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HF horn dimentions and low end cut-off [message #43902]

Tue, 10 February 2004 13:22

Chris R
Messages: 133
Registered: May 2009

Master

Hi Wayne,

For the 4-Pi's I'm going to start shortly, I ended up getting
Selenium 25-25 horns. Similar to the ones you recommend in dimensions, etc. While trying to pick a horn, I noticed that
similar sized horns were rated for pretty dis-similar cut-off, and
at the same time, some rather smaller horns were rated for what
seemed like pretty low cut-off. Aren't those specs pretty much
dictated by physical dimentions related to the size of the sound
waves? Any explanation for the spec games?

BTW, the Selenium horns are nicely finished, heavy dead aluminum,
with a nice wide rim (as opposed to some complaints I've seen about
one or the other 1" horn you specify). I'll post more once I get
things hooked up.

thx, Chris

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Re: HF horn dimentions and low end cut-off [message #43906 is a reply to message #43902]

Tue, 10 February 2004 15:59

Wayne Parham
Messages: 18791
Registered: January 2001

Illuminati (33rd Degree)

The performance of an HF horn at low frequencies is very dependent on the space it is used in. Actually, all horns are for that matter. An HF horn that is baffle mounted will generally have smoother response than freespace in the octave above its lower cutoff, particularly if the horn is physically small. And beyond that, the shape of the horn has an impact on its performance at frequency extremes. The throat is most important up high and the mouth is more important down low. So there is some room for interpretation, and particularly in the first octave.

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Re: HF horn dimentions and low end cut-off [message #43907 is a reply to message #43906]

Tue, 10 February 2004 18:23

Chris R
Messages: 133
Registered: May 2009

Master

Thanks,

About the baffle mounting, is this similar to the extention wings
I've seen on some huge Altec (A-4's???) theater speakers for
improving bass response.

Chris

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