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Multi-Way Conventional loudspeakers with crossovers

Metlako: A Small, Affordable Two-Way Unity Waveguide
Metlako: A Small, Affordable Two-Way Unity Waveguide
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Old 7th September 2019, 08:23 PM   #21
Patrick Bateman is offline Patrick Bateman  United States
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Experimentally, I have found that the best performing midrange taps are taps that expand. The way that I get away with an expanding midrange tap is that it begins as a circle and ends up as a slit.

Click the image to open in full size.
For instance, the entrance of this midrange tap measures 1" in diameter and it's circular. That's an area of 5.07cm^2. The exit of the midrange tap measures 4" x 1/2", for an area of 12.9cm^2.

Click the image to open in full size.
Here's the measured polar response of the midrange array in Metlako V1

Click the image to open in full size.
Here's the predicted response from Hornresp, which can only simulate a conventional (straight) midrange tap. (1)

Click the image to open in full size.
Here's the predicted response from Akabak for a straight (conventional) midrange tap (red) and an expanding midrange tap (black)



Here is what I see from the sims and the measurements:
  • I believe the measured and simulated results show that the expanding taps are superior to straight taps
  • I think that some additional work on the Akabak model could be useful. For instance, the Akabak sim doesn't "catch" the null that exists at 1800Hz.


(1) if there's a way to simulate the expanding taps in Hornresp, let me know.
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Old 8th September 2019, 12:08 AM   #22
Patrick Bateman is offline Patrick Bateman  United States
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I've created a GIT repo for my waveguides.

The latest version of Metlako can be downloaded here:

GitHub - crater-lake/metlako: a two way Unity waveguide

If you have a git client installed, you can get the repo like this:

johndoe@DESKTOP-FA5T5QS MINGW64 ~/Downloads/work
$ git clone https://github.com/crater-lake/metlako.git
Cloning into 'metlako'...
remote: Enumerating objects: 9, done.
remote: Counting objects: 100% (9/9), done.
remote: Compressing objects: 100% (7/7), done.
remote: Total 9 (delta 0), reused 6 (delta 0), pack-reused 0
Unpacking objects: 100% (9/9), done.


What I'd like to do is keep these online, so whenever someone is looking for the latest version, they can pull them down from git. Another nice thing about git is that I can include instructions on how to print them and build the speaker. That's the next step.

Last edited by Patrick Bateman; 8th September 2019 at 12:11 AM.
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Old 8th September 2019, 06:55 AM   #23
Patrick Bateman is offline Patrick Bateman  United States
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Here's a video of Metlako V2 playing some tunes :

YouTube
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Old 8th September 2019, 10:09 AM   #24
pelanj is offline pelanj  Czech Republic
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That is great, thank you very much for sharing!
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Old 8th September 2019, 05:25 PM   #25
Finnito123 is offline Finnito123
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Thank you for sharing your development processes. What drivers are you using? Would be interested to build one myself
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Old 9th September 2019, 04:48 AM   #26
Patrick Bateman is offline Patrick Bateman  United States
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lol, thought I'd listed them!

Here's the parts:

1) 2 x waveguides for a stereo pair. Get waveguides here : GitHub - crater-lake/metlako: a two way Unity waveguide

2) 1 x MiniDSP. $95, get here : miniDSP in a BOX : miniDSP 2x4

3) 4 x MCM 55-1870 midbasses. $40.68 for four, get here : https://www.newark.com/mcm-audio-sel...one/dp/39C2182

4) 1 x Tymphany NE19VTS-04. $23.10, get here : Peerless by Tymphany NE19VTS-04 3/4" Silk Dome Tweeter

Also available from Madisound.

I think the Dayton DA135 might work as a replacement for the MCM. The Dayton is 3mm too big, so if someone went this route they'd have to grind down the mounting plate to make it fit. The MCM would definitely be easier and cheaper.
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Old 9th September 2019, 05:41 AM   #27
ScottG is offline ScottG  United States
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Quote:
Originally Posted by Patrick Bateman View Post

Click the image to open in full size.
Here's the predicted response from Akabak for a straight (conventional) midrange tap (red) and an expanding midrange tap (black)
-is that the new beta version?
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perspective is everything
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Old 9th September 2019, 02:53 PM   #28
454Casull is offline 454Casull  Canada
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Great work!

Marked for later.
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Old 9th September 2019, 02:54 PM   #29
454Casull is offline 454Casull  Canada
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What would you recommend for bass reinforcement in a nearfield setup?
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Old 10th September 2019, 07:47 AM   #30
bourbon-neat is offline bourbon-neat  United States
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Metlako: A Small, Affordable Two-Way Unity Waveguide
Thanks for sharing your work and 3D printing files. If you were to buy a 3D printer now, for this type of project,
what would you buy?
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