one) - hence I excluded "no dispersion due to time line tricks"



Michael

[ScottG]

Originally Posted by doug20

What waveguide is not a horn?

One that doesn't provide any acoustic gain as it guides waves.

Even a minor felt ring around a tweeter to limit the dispersion pattern and lower cabinet edge diffraction is a "waveguide".. though a very minimal one at that.