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Multi-Way Conventional loudspeakers with crossovers

Orthoacoustic simple two way Unity corner waveguide
Orthoacoustic simple two way Unity corner waveguide
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Old 28th November 2017, 09:24 PM   #1
Circlomanen is offline Circlomanen  Sweden
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Default Orthoacoustic simple two way Unity corner waveguide

Back in the late eighties I got very interested in Stig Carlssons Orthoacoustic speakers, but the OA52.2 was way to expensive for me.

Carlsson Ortho-Acoustic Loudspeakers: Design and Performance Principles (English) - CarlssonPlanet

A friend on a Swedish forum bought a pair of old OA5 (late 60ies OA speakers) and commented on the surprising sound quality of those late 60ies loudspeakers.
I wrote a short remark about the importance of a true point source keeping the room reflections as phase-linear and tonally similar as possible in OA speakers, and I started to think about how to make a simple OA-Unity hybrid.
I wanted a simple two way speaker. A simple built, preferably only simple 90 degree cuts and square pieces.

This is what I finally built:

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It is a Faital Pro 3FE20 fullrange driver in a corner wave guide with three 4 inch alu-cone SB-Acoustics drivers in closed boxes.

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Here is two measurements taken one meter from the 3FE20. The red line is without EQ.
I need to enlarge the opening for the 3FE20. The top end response gets much better with a slightly larger opening.

I use a MiniDSP 2X4HD for crossover and EQ. The crossover is 48 dB/octave at 407 Hz (21 cm distance between the acoustic center of the 3FE20 and the 4 inch bass drivers).

It sounds really good, despite being a work in progress project.

Regards,
Johannes
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Old 28th November 2017, 09:34 PM   #2
Circlomanen is offline Circlomanen  Sweden
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Stig Carlsson had a patent on a three way OA-speaker that never got built during his life time.
I think it is easy to see that he was closing in on the Unity principle. Sadly he passed away 1996. He was one of those brilliant engineers that was way ahead of his time.

I built a crude proof of concept back in May. I worked through several throat-variations:

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And I made a lot of measurements.

My wife and kids really hate the sound of REW sweeping through the frequency range....
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Old 28th November 2017, 09:36 PM   #3
Circlomanen is offline Circlomanen  Sweden
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The three first throat geometries. I quickly found out that I needed a quite large throat for the 3FE20.
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Old 28th November 2017, 09:41 PM   #4
Circlomanen is offline Circlomanen  Sweden
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A last picture before I close of the three separate closed boxes for the bass drivers.
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Old 29th November 2017, 06:43 AM   #5
AllenB is offline AllenB  Australia
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I like this kind of project especially how it uses so little of the room volume.
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Old 29th November 2017, 07:08 AM   #6
graaf is offline graaf  Poland
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Quote:
Originally Posted by Circlomanen View Post

My wife and kids really hate the sound of REW sweeping through the frequency range....
mine got used to eventually

anyway - great project!
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Old 31st March 2019, 12:36 PM   #7
Circlomanen is offline Circlomanen  Sweden
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unityortho.png

I saw that all my posted pictures are gone, so I just want to reupload this conceptual rendered picture today. I plan on getting these speakers up and running again and I hope I can post some measurements soon.
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Old 31st March 2019, 12:46 PM   #8
Circlomanen is offline Circlomanen  Sweden
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Click the image to open in full size.

In a state of utter neglect and abandonment. Degraded to a place for me to hang my laundry.
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Old 1st April 2019, 06:40 AM   #9
celef is offline celef
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Cool project, what about the sound?
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Old 1st April 2019, 12:34 PM   #10
Circlomanen is offline Circlomanen  Sweden
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Quote:
what about the sound?
This is only a first crude proof of concept without much finesse and optimization, but they have me baffled.

This project has got me convinced that the normal freestanding rectangular box 2 or 3 way direct radiating speaker is not the way to go.

Imaging and definition is really good. At first I found myself constantly put of by the sound quality, but in very different ways from different records.... After a while it dawned on me that I was not at all prepared for this kind of revealing resolution. It was the quality of the records I was hearing, not the speakers.

A quite unnerving experience.

It is the lack of early reflections from the room and the coherent phase and tonal balance over the whole dispersal pattern that makes for a surprising level of resolution. Quite similar to listening to quality head phones or with unity-horns in free field (outdoors).
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