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Old 10th June 2015, 05:04 PM   #1
crissty is offline crissty  Greenland
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Default Directivity of Mid

I all, can anyone help as to how would be the directivity and freq response (low and high cutoffs) of this type of design for Midrange purpose (say can it be useful from 100 hz to 1000hz).

Showing one side, wanna use hf in middle and two of mid speakers.

As i dont know much on directvity . reflection, frequency for this type of horn or can it be simulated in hornresp.

Thanks.
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Old 10th June 2015, 10:39 PM   #2
ScottG is offline ScottG  United States
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The wavelengths are too long for such a small "waveguide", it probably won't effect the dispersion of the driver much below 800 Hz.


This is the program you'll need to model it:

ABEC3



..first time I've seen someone posting from Greenland, cool.
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Old 17th June 2015, 01:48 PM   #3
crissty is offline crissty  Greenland
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After tweeking long hours day after day on offset driver, this is the sim i could get in Hornresponse.

Shows good response upto 800hz in 4Pi, maybe the limit to 800hz would be due to 12" driver, and maybe i could use a phase plug to extend it to 1500 or 2000hz, any suggestions.
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Old 17th June 2015, 11:57 PM   #4
AllenB is offline AllenB  Australia
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I didn't get that from your drawing. What actually is it? Is it meant to be a short horn against a wall. with an offset driver? What is its role?
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Old 18th June 2015, 04:13 AM   #5
crissty is offline crissty  Greenland
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I have been trying to simulate this paricular model as OD in hornresp for getting a smaller footprint of midtops, but am no sure of the coverage pattern for his paricular design, and have an extetion as horn, as shown above.

Thanks,
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Old 18th June 2015, 04:18 AM   #6
crissty is offline crissty  Greenland
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Old 18th June 2015, 04:32 AM   #7
AllenB is offline AllenB  Australia
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Hmm, looks like slot loading. The cavity could promote the acoustic cancellation of higher frequencies. Too short to be called a horn really. Horns are poor performers when intentionally shortened. Doesn't mean there's a problem if they were meant to be that way though.
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Old 18th June 2015, 03:37 PM   #8
crissty is offline crissty  Greenland
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Yes, so my main goal is to have a smaller footprint of Midtop, so extending this same with a short horn, all i am concerned about the directivity, should it catear to atleast 90deg horizontally, verticall no issues as 10-15 may b fine.

So any suggestions...

Also guide me as to what design issues / benifits would arise of this shown pic (sorry m not quite good at drawings) for Mid section like Loading, Phase cancellations, and does this loading increase throat pressure or cancell upper frequencies or some other issues..???
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Old 19th June 2015, 03:41 AM   #9
crissty is offline crissty  Greenland
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Quote:
Originally Posted by crissty View Post
pls guide me as to what design issues / benefits would arise of this shown pic for Mid section, like Loading Phase cancellations, and does this loading increase throat pressure or cancell upper frequencies or some other issues..???
hey any masters there willing to guide...
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Old 19th June 2015, 06:14 AM   #10
AllenB is offline AllenB  Australia
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Sorry, I have some questions. What is your preferred frequency range? If you have driver loading there are a few things to watch out for. Waveguiding would still work but if you want to take it to 2000Hz you should watch where you put it. These things complicate what you can get away with, for example corner loading makes the job easier but sometimes bandwidth gets in the way.
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