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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: dam my horns image - me too ! posted by KerrB on January 8, 2005 at 21:33:52:
First, in an ideal world a plane wave tube is the correct loading for a compression driver. It is the load that most horns provide once they get large enough. However, the polar response does not come in to play since the sound is not being radiated into free space, and thus there is no acoustic equalization to raise the level of the high frequencies relative to the lower frequencies.Your measurement did not show up - your link is incorrect, I think. But that doesn't matter - go measure off axis at some different angles. You'll see it's different than what it is on-axis, and how different varies with frequency. Now get a good waveguide or conical horn or whatever you want to call it. You'll see that the response is roughly the same over a wide angle. However, the response falls at high frequencies for the reasons Tom has already explained. Since this is minimum phase, if you correct the response with any typical network whether active or passive, the phase will also be corrected. If you use a generic network that does not produce flat response, then yes, the phase will not be flat as well.
If you don't feel like measuring, here is the polar map for a 275hz tractrix horn, for example. Note how the pattern is very wide at low frequencies and very narrow at high frequencies.
Hth,
John
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Follow Ups
- Re: dam my horns image - me too ! - John Sheerin 01/8/0522:05:04 01/8/05 (1)
- Re: dam my horns image - me too ! - KerrB 12:21:03 01/9/05 (0)
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