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HalAir Aeralis - Fullrange Line Array (Vifa TC9-18-08)
HalAir Aeralis - Fullrange Line Array (Vifa TC9-18-08)
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Old 13th August 2019, 12:20 PM   #11
wesayso is online now wesayso  Netherlands
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It is the option of that CNC of yours that could make it interesting to experiment some .
I know my back mount isn't optimized but do wonder what it would do. A simple test with a single driver could shed some light here. I just copied a shape/size from a published test by a German forum user that showed real promise.
I liked the radius on the outer edge, but wonder if a shallow wave guide shape would help off axis performance.
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Old 13th August 2019, 12:45 PM   #12
Halair is offline Halair  Norway
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Originally Posted by wesayso View Post
A simple test with a single driver could shed some light here. I just copied a shape/size from a published test by a German forum user that showed real promise.
I liked the radius on the outer edge, but wonder if a shallow wave guide shape would help off axis performance.
I can easily design a two-part front baffle for the test rig, a thin baffle the Vifa is rear-mounted and a outer curved wave guide that snap on top. By doing so I can change wave guide designs without altering the speaker/box... Not sure I should curse you or praise you for giving me more "thinkload"
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Old 13th August 2019, 01:55 PM   #13
wesayso is online now wesayso  Netherlands
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Sorry about that!
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Old 13th August 2019, 04:39 PM   #14
xrk971 is offline xrk971  United States
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HalAir Aeralis - Fullrange Line Array (Vifa TC9-18-08)
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@XRK971 - thanks for the idea Not sure I fancy creating 48x 5-sided pyramids though! I do have a concept I consider regarding internal diffusing + stuffing.
Oh, I was under the impression that the rear cabinet was going to be molded/cast from synthetic granite - so thought you could stick a 5-sided form in them while being cast for a quick rear chamber. But if not, I agree its too much work.
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Old 13th August 2019, 07:18 PM   #15
Halair is offline Halair  Norway
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You got my idea right the first time, but creating the 48 forms seem to be a little daunting at the moment
Perhaps CNC-machine a positive snail shape and make a vacuum form??

Perhaps for MKIII
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Old 13th August 2019, 10:40 PM   #16
Halair is offline Halair  Norway
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Not a lot of playtime today but made a forming jig for the chamber molds and a mock-up of the diffusor plate.
The diffusor will be CNCd out of 6mm plasterboard and lined with foam/felt.
Main purpose is to break up the rear wall reflection by diffusing/dispersing the timing of the waves.

Also traced the actual and final shape of the chamber form so I could do the length calculations.
So while not much to show for, I think I have got on to a good headstart - considering this is intended to be a winter project

I now have enough to finish my test chamber
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Old 14th August 2019, 01:33 PM   #17
perceval is offline perceval  Taiwan
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That's a Karlson aperture inside the enclosure? Interesting.
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Old 14th August 2019, 03:58 PM   #18
Halair is offline Halair  Norway
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That's a Karlson aperture inside the enclosure? Interesting.
Yes it is, main intention is to break up the rear wall reflections by diffusion
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Old 14th August 2019, 06:40 PM   #19
perceval is offline perceval  Taiwan
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Click the image to open in full size.
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Old 14th August 2019, 10:30 PM   #20
Halair is offline Halair  Norway
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It is

Construction of test chamber complete, casting epoxy / sand during the weekend Then impedance sweeps can be made to finalize stuffing ratio in front of/rear of diffusor plate.
The longside slit in the plastic tube is to help prying it out after the EG matrix have cured. So the test cabinet will also be used to verify method of construction..! Rather fail to pull this one out vs the 24 next ones!!
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