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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 11th August 2019, 01:20 PM   #1
Halair is offline Halair  Norway
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Default HalAir Aeralis - Fullrange Line Array (Vifa TC9-18-08)

My Infinite Line Source project

Brief history - I have built a line array (LA) with the same drivers in the past - Halair Column - my line array build (20 FR drivers)

My main goals this time is to improve sound quality, by increasing numbers of drivers from 20 to 24 and making a "extreme" cabinet
The outside will be conventional with a rectangular box but the driver volume will be elliptical and the "unused" volume will be filled with "epoxy granite - EG" which is simply epoxy and sand in this case.

EG is often used for machine bases (CNC) as they are easy to cast, are dimensionally stable and also act as a mass damping device. Both attributes come in handy for my intended application.
Speaker weight is estimated to about 80+kg/side.

With 24 drivers per speaker I will group them into two lines of 12 speakers each => I need 2 amps per side. My current LA is connected to a 5x125W amp
but utilize only two of them => I have 3 channels that are unused.

With a 20% cone area increase and 2x available power I expect improved system capacity + a much improved cabinet should help even further on sound quality
Fullrange LA require EQ which I dont have solids plan for yet, but it wont be my old analogue EQ I currently use.

Updates:
Attached Images
File Type: png Screen Shot 2019-08-10 at 16.16.10.png (338.4 KB, 1428 views)
File Type: png Screen Shot 2019-08-10 at 16.15.54.png (522.3 KB, 1411 views)
File Type: png Screen Shot 2019-08-10 at 16.25.17.png (628.1 KB, 1385 views)
File Type: png Screen Shot 2019-08-10 at 19.17.31.png (379.1 KB, 1335 views)

Last edited by Halair; 23rd January 2020 at 08:39 AM.
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Old 11th August 2019, 01:21 PM   #2
Halair is offline Halair  Norway
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Saved space for future updates

Last edited by Halair; 11th August 2019 at 01:24 PM.
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Old 11th August 2019, 01:25 PM   #3
xrk971 is online now xrk971  United States
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HalAir Aeralis - Fullrange Line Array (Vifa TC9-18-08)
Try casting the internal volume of the individual chambers to be a 5 sided tall pyramid. A Dagger shape as used on many of my speakers. About 1.2L is all that’s needed. They don’t support any regular resonance modes and sound transparent like an OB. Stuff them progressively with fiberglass etc dense st the rear vertex and looser towards driver cone. Leave about 1in empty space behind driver. Line walls adjacent to driver with felt or melamine foam for first 2in.
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Old 11th August 2019, 02:03 PM   #4
wesayso is offline wesayso  Netherlands
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Good to see you back in action! I like the look of that front baffle! I'll get the popcorn out for this ride. Take hour time, do it once and do it right!
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Old 11th August 2019, 03:08 PM   #5
Halair is offline Halair  Norway
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Quote:
Originally Posted by wesayso View Post
Good to see you back in action! I like the look of that front baffle! I'll get the popcorn out for this ride. Take hour time, do it once and do it right!
Well see wont we

I have machined two test baffles, primarely for testing fit & tolerances but also to see how it may be finished. Test baffle is regular 19mm MDF.
Very quick and dirty spray paint applied to raw MDF, with a proper primer/sealing and black satin...it could be quite sexy...

@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.
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Last edited by Halair; 11th August 2019 at 03:12 PM.
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Old 12th August 2019, 12:39 AM   #6
perceval is offline perceval  Taiwan
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Poor little dust caps.

Yes, I was going to mention tapering those tube enclosures down to create a cone shaped volume.

Seems you already have something working.
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Old 12th August 2019, 06:06 AM   #7
Halair is offline Halair  Norway
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Quote:
Originally Posted by perceval View Post
Poor little dust caps.
Yeah, finally got to replace the broken ones with fresh stock
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Old 13th August 2019, 08:36 AM   #8
Halair is offline Halair  Norway
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Some practical progress was made yesterday:
1 - Material for the tube tested, to see how "playable" it is regarding reshaping. Also to verify the final width when compressed from round 100mm to 84mm height (elliptical shape)

2 - preparing the cut files (CNC) for the front baffle.
Since my CNC is limited to 380mm travel along the Y-axis I need to tile the carve. The CNC is open front and back so I can feed longer material.
So the intention is a single one-piece front baffle, and the cut files are split into 3 different sections, top 4 drivers, mid 4-drivers and bottom 4 drivers.

Total carve time per baffle is approx 3hrs, I can spend less time carving but 3hrs should give me good surface finish, requiring very little pre-paint work

My original intent regarding the tubes was to glue them in place with EG, but it occured to me last night that I can slit them longside and simply use them for casting, pulling them out after the EG have cured. This will allow for more EG but more importantly - a single EG matrix per array vs 4 cells of EG per speaker. The EG wont conform easily when cast thickness approach <2mm.
Attached Images
File Type: png F360-CAM.png (171.6 KB, 424 views)
File Type: png LA-CAM.png (371.1 KB, 168 views)
File Type: jpg LA-Test.jpg (46.2 KB, 315 views)
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Old 13th August 2019, 10:09 AM   #9
wesayso is offline wesayso  Netherlands
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I'm wondering why you don't opt for a back mounted driver... as now the baffle is protruding beside the frame, not really forming an extension/wave guide shape.

It doesn't even have to be back mounted if the baffle is split up (like I did).
Have you tested the off axis performance of this shape?
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Old 13th August 2019, 11:07 AM   #10
Halair is offline Halair  Norway
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I havent really given that much thought so far, the thickness of the material is what pretty much dictated the overall "waveguide shape", no acoustic considerations have been done yet.

For my first LA I didnt do any testing prior, just built it and use them, but I will test this one, both in terms of impedance and off-axis response.

The only way I can rear-mount them would be with a similar arrangement to yours, a clamshell setup.
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