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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 16th November 2019, 09:39 AM   #111
wesayso is offline wesayso  Netherlands
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Looking good! Did it turn out like you planned?
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Old 16th November 2019, 10:35 AM   #112
Halair is online now Halair  Norway
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Yeah, its pretty decent - there are a few holes in thin internal thin walls of the EG, areas where I didnt manage to compact it good enough (or too much too fast) but those are easy to seal.

Here is an informal "tap test" between mk1 and mk2, mk1 is all sealed up and stuffed, mk2 is open on both ends.

You can hear the "tap" is higher in pitch and not as loud.
Video: Mk1 and Mk2 tap test
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Old 17th November 2019, 02:24 PM   #113
Halair is online now Halair  Norway
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Just minor progress over the weekend, I have filled the interal wall holes that were present due to insufficient packing of the EG-matrix.

Plans for the coming week:
  1. Cast the chamber rear wall - aka an "EG-puck" for each chamber
  2. In this puck there will be a straw where the speaker wires can pass through
  3. Prepare the felt and start lining the chamber walls
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Old 17th November 2019, 10:22 PM   #114
Halair is online now Halair  Norway
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Small job but a prerequisite for the next one, closing up the chambers. Scheduled for tomorrow
Will need approx 5kg for of EG to seal this deal (..pun intended..)
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Last edited by Halair; 17th November 2019 at 10:24 PM.
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Old 17th November 2019, 11:38 PM   #115
wesayso is offline wesayso  Netherlands
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Only now do I understand what you posted one post up...
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Old 18th November 2019, 06:42 AM   #116
Halair is online now Halair  Norway
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"A single image is worth a 1000 words..."

The stages I am currently at dont give much visual update, it just looks like the cabinet thats been done for a while now (just heavier,much heavier..)
Hence not much imagery posted...

So plans for today is to make the final cast of EG on the first cabinet, sealing of the rear wall. Then I will quickly start lining the chambers and install all the wiring
If all goes well this first speaker might produce sound this weekend...

Then I can start lining up and casting the 2nd cabinet
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Old 19th November 2019, 10:15 PM   #117
Halair is online now Halair  Norway
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All those minor steps...

Speaker wire glued in, felt is prepared to be installed over the next few days
Then the drivers will be installed and the stuffing will be sorted out while I resume work on the 2nd cabinet
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Old 22nd November 2019, 08:39 AM   #118
Halair is online now Halair  Norway
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I have a group of 3-4 chambers that sound "hollow" when I tap their back wall (EG puck). It appear that the plate used to line the rear openings, have bent away a few mm for some reason, allowing more of the EG-mass to flow out/up against the side walls. This leave less EG-mass for thickness and apparently didnt seat it fully.

For the time being I will not do anything about this but will see on the impedance sweeps if further action is required. The fix should be straight forward, simply hammer the weak ones out and re-cast. Will investigate.

All chambers are now lined with felt and filled with 10g each with stuffing.
So next job is to temporarely mount the drivers and hook it the first line up
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Old 22nd November 2019, 09:20 AM   #119
TNT is offline TNT  Sweden
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I think you are on to something with these cabinets. But maybe you should have made them with a roundover - at least on the front. Diffraction is a bi**h.

This way is definitely inspiration for my next build. Think I will try the new SB 3". Maybe skip the glue and go all in fiber concrete...

//
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Last edited by TNT; 22nd November 2019 at 09:22 AM.
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Old 22nd November 2019, 10:22 AM   #120
Halair is online now Halair  Norway
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Quote:
Originally Posted by TNT View Post
But maybe you should have made them with a roundover - at least on the front. Diffraction is a bi**h.
You mean like this? (see pic, front baffle top with bevelled and rounded edges)

Thank you for the kind words, I hope my project will be worth it i

One note against concrete - it never stop to cure and it will shrink during this process. Fiber reinforcement or aggregate will reduce this.
Its said that concrete shrink about 12mm over a 9m span and it dont take much to split/release from a weak surface.
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File Type: jpg LS2019-Pair2.jpg (574.1 KB, 179 views)

Last edited by Halair; 22nd November 2019 at 10:37 AM.
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