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Old 25th November 2005, 09:11 AM   #11
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Quote:
Originally posted by Johannes LeBong it is big fun for me to show, that you can reproduce good music (really outstanding good music) with outdated audio concepts. E.g. low power tube amps based on old schematics dating back in the 1930's from e.g. Bell Labs. Vintage Fullrange speakers and so on. This is sometimes a surprise to some folks who do not know this.
I don't know that i'd call it outdated. The triode is still the most linear amplifying device we have come up with and a lot of those old full ranges will show a "modern" speaker a thing or two (i make a good part of my living selling those old drivers). It is only outdated in that the whole industry took a wrong turn with the advent of the transistor, and a lot of wonderful tech just got left behind at the fork in the road... a lot of us have gone back & are exploring the other fork.

An iPod jacked into a little SE tube amp driving a set of FRs can be a pretty musical thing (as long as what goes on the iPod is lossless. You can only throw stones at the iPod if you have no digital replay in your system.

dave
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Old 25th November 2005, 09:59 AM   #12
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Quote:
Originally posted by Johannes LeBong


@ Alex

.. in strasbourg we are quite often. My wife likes to go shopping there and we visit the theatre or the Museum Of Modern Art. I also know Lyon from business contacts.

BTW: I'm a member of another group of audio-maniacs from Paris: 'Mélaudia' (mélomanes et audiophiles associés) www.melaudia.net

Thank you for the link, I didn't know this one.
Are there some nice HiFi or DIY shops in Karlsruhe? I know 1 or 2 places in Strasbourg if you need stuff.
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Old 25th November 2005, 10:07 AM   #13
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welcome!
I know your page when it was pretty young
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Old 25th November 2005, 10:38 AM   #14
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Quote:
Originally posted by planet10
I don't know that i'd call it outdated. ...
Ok Dave,

let's say a little bit old fashioned (?) in a way.

Quote:
a lot of us have gone back & are exploring the other fork.
That's nice! And this is also the way I like to go.

BTW: I do not want to throw stones especially on the iPod (this is only one example for digital music processing/listening). But I prefer again today to listen to vinyl records with a minimalistic tube audio chain. Not only vinyl - of course

In fact I have different setups in different rooms for different types of music. I also do not believe in a 'universal speaker'.

Quote:
a lot of those old full ranges will show a "modern" speaker a thing or two
I agree with you. Maybe two years ago I discovered the so called 'Greencones' (vintage drivers extracted from old SABA-tube-radio-sets). At this point I did not believe they are something special... Now I know they are ranking amongst the very best fullrange drivers one can find.

http://www.lebong-audio.de/reso-beta/greencones.jpg

After making some experiments with these 'Greencones' and with special resonant cabinets (they work like musical instruments) I like this speakers most.

Here I have a picture of some experimental mock ups. Prototypes on the way to alter and improve my RESO-Cabinet design: http://www.lebong-audio.de/reso-beta/farm600.jpg


Best regards, Jo
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Old 25th November 2005, 11:20 AM   #15
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Quote:
Originally posted by Bricolo
Thank you for the link, I didn't know this one.
Hi Alex,

MELAUDIA has members all over France. May be also in your area (Lyon) I'll meet some of them in December at the 'European Triode Festival' in Langenargen (Germany) where they show 'une installation exemplaire' (The FRENCH System)


Quote:
Are there some nice HiFi or DIY shops in Karlsruhe? I know 1 or 2 places in Strasbourg if you need stuff.
Thank you. There is no interesting HiFi or DIY shop in Karlsruhe as far as I know.

In general, I build and collect my own things and do not care too much what is sold in a typical HiFi-Shop. We have here in Karlsruhe a small community of audiophiles and some mega-collectors. Gentlemen who own this legendary stuff from Siemens-Klangfilm (big horn installation) vintage Telefunken studio amplification, EMT turntables, Altec VOTTs, Onken, Hiraga Parts, to name a few things.

Is is a great pleasure for me to meet this getlemen from time to time.

Best Regards, Jo
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Old 25th November 2005, 06:36 PM   #16
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Quote:
Originally posted by Johannes LeBong
I agree with you. Maybe two years ago I discovered the so called 'Greencones' (vintage drivers extracted from old SABA-tube-radio-sets). At this point I did not believe they are something special... Now I know they are ranking amongst the very best fullrange drivers one can find.
Over here i run across very few of the Saba. I did have a mismatched pair of tweeters (one of which was similar to your picture) and a single oval (i have another oval, but someone doped the cone with something gross)

Over here isophons dominant in terms of availability, but my preference leans towards some of the more obscure Japanese drivers, but it still amazes me how much music can be extracted from even very budget (ie $10) vintage FRs.

From the pictures i'd guess your boxes are a variation on aperiodic loading?

dave
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Old 25th November 2005, 07:11 PM   #17
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Hi Dave,

it will be no problem, to buy greencones from eBay. You can get a stereo set for approx 100 Euro. That's very cheap! To bring the very best out of this drivers - that's the main effort! And this can make the complete speaker precious and expensive at least.

The easiest way for acceptable results with the Greencones is open baffle.

My latest design - I call it Reso|Beta - is made of thin wood. I call the technical principle 'Distributed-Port'. It is not a simple Helmholtz-Resonator tuned to one frequency. Hard to describe... it harmonizes the sound and flattens the frequency response (this was proved with a professional analyzer)

A cabinet like this cannot be calculated exactly - it is more like a matter of trial and error, experience and good luck. I'm very happy with this.


Best regards, Jo
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Old 25th November 2005, 07:39 PM   #18
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Quote:
Originally posted by Johannes LeBong
t will be no problem, to buy greencones from eBay. You can get a stereo set for approx 100 Euro. That's very cheap!
It is, but still way beyond my means at the moment... and i have no shortage of projects already in the queue.

Quote:
My latest design - I call it Reso|Beta - is made of thin wood. I call the technical principle 'Distributed-Port'. It is not a simple Helmholtz-Resonator tuned to one frequency. Hard to describe...
pictures?

dave
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Old 25th November 2005, 07:58 PM   #19
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Quote:
Originally posted by planet10
It is, but still way beyond my means at the moment... and i have no shortage of projects already in the queue.
I know this - the same over here.

Quote:
pictures?
http://www.lebong-audio.de/reso-beta/index.htm (Sorry - in German language only)

This 'musical-instrument-speaker' has two chambers of different size inside which are connected by an inner acoustically tuned port. The chambers are damped with a 'Mikrofaser' filled absorber. (I do not know the english expression - it is a kind of synthetic wool)

On the back and at the bottom the cabinet has several ports. The wood is kept under permanent tension like the wooden body of a Cello e.g.

Best regards, Jo
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Old 25th November 2005, 08:03 PM   #20
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Quote:
Originally posted by Johannes LeBong
This 'musical-instrument-speaker' has two chambers of different size inside which are connected by an inner acoustically tuned port. The chambers are damped with a 'Mikrofaser' filled absorber. (I do not know the english expression - it is a kind of synthetic wool)

On the back and at the bottom the cabinet has several ports. The wood is kept under permanent tension like the wooden body of a Cello e.g.
Are the ports damped at all... the boxes certainly are pretty. The tensioning of the wood is quite akin to how i design my boxes.

dave
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