geezerville - 1957 Aperiodic Enclosure Article

freddi · 08:15 AM

hope all is here -

https://i.imgur.com/DCNAiCn.jpg

https://i.imgur.com/hEUYvFp.jpg

https://i.imgur.com/eMXxMGb.jpg

https://i.imgur.com/IXaCwAu.jpg

https://i.imgur.com/n7V8sfX.jpg

https://i.imgur.com/zA9pqs2.jpg

https://i.imgur.com/4bo84aX.jpg

Nikolas Ojala · 13th September 2020, 02:12 PM

Higher resolution, wouldn't that be nice?

freddi · 13th September 2020, 08:15 PM

12-250TC comes to mind for a modern driver---- might be a bit stiff --- wonder if 1/4 inch "hardware cloth" would suffice for the perforated steel sub-enclosure ?

freddi · 01:03 AM

those images are 1500p wide - - Why after a few views does Imgur not directly link them but instead shows a smaller image with "give your post at title" ?

Here they are direct. Page 15 and 16 places are swapped.

soundoutlad · 16th September 2020, 11:23 AM

Hi Freddi,
I'm constructing an aperiodic at the moment, using a 12-250tc in a simple rear vented enclosure, I might be tempted to try that 1957 version as a second project. Are you going to go for it?

freddi · 16th September 2020, 11:14 PM

With all the Karlson and horn stuff, there's no space for a new cabinet - it would be a lot of fun mucking with vent damping, impedance/response measurements and tweaking with music tracks.

With proper bracing it should be a good way to go.

Nikolas Ojala · 4th October 2020, 08:38 PM

There are some options for an aperiodic speaker, but one thing is common: They are great for current-drive. Without aperiodic it would not work very well.

Galu · 4th October 2020, 08:51 PM

Thanks for the article, freddi.

Stapling a damping sheet of, say, fibreglass directly over the rear of a driver is a well established way of lowering its Q, but Fig.11 in the article takes it an interesting stage further.

13th September 2020, 07:55 AM	#1
freddi diyAudio Member Join Date: Aug 2005	geezerville - 1957 Aperiodic Enclosure Article hope all is here - https://i.imgur.com/DCNAiCn.jpg https://i.imgur.com/hEUYvFp.jpg https://i.imgur.com/eMXxMGb.jpg https://i.imgur.com/IXaCwAu.jpg https://i.imgur.com/n7V8sfX.jpg https://i.imgur.com/zA9pqs2.jpg https://i.imgur.com/4bo84aX.jpg Last edited by freddi; 13th September 2020 at 08:15 AM.

13th September 2020, 02:12 PM	#2
Nikolas Ojala diyAudio Member Join Date: Aug 2004 Location: Finland	Higher resolution, wouldn't that be nice? __________________ High-order harmonics are more offensive than low. — D.E.L. Shorter: "The Influence of High-Order Products in Non-Linear Distortion". Electronic Engineering, April 1950.

4th October 2020, 08:38 PM	#7
Nikolas Ojala diyAudio Member Join Date: Aug 2004 Location: Finland	There are some options for an aperiodic speaker, but one thing is common: They are great for current-drive. Without aperiodic it would not work very well. __________________ High-order harmonics are more offensive than low. — D.E.L. Shorter: "The Influence of High-Order Products in Non-Linear Distortion". Electronic Engineering, April 1950.

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13th September 2020, 08:15 PM	#3
freddi diyAudio Member Join Date: Aug 2005	12-250TC comes to mind for a modern driver---- might be a bit stiff --- wonder if 1/4 inch "hardware cloth" would suffice for the perforated steel sub-enclosure ?

16th September 2020, 11:23 AM	#5
soundoutlad diyAudio Member Join Date: Jul 2019 Location: cork	Hi Freddi, I'm constructing an aperiodic at the moment, using a 12-250tc in a simple rear vented enclosure, I might be tempted to try that 1957 version as a second project. Are you going to go for it?

16th September 2020, 11:14 PM	#6
freddi diyAudio Member Join Date: Aug 2005	With all the Karlson and horn stuff, there's no space for a new cabinet - it would be a lot of fun mucking with vent damping, impedance/response measurements and tweaking with music tracks. With proper bracing it should be a good way to go.

4th October 2020, 08:51 PM	#8
Galu diyAudio Member Join Date: Apr 2018	Thanks for the article, freddi. Stapling a damping sheet of, say, fibreglass directly over the rear of a driver is a well established way of lowering its Q, but Fig.11 in the article takes it an interesting stage further.