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Multi-Way Conventional loudspeakers with crossovers

New Celestion "AxiPeriodic Driver"
New Celestion "AxiPeriodic Driver"
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Old 7th December 2018, 03:10 PM   #131
kipman725 is offline kipman725  United Kingdom
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Quote:
Originally Posted by Ro808 View Post
In other words, these guys made wave fronts visible!
Is that the fabled HOM I see in the horn plot?
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Old 7th December 2018, 04:11 PM   #132
Ro808 is online now Ro808  Netherlands
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Those would be the ripples in the plots (on the left) below.
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File Type: gif page4.gif (182.8 KB, 128 views)
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Old 7th December 2018, 05:07 PM   #133
Ro808 is online now Ro808  Netherlands
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Here's the SB-10 Whitepaper.
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Old 7th December 2018, 06:33 PM   #134
Ro808 is online now Ro808  Netherlands
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Finally, some images of Technics' SB drivers.
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File Type: jpg SB Woofer.jpg (341.1 KB, 48 views)
File Type: png SB Mid.png (873.0 KB, 45 views)
File Type: png SB Tweeter.png (686.7 KB, 45 views)
File Type: png Leaf Tweeter.png (439.3 KB, 43 views)
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Old 7th December 2018, 06:44 PM   #135
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by kipman725 View Post
Is that the fabled HOM I see in the horn plot?
Keep in mind, HOMs can be very easily visualized in the Hornresp wavefront simulator.

I find it interesting that such a simple simulator achieves results that are surprisingly similar to BEM tools like axidriver and ABEC, but the Hornresp results are *animated*, which really helps me figure out what the issue is. This is particularly handy for phase plugs.

I guess if we had thirty two core CPUs and gigabytes of ram, it might be practical to use software that does animated BEM sims. My laptop is a quad core Ryzen and it still takes about two minutes to run an Axidriver sim.
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Old 7th December 2018, 07:06 PM   #136
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the latest ryzen does have 32 cores!
AMD's wild 32-core Ryzen Threadripper chip goes on sale
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Old 7th December 2018, 07:33 PM   #137
Ro808 is online now Ro808  Netherlands
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Most laptops - with the exception of a few high end HP's - are insufficient to run professional FEM/BEM software.
A workstation with dual XEON 2695V4, a couple of Tesla GPUs + 192GB RAM will run most audio related sims pretty much real-time.
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Old 7th December 2018, 07:44 PM   #138
Patrick Bateman is offline Patrick Bateman  United States
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But ABEC and Axidriver don't use GPUs

Which really sucks; this type of software is ideal for that.

It is kinda funny that the Celestion BEM simulations of this driver, featured in the Youtube video, aren't a whole lot different than Hornresp simulations like this:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

from here : Cloning a $3200 Speaker for $400

Animations created with Hornresp wavefront simulator and Image Magick
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Old 8th December 2018, 02:52 AM   #139
Ro808 is online now Ro808  Netherlands
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These wavefront sims can be misleading (see attachment).

I know GP Acoustics' subsidiaries utilise high-end software including Siemens PLM.

ABEC and Axidriver are very powerful tools. Hard to beat in terms of price/performance,
but obviously limited compared to Ansys, Comsol, Siemens etc.
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File Type: png FEM Analysis of Dual Diaphragm Compression Driver.png (421.2 KB, 29 views)

Last edited by Ro808; 8th December 2018 at 03:07 AM.
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