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Onkens - Benefits? Design Considerations?
Onkens - Benefits? Design Considerations?
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Old 6th December 2017, 05:39 PM   #11
kevinkr is offline kevinkr  United States
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Onkens - Benefits? Design Considerations?
The Onken design is based on the old Jensen Ultraflex.

I built a pair of Onken bass boxes more than a decade ago, they are the only part of the system that has not been replaced in that time.

I continue to be happy with their performance but have made some changes since built. (basically just the materials used for internal damping which are surprisingly critical - lambs wool or wool based carpet underlayment work better than more modern materials)
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Old 6th December 2017, 09:59 PM   #12
Scottmoose is offline Scottmoose  United Kingdom
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Sort of. As I understand it:

-Thuras invented & patented the bass reflex (which is different to Novak, and latterly Thiele, then Small's, vented box) in 1934. Jensen created the Ultraflex variation on the theme a couple of decades later. These boxes use their huge (by typical current standards) vent systems to target maximum acoustic efficiency at Fb.

-Post Novak, Thiele, and some of Small's work, the Onken is created. It is a specific variation on the 'modern' vented box theme, hybridising the massive vent structure of classic reflex design (and exploiting the convinient Ultraflex layout) with the ducted vent & specific filter based alignments using Q, Fs and Vas to determine box volume and Fb. As a result, Onkens share some characteristics with classic BR design (lots of vent area) with regular vented boxes. Because of the massive vent area, the ducts are, in general, relatively long, and as a result their 1/2 wave resonant modes tends to create midband colouration.

-Dave Dlugos's enclosures physically resemble Onkens & the Ultraflex but are functionally different, as he deliberately uses a high vent aspect ratio & the resistance / friction generated to push the box alignment toward / into a quasi-aperiodic function. This is significantly different to the Onken, where tuning is basically similar (albeit with vent harmonic resonance & with particular tuning goals) to a conventional T/S vented box, and almost the polar opposite to the classic BR & the Ultraflex.
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Old 6th December 2017, 10:15 PM   #13
planet10 is offline planet10  Canada
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Onkens - Benefits? Design Considerations?
Quote:
Originally Posted by GM View Post
It was in this French article among others
Here is Hiraga’s article, Google translated into English and pdfed.

http://www.planet10-hifi.com/downloa...ns-english.pdf

dave
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Old 6th December 2017, 10:36 PM   #14
Henderson is offline Henderson
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I used to hear an Onken W ! You need the room for this serious punchy bass... Need also drives with Fs lower than 30 Hz (Altecs were around 25/30 Hz, much harder to find today ! Think the big Tannoys get the both of the two worlds :energy and plexus upercut in the upper bass from the Vott and lows extension of the Onken... and clean low mid : Onkens are not only subs but a very good low mid made for XO around 700 Hz and horn above)
Iir: onken were liked in Japan because havin the low-end lacked in the Vott... !
BR you see today in the Stereophile class A are poor toys for kids vs a serious Onken W, imho !

Last edited by Henderson; 6th December 2017 at 10:51 PM.
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Old 6th December 2017, 10:37 PM   #15
soendervig is offline soendervig  Switzerland
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Default Erh , regarding that translation ...

You just got to love french . Last sentence of the translation . While "enceinte" indeed does mean pregnant , and therefore is translated quite correctly , whenever the same term is used around audio , it ought to be translated with "enclosure" . Try figure...

Cheers

Kim
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Old 6th December 2017, 10:41 PM   #16
soendervig is offline soendervig  Switzerland
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Default PS.

Just saw that it was a google translation . Explains a lot ; expecting them to know the difference is probably asking too much....

Cheers

Kim
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Old 6th December 2017, 11:07 PM   #17
planet10 is offline planet10  Canada
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Onkens - Benefits? Design Considerations?
If i had software to edit text in a pdf (i might be able to import it into something and then re-eport it) i’d have the inclination to go in and clean it up a bit.

dave
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Old 6th December 2017, 11:13 PM   #18
Henderson is offline Henderson
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craftsmanship : Réalisation du caisson Onken 360 litres (P.Viboud)
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Old 6th December 2017, 11:13 PM   #19
soendervig is offline soendervig  Switzerland
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Yes , but then it's nice with a chuckle once in a while
Come to think of it , perhaps it was the old B+W DM 6 that caused the french confusion in the first place.....

Good night ,

cheers

Kim
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Old 6th December 2017, 11:42 PM   #20
planet10 is offline planet10  Canada
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Onkens - Benefits? Design Considerations?
Quote:
Originally Posted by Henderson View Post
craftsmanship
You want to see craftmenship you should see some of Bernie’s solid wood miniOnkens (a reminder, as i stated, and Scott emphasized, not an Onken). truly artpieces and some while not as large as in the article you posted, still big — monster miniOnken (this is not near the biggest built to date — those are some 3+ x the volume).

Click the image to open in full size.

dave
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