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Old 6th September 2012, 10:12 PM   #1
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Default Horn adapters

Hi guys ... thought I'd try here, too! I am going to a homemade large format horn for my midrange. The horn has a 2" throat.
Will this adapter P AUDIO_PC5038 cause any problems using my 1.4" Altec 288 drivers? If necessary I can turn a thin wooden plate for the 1.4" to 1.5" conversion.
Thanks, Zene
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Old 7th September 2012, 12:33 AM   #2
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Originally Posted by Zene Gillette View Post
Hi guys ... thought I'd try here, too! I am going to a homemade large format horn for my midrange. The horn has a 2" throat.
Will this adapter P AUDIO_PC5038 cause any problems using my 1.4" Altec 288 drivers? If necessary I can turn a thin wooden plate for the 1.4" to 1.5" conversion.
Thanks, Zene
horn throat to driver exit diameter and slope (tangent angle). Discontinuties at the horn/driver joint should be avoided even if implemented by use of an adapter.

Regards,

WHG
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Old 7th September 2012, 09:13 AM   #3
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WHG ... Between you and Asylum if I don't do it right I'll be sorry. So I will.
Thanks, Zene
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Old 7th September 2012, 10:55 AM   #4
djn is offline djn  United States
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I had a pair of 350hz edgarhorns that where designed for a 2" compression driver. I used that adaptor to make use of my Altec 288C 1.4" compression driver. I did not find any issues at all. We measusred them in a semi anaquic chamber and the responce was very smooth.
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Old 7th September 2012, 06:58 PM   #5
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Originally Posted by djn View Post
I had a pair of 350hz edgarhorns that where designed for a 2" compression driver. I used that adaptor to make use of my Altec 288C 1.4" compression driver. I did not find any issues at all. We measusred them in a semi anaquic chamber and the responce was very smooth.
Then the slopes and diameters at both joints are a sufficient match.

WHG
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Old 8th September 2012, 02:15 AM   #6
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Getting a little confused. Unless the horn is custom made to a specific driver the angle of the driver throat is rarely the same as the horn throat. That doesn't justify adding another angle from an adapter, but I think it does bring up a question or twenty. The mfgs must have a good reason for unloading the throat of a driver with a conical flare.
Zene
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Old 8th September 2012, 03:23 AM   #7
winslow is offline winslow  United States
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The first few inches of all horn flares are all pretty much the same
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Old 8th September 2012, 06:40 AM   #8
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Winslow ... then are you saying most horn throats, if they are close to 90 deg at the start, except for conical, are all a mismatch to the driver and inherently wrong? Tractrix does open fairly quickly, but it take an exact flare rate to closely match a particular driver.
Zene
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Old 8th September 2012, 02:54 PM   #9
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Originally Posted by Zene Gillette View Post
Getting a little confused. Unless the horn is custom made to a specific driver the angle of the driver throat is rarely the same as the horn throat. That doesn't justify adding another angle from an adapter, but I think it does bring up a question or twenty. The mfgs must have a good reason for unloading the throat of a driver with a conical flare.
Zene
The driver bore, if conical, approximates a flare with an initially very large radius of curvature.

Within the driver bore and horn as well, an impedance transformation process is taking place. Unloading occurs only when signal frequency approaches horn cut-off or the horn is not present.

The reason for an adapter is cost, but all adapters are not created equal. The one you want to use is the one that has diameters and slopes that match those of the driver and horn attached.

Note there are also adapters that implement boundary transitions (round to rectangular) and wave front spreading (for pattern control). Use of these devices in an audiophile setting is contraindicated.

Regards,

WHG
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Old 8th September 2012, 02:55 PM   #10
djn is offline djn  United States
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Originally Posted by whgeiger View Post
Then the slopes and diameters at both joints are a sufficient match.

WHG
Yes, they were a good match up. And sounded good as well.
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