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Old 4th November 2008, 05:41 AM   #1
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Default Interesting 'Labyrinth' paper

http://www.extra.research.philips.co...s/aar06pu3.pdf
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Old 4th November 2008, 06:36 AM   #2
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Thanks Pete you can never go wrong adding to the sum of human knowledge (or at least making it more accesible) without reading it in detail it looks like he's given us the science behind Fris's DALINE from "Hi-Fi News Record Review" in the '70's. At least that is what the diagrams suggest at first glance. Ta
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Old 4th November 2008, 07:38 PM   #3
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Default Some notes:

An interesting aspect of this paper is that they consider Fp can be lower than Fs.

Essentially, they use the pipe to create a hi-Q resonance and control it with a filter system (few details given though)

Their formula (5) gives a relationship for Sd which appears to contradict their claim that their method is useful in designimg Ďvery compact loudspeaker systemsí

Formula (2) might be useful if itís practical application is made clearer.

They talk about an optimum value of BL, but I canít see anywhere where they show how to find this, perhaps theyíre making assumptions that are opaque to a layman such as myself;

They have a simple formula for end correction, I think Martin King has shown that it isnít quite as simple as they think.

The ideas presented are interesting, but I suspect that too many assumptions are being made, perhaps someone with more familiarity with the maths/engineering involved can comment?
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Old 4th November 2008, 10:34 PM   #4
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Here is the original 1937 Onley paper they scooped some of the images from

http://p10hifi.net/planet10/TLS/down...inth-Olney.pdf

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Old 5th November 2008, 01:35 AM   #5
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Thanks p10, an interesting paper, although Olney's trying to achieve the opposite of the guys who wrote the paper above.
What I find interesting here is the possiblity of a TL equivalent to an EBS alignment (having a bunch of drivers that have too high an Fs ); probably not too hard to do ...???
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Old 5th November 2008, 11:09 AM   #6
sreten is offline sreten  United Kingdom
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Hi,

A paper on essentially how to make an an awful loudspeaker.

The jist is that it is high efficiency and has high output capability
at a particular frequency and the bass is bandpassed filtered to
concentrate at that frequency and further manipulated such
that its envelope follows the wider bass spectrum.

In other words high efficiency garbage, the details do not matter ....

/sreten.
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Old 6th November 2008, 04:52 AM   #7
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Dave, thanks for the Olney reference - saved me heaps of looking.

The other (AES) paper looks like something Bose will come hunting Messrs Aarts, Nieuwendijk and Ouweltjes about. Seems to be treading on Bose' area of 'expertise'...
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