Something wicked this way comes... (2020 speaker teaser content)

ddk

Industry Expert
May 19, 2013
4,780
1,477
585
Utah
#61
Very interesting! I had never seen anything quite like it before, the closest being the "vanes" in something like the TAD TH-4001, which (if I understand correctly) are there to manage the horn's cross-sectional area so that the expansion rate is exponential. But maybe they do other things (such as help with high frequency dispersion) as well.

My impression of Bill Woods, horn designer for Oswalds Mill, is that he's a very smart guy with a lot of tricks up his sleeve. I bet he has found work-arounds for any audibly significant issues, and I bet that little speaker sounds magnificent.

But he's not the ONLY guy doing a small speaker with a round (though not "conical") wooden horn!
Here's a 4 way 70's studio speaker with phase plugs on the woofers, they used them on woofers for a couple reasons I believe in this case it was to minimize higher frequency interference when the drivers are close as is the listening distance.

grundig_hifi_box_2500a_3-way_loudspeaker_system.jpg

There are also dome type plug/lens that were common place in home audio.

RMUdsI.jpeg

and lets not forget good old pa speakers with phase plugs :D!

36H458_AS01.jpeg

david
 
Likes: Duke LeJeune

Folsom

VIP/Donor
Oct 26, 2015
4,988
825
270
Eastern WA
#62
I doubt the 70’s monitors have anything to do with being a phase plug. You can see their FR on the box. They might be excursion limiters, but that is hard to believe. Maybe simply weird grills.
 

ddk

Industry Expert
May 19, 2013
4,780
1,477
585
Utah
#63
I doubt the 70’s monitors have anything to do with being a phase plug. You can see their FR on the box. They might be excursion limiters, but that is hard to believe. Maybe simply weird grills.
I have those speakers they're not excursion limiters or simple decorative covers. Siemens used similar type round lenses on their full range theater speakers. Phase plugs are very common here's vintage Onkyo speakers.

O1CN011eo1qsNsil7yESQ_!!188233917.jpg

6ac9f3d56c2f2f0a9c9f5af3694c69be.jpg
6e4c52a64f9e3768f73e0355c22bcb3c.jpg
 

DaveC

Industry Expert
Nov 16, 2014
3,126
1,027
390
#64
Actually, every single driver in my speaker uses a phase plug... :)

In compression drivers like the tweeter below they also serve to narrow the throat, in the dynamic drivers they prevent high frequency interference, it sounds a little weird without them.






 

ddk

Industry Expert
May 19, 2013
4,780
1,477
585
Utah
#65
Actually, every single driver in my speaker uses a phase plug... :)

In compression drivers like the tweeter below they also serve to narrow the throat, in the dynamic drivers they prevent high frequency interference, it sounds a little weird without them.






They’re everywhere!
 

DaveC

Industry Expert
Nov 16, 2014
3,126
1,027
390
#66
This is a recent Paradigm speaker with a "phase plug", maybe lens is a better term...

 

Folsom

VIP/Donor
Oct 26, 2015
4,988
825
270
Eastern WA
#68
I have those speakers they're not excursion limiters or simple decorative covers. Siemens used similar type round lenses on their full range theater speakers. Phase plugs are very common here's vintage Onkyo speakers.

View attachment 67702

View attachment 67703
View attachment 67704
Your other examples make sense because they apply to the mid band and they are larger.

In those cases they can even out power response. In the first case I sincerely doubt they could do anything at all unless the speakers naturally ring at s high frequency that is a harmonic of everything else played - even then makes little sense.
 
Last edited:

morricab

Well-Known Member
Apr 25, 2014
4,382
994
358
Switzerland
#69
Very interesting! I had never seen anything quite like it before, the closest being the "vanes" in something like the TAD TH-4001, which (if I understand correctly) are there to manage the horn's cross-sectional area so that the expansion rate is exponential. But maybe they do other things (such as help with high frequency dispersion) as well.

My impression of Bill Woods, horn designer for Oswalds Mill, is that he's a very smart guy with a lot of tricks up his sleeve. I bet he has found work-arounds for any audibly significant issues, and I bet that little speaker sounds magnificent.

But he's not the ONLY guy doing a small speaker with a round (though not "conical") wooden horn!

View attachment 67695
Odeon Orfeo was another small speaker with a wooden horn.
 
Likes: Duke LeJeune

About us

  • What’s Best Forum is THE forum for high-end audio, product reviews, advice and sharing experiences on the best of everything else. A place where audiophiles and audio companies discuss existing and new audio products, music servers, music streamers and computer audio, digital to audio converters, turntables, phono stages, cartridges, reel to reel, speakers, headphones, tube amplifiers and solid state amplification. Founded in 2010 What's Best Forum invites intelligent and courteous people of all interests and backgrounds to describe and discuss the best of everything. From beginners to life-long hobbyists to industry professionals we enjoy learning about new things and meeting new people and participating in spirited debates.

Quick Navigation

User Menu

Steve Williams
Site Founder | Site Owner | Administrator
Ron Resnick
Site Co-Owner | Administrator
Julian (The Fixer)
Website Build | Marketing Managersing