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Old 9th July 2013, 05:55 PM   #1
Hava is offline Hava  Iran
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Default best beyma woofer for Onken?

I want to build a pr of Onken cabinets and I have access to Beyma products. I wan't opinions on which models are good. higher eff. is preferred
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Old 9th July 2013, 07:17 PM   #2
GM is offline GM  United States
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This alignment ideally wants a high efficiency driver by design, so target high Vas drivers to try in a simulator.

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Old 9th July 2013, 07:35 PM   #3
Scott L is offline Scott L  United States
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My choice would be the 15LX60. That's only my opinion, but that's what you asked for.
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Old 9th July 2013, 07:58 PM   #4
koja is offline koja  Canada
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Default choice of driver for Onken

I have gone through that exercise a while back.

I read the Thuras patent on which Onkens were based and read the French articles for all three sizes of Onken. acquired and double checked an excel based calculator for dialing in T-S parameters of the driver and calculating the enclosure sizes (still have it somewhere).

Well i have to tell you that this design is a VERY specific solution to obtaining a good sound. as i remember it calls for a driver with a large Vas and low Qts, and even then the original driver used was modified by the author. such drivers are not made nowdays at all. i ran the calculation for a number of available drivers (Beymas included) and could not find any to meet the requirement for maximum port length.

so now you know. Good luck.
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Old 9th July 2013, 08:47 PM   #5
Scott L is offline Scott L  United States
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Default Altec maybe ?

A Large Vas and low Qts sounds like an Altec 416-8B.
And you are correct; not made anymore.
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Old 9th July 2013, 09:56 PM   #6
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A guy I new once had a pair of Onken-Focal speakers that used Focal 10C02 woofers in an Onken enclosure. If I'm not mistaking they had high Vas and very low Qts. Such drivers are not easy to find anymore, that's true.

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Old 9th July 2013, 10:09 PM   #7
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Quote:
Originally Posted by koja View Post
I read the Thuras patent on which Onkens were based and read the French articles for all three sizes of Onken.
By looking at it from a glance the Onken looks like a regular bass-reflex cabinet with slot ports on the sides.... so can you share with us the "secret" of the Onken ?

I do remember that the Onken-Focal's I heard had very tight bass, so probably they had some qualities.
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Old 9th July 2013, 10:18 PM   #8
scholl is offline scholl  United States
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One of the SM115N or Ks might be a good match.
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Old 9th July 2013, 10:47 PM   #9
sjs is offline sjs  United Kingdom
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I got one of the classic French articles translated back in the 90s and then reverse engineered the various designs. They are all a v specific alignment of a ported box which wholly rely upon the correct driver parameters which are almost never available in modern bass drivers. At the time I found one Focal unit, the 10C01 I think, which just about worked and built some cabs which I still have.
I built them to work with SE triode amps but realised they dont. They all need a v low series resistance from the amp output, and any choke in the crossover, and this needed to be included within the calcs fir the alignment. With an SS amp in a multiamp system they can be great.
Best of luck
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Old 9th July 2013, 11:03 PM   #10
GM is offline GM  United States
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Quote:
Originally Posted by Scott L View Post
A Large Vas and low Qts sounds like an Altec 416-8B.
And you are correct; not made anymore.
GPA is now making them to order for folks with 'deep pockets', so most folks just buy the 416-8C ferrite motor version.

Some of the GPA 515 series works well also when driven with a high output impedance. Ditto the 604 series duplex.

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