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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 3rd September 2019, 08:44 PM   #11
Patrick Bateman is offline Patrick Bateman  United States
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Click the image to open in full size.

Oh, one more thing:

See that dip at 1800Hz? That's a crossover problem, not a waveguide problem. Basically that dip indicates that the midrange and the tweeter are about 45 degrees out of phase at the xover point. This can be fixed. I just didn't have time to get too obsessive about it. I spent all of twenty minutes making this crossover.
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Old 4th September 2019, 12:05 AM   #12
Sheldon is offline Sheldon  United States
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Very nice work!

Sheldon
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Old 4th September 2019, 07:08 AM   #13
pelanj is online now pelanj  Czech Republic
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Patrick Bateman, I would love to have the STL file for printing the horn adaptors for the Vifa tweeter so that I could experiment with these. Would you be so kind to share/sell the file? Thanks.
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Old 6th September 2019, 06:18 AM   #14
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by pelanj View Post
Patrick Bateman, I would love to have the STL file for printing the horn adaptors for the Vifa tweeter so that I could experiment with these. Would you be so kind to share/sell the file? Thanks.
Hi Pelanj,

I'm going to start putting my waveguides in a repo, so anyone who wants the latest version can get them.

Stay tuned.
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Old 6th September 2019, 06:19 AM   #15
Patrick Bateman is offline Patrick Bateman  United States
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Very nice work!

Sheldon
Thanks. You gotta come over and hear them!
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Old 6th September 2019, 07:08 PM   #16
Patrick Bateman is offline Patrick Bateman  United States
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I made a new revision to Metlako. It features the following improvements:

1) The main reason I did it, was because the first Metlako has a seam that runs right through the throat. I wasn't thrilled about that because the throat must be PERFECT. Metlako V2 has *two* seams not one, but both are over an inch from the throat.

2) By going with three pieces, I was able to make it wider vertically.

3) I basically made the waveguide as wide as I could get away with, while still horn loading the tweeter. It's JUST narrow enough to load the tweeter, and no more.

4) I did some fairly outlandish things to make the midbasses fit. It's crazy looking, two of the midbasses are actually *behind* the tweeter. I literally spent hours shaving off a millimeter here and a millimeter there.

Pics:

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Old 7th September 2019, 02:19 AM   #17
zobsky is offline zobsky  India
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What is the efficiency of this design?
How low does it maintain pattern control
How large / small is it ?

Apologies if I overlooked the answers elsewhere in this thread

Thanks
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"Not everything that can be counted counts, and not everything that counts can be counted." - Albert Einstein
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Old 7th September 2019, 05:25 AM   #18
kipman725 is offline kipman725  United Kingdom
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I got 1.28kHz -3dB out of FaitalPRO 3FE25 (Qes=0.8) with a very small rear chamber and front volume reducers. Without reducing the front volume the -3dB was ~100Hz lower.

My understanding is that the upper frequency limit is set by a number of factors:
Mass corner frequency
Distance of taps from horn throat (for which a compression driver adds extra length so the dome tweeter has an advantage)
Front chamber/port volume low pass filter
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Old 7th September 2019, 05:41 AM   #19
Patrick Bateman is offline Patrick Bateman  United States
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Quote:
Originally Posted by zobsky View Post
What is the efficiency of this design?
Hornresp says 92.5dB

Quote:
Originally Posted by zobsky View Post
How low does it maintain pattern control
Click the image to open in full size.

With a waveguide that's 13" in diameter, I would expect it to lose pattern control at 1038.4Hz. But based on this measurement of the Metlako v1 polars, it maintains control to 800Hz.


Quote:
Originally Posted by zobsky View Post
How large / small is it ?
The waveguide is approximately 13" x 9" x 3.5". It's literally the widest waveguide I could make that would load the tweeter down to the crossover frequency. See : The Preference for Direct Radiators

The enclosure is approximately 20" tall x 15" wide x 9" deep. That's 1.56 cubic feet. I'm using a QB5 vented enclosure maximize the power handling.

It should be good for 110dB maximum.

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Apologies if I overlooked the answers elsewhere in this thread

Thanks
No worries!
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Old 7th September 2019, 01:50 PM   #20
Sixto is offline Sixto  United States
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Hi Patrick, I'm curious about the orientation of the midbass ports, comparing the black and orange waveguides on post 1. It seems to me that you can get the slots physically closer to the tweeter and more symmetrical in the X and Y direction if they are oriented radially like the black waveguide as opposed to concentrically like the orange waveguide.

Also I wonder of the sharp edges of the slots on the orange waveguide will cause some diffraction since they are perpendicular to the direction of the tweeter sound waves.

Maybe this is all a result of the new printing configuration, or the larger midbass drivers being used?
Thanks, Sixto
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