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conical horn

Posted by RCA-fan (M) on May 21, 2008 at 09:06:09

In Reply to: Love to see what it looks like graphed... posted by Ivan303 on May 20, 2008 at 11:10:17:

My 2c

Here are some tests of mouth termination.
You can see the reflections at 8kHz are actually worse with a flared mouth.
The radial conical does has a gradual transition front conical throat to 300Hz built in flare profile of the TAD 4001.
The entire vertical expansion is designed to augment this driver.
In my opinion the mouth termination issue is not solved. It is systemic within the entire shape of the horn. Just treating the mouth, (foam flares, baffles etc., is not sufficient. i am working on this problem now.

These are a few of the tests of horn flare profile/mouth shapes i have built.
I think the least amount the horn affects the magnitude response the better.
The only drawback of a conical horn is it's poor low end loading.
if you look carefully, you will see less "sub ripples" in a conical flare.

I am not saying conical horns solve all problems, but the further you get from a tube-like throat, the better.
If there were no expansion, and you had a simple organ pipe like shape- it would have a horrendous "horn" sound. It is best to avoid squeezing the throat to EQ the response as much as possible.

I hope this defends the much aligned conical horn.

Bill

PS virtually all P.A. systems use a conical horn with variois throat and mouth combinations.
Very few use the exponential. tractrix throat horn.







a pure Tractrix horn vs a Tractrix throat and a conical mouth



A conical horn with and withput a mouth fold back ( 3" radius at mouth)



A horn made in 3/4" steps, gradualty filled in with Bondo

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