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Multi-Way Conventional loudspeakers with crossovers

Transmission line Omni speakers? Duevel Planets clone with transmission line?
Transmission line Omni speakers? Duevel Planets clone with transmission line?
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Old 29th January 2019, 10:06 AM   #51
scottjoplin is offline scottjoplin  Wales
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Hi. Interesting. I tend to agree, even a straight sided cone would be better than a sphere. The more directional high frequencies, will tend to be reflected back down, others will curve around a sphere and be reflected off the ceiling. You have to ask yourself, how many omnidirectional speakers out there use a sphere as the reflector?
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Old 29th January 2019, 10:27 AM   #52
DeeLuxx is offline DeeLuxx  New Zealand
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Yea i did a few measurements where the mic was about 45 degrees to the horn and i agree, it seems as though the high frequencies appear to curve around the sphere.

Will be interesting to see how the woofer/sphere combo behaves, but definitely seems less than ideal for the horn/CD.

The Duevel Enterprise speakers look like they have a more suitable reflector for the HF
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Old 29th January 2019, 01:41 PM   #53
freddi is offline freddi  United States
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Transmission line Omni speakers? Duevel Planets clone with transmission line?
1950's GA Briggs design for wideband 8"

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https://www.audioxpress.com/assets/u...drainpipe8.pdf
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Old 30th January 2019, 02:31 AM   #54
DonVK is offline DonVK  Canada
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Quote:
Originally Posted by DeeLuxx View Post
Yea i did a few measurements where the mic was about 45 degrees to the horn and i agree, it seems as though the high frequencies appear to curve around the sphere.

Will be interesting to see how the woofer/sphere combo behaves, but definitely seems less than ideal for the horn/CD.

The Duevel Enterprise speakers look like they have a more suitable reflector for the HF
Maybe a different planet is required . I was thinking about how you could try a few ideas with those spheres. All of them ruined the aesthetics of course. The horn is 25cm ID, the sphere is 14cm OD, the disc is 23cm, and the cone is 5cm ODx3cm. Compare them to just using sphere in post #21. The field at the top of the sphere is a little jagged from simulation resolution used.
Attached Images
File Type: jpg horn+sphere+modr.jpg (48.6 KB, 59 views)
File Type: jpg horn+sphere+mod@2Kr.jpg (45.8 KB, 60 views)
File Type: jpg horn+sphere+mod@3.4Kr.jpg (47.9 KB, 61 views)
File Type: jpg horn+sphere+mod@4Kr.jpg (47.8 KB, 61 views)
File Type: jpg horn+sphere+mod@7Kr.jpg (50.7 KB, 13 views)

Last edited by DonVK; 30th January 2019 at 02:33 AM. Reason: jagged
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Old 30th January 2019, 03:23 PM   #55
DonVK is offline DonVK  Canada
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..and the cone.
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File Type: jpg horn+cone_r.jpg (44.2 KB, 6 views)
File Type: jpg horn+cone@2Kr.jpg (44.0 KB, 7 views)
File Type: jpg horn+cone@3.4Kr.jpg (49.5 KB, 7 views)
File Type: jpg horn+cone@4Kr.jpg (49.5 KB, 6 views)
File Type: jpg horn+cone@7Kr.jpg (60.2 KB, 7 views)
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Old 30th January 2019, 03:30 PM   #56
scottjoplin is offline scottjoplin  Wales
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Gosh, that looks awful! What if it was twice the size, at least?
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Old 30th January 2019, 04:15 PM   #57
DonVK is offline DonVK  Canada
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It does. The problem is that it's hard to change direction unless you can provide both an inner and outer surface to support that direction change.

The sound will bounce off the walls as you can light up the room and it can even out by diffusion. You also need enough room for spacing and delays.
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Old 12th February 2019, 01:32 AM   #58
DeeLuxx is offline DeeLuxx  New Zealand
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Hi, sorry been away for a while and hadn't seen the posts.

I like the ring/sphere idea (saturn?), i'll give that a go.

Our cnc is down at the moment so might put a hold on things, but will see what i can do by hand.

Also think it might be easier just to 3D print a reflector instead.
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