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Old 19th April 2021, 11:06 PM   #6731
soongsc is offline soongsc  Taiwan
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The Axi2050 certainly looks interesting. Has anyone listened to these?
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Old 21st April 2021, 10:16 AM   #6732
nc535 is offline nc535
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running variations on a working ath.cfg file and got a crash -
Mesh.AngularSegments = 96 ; crashes if reduce to 48

screen capture:
Ath 4.7.0
--------------------------------------------------
Freeware version for personal non-commercial use
--------------------------------------------------

-destination directory: D:\Audio\ATH\Horns\Rect400sh
-initializing
-fixed length: 145 mm
-calculating profiles
-morphing to rectangle
-morph: adding 24 mm in width
-morph: adding 12.5 mm in height
-fixed length: 145 mm
-stretched to boundary: dx=0 dy=0
-writing ABEC project
-writing geo file bem_mesh.geo
-final mesh average throat angle: 7.000 deg
-matched wavefront radius: 104.21 mm
terminate called after throwing an instance of 'std:ut_of_range'
what(): vector::_M_range_check: __n (which is 48) >= this->size() (which is 48)

D:\Audio\ATH\Ath-4.7.0>a


.cfg file attached as txt
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File Type: txt Rect400sh.txt (2.2 KB, 6 views)
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Old 22nd April 2021, 08:19 PM   #6733
Mindsource is offline Mindsource  Canada
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60cm sand horns are almost complete, just a little more putty and sanding to go on the front roundover. Fabrication done by Jzagaja. I'll start a build thread for the complete system soon.
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File Type: jpeg EBCCBA75-638C-4F80-81F0-B1952FB40B5B (1).jpeg (487.4 KB, 266 views)
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Old 22nd April 2021, 09:23 PM   #6734
turk 182 is offline turk 182  Canada
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nice but without being able to share sound files with the masses it's all academic as to whether they are good or not...
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Old 22nd April 2021, 09:47 PM   #6735
gedlee is offline gedlee  United States
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Mindsource - they look incredibly well made. Nice job.

In mine, I brought the back of the waveguide back on a cylinder larger than the driver. This gave a huge mounting surface to a middle plate of Lexan to bolt to each mating surface. I always worried about the mounting region because it is the thinnest (in your design, not mine) and will have the most compliance, so if it oscillates then that will be the weak point. This concern may not even be worthy of consideration these days because CDs have gotten so light that it likely doesn't matter - unless the driver is heavy, then it's an issue.

but some will probably say that they sound terrible But if they are accurate then who cares.
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Old 22nd April 2021, 09:52 PM   #6736
turk 182 is offline turk 182  Canada
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would have been nice to share this knowledge back when, no?
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Old 22nd April 2021, 11:07 PM   #6737
Mindsource is offline Mindsource  Canada
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Quote:
Originally Posted by gedlee View Post
In mine, I brought the back of the waveguide back on a cylinder larger than the driver. This gave a huge mounting surface to a middle plate of Lexan to bolt to each mating surface. I always worried about the mounting region because it is the thinnest (in your design, not mine) and will have the most compliance, so if it oscillates then that will be the weak point. This concern may not even be worthy of consideration these days because CDs have gotten so light that it likely doesn't matter - unless the driver is heavy, then it's an issue.
I had this exact same thought but with a cylindrical extension of the adapter to meet the cone. Not only for rigidity (The Beyma CD14fe is nearly 7.5lbs) but for a clamp to mount to as well. Albeit, there were some twists and turns in the design and build process and I'm just glad they materialized. For one example, the price of the material we used shot through the roof before we actually got the printer going.

I'm very thankful to Jzagaja for the all the effort he put in to make this happen. He really went above and beyond.

It certainly wouldn't be outside the realm of possibility to print an additional support / adapter or to wrap some bendable material around that area and pour a cast to address both points mentioned above. We'll see if it's needed once I have them up and going.

Last edited by Mindsource; 22nd April 2021 at 11:20 PM.
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Old 23rd April 2021, 01:13 AM   #6738
Kevmoso is offline Kevmoso
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Quote:
Originally Posted by mabat View Post
To have some fun and to encourage people to actually try a free standing waveguide, I decided to release my first "serious" design of this type (was already measured here some time ago with several drivers).

It is called ST260 (ST = Small Teaser), cca ⌀260 mm x 83 mm.
Throat entry angle is 19 and should work well with majority of 1" drivers.

STEP and STL files of the ready-to-print waveguide available: https://at-horns.eu/release/ST260.zip

Have fun and give us a feedback!
How do we think this would work with a BMS 4552nd with its 24 exit? Would the 24 exit into the 19 entrance warrant a redesign on the waveguide?
I think I have my delta printer, Flsun qqs w/260mm round build area, ready to print this in one piece.
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Old 23rd April 2021, 05:46 AM   #6739
mabat is offline mabat  Czech Republic
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I have no better advice than simply to try it. There's a lot of things going on in the top octave that we don't know in advance. It could be "redesigned" quite easily for a different throat angle but not necessarily with better results. It's not that easy, that's what I've learned so far. Overall, the exact angle match itself seems not that critical as I used to think.

Quote:
Originally Posted by nc535 View Post
running variations on a working ath.cfg file and got a crash - ...
Thanks, I'll look at that.
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Old 23rd April 2021, 06:10 AM   #6740
mabat is offline mabat  Czech Republic
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Here's the STEP file for 30deg throat angle: https://at-horns.eu/ext/ST260-30.zip (259 x 81 mm)
Perhaps it could be a better match for drivers with wide exit angle.

-st260-30-png
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