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"Onkenhornreflex" design from Germany?
"Onkenhornreflex" design from Germany?
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Old 29th November 2019, 08:41 PM   #1
kd1yt is offline kd1yt  United States
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Join Date: Dec 2018
Location: Vermont, USA
Default "Onkenhornreflex" design from Germany?

I've been researching about Onken cabinet parameters because I am intrigued by possibly using that type enclosure for something I want to design and build--
--but it seems like the characteristics of a majority of modern speaker drivers cause the Onken calculators to specify silly-long vents.

I ran across some seemingly intriguing discussions and builds on German diy audio forums in which they've supposedly come up with a design that they're referring to as "Onkenhornreflex" and which supposedly shortens the required length of the vents.

One set of conversations:
(original German)(seems to be by (maybe) an originator of this combination of design characteristics):
Klang+Ton-Forum • Thema anzeigen - Bauanleitung Onkenhornreflex CT230 bzw. Aurum

after being fed through Google Translate:
Google Translate

A different thread with some greater detail of the design itself and of the construction techniques:

Nachbau von Kalles Aurum Hornreflex
(google-translated):
Nachbau von Kalles Aurum Hornreflex

[and a related "construction diary"]:
Kalles Aurum Hornreflex [Bautagebuch], Projekte der Nutzer / Nachbauten - HIFI-FORUM
{google translated):
https://translate.google.com/transla...-205-1054.html

The idea seems to have emerged out of discussions that began here, although I am not connecting the dots to understand how it got refined into specific formulas or measurements to apply:
https://www.diy-hifi-forum.eu/forum/...-nein-oder-was

(google translate)
https://translate.google.com/transla...ml&prev=search

Are these fellows "onto something" or is this just some sort of lucky accident that they came up with something that sounded good?
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Old 30th November 2019, 12:25 AM   #2
PeteMcK is offline PeteMcK
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Join Date: Feb 2002
Location: Western Sydney
"silly-long vents" - that's because the mouth area of the Onken vents is rather large. It seems to me that the only advantage of the Onken design is that it stiffens the side walls.
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