SYDNEY LOUDSPEAKER MAFIA.......

[Τσαντουλής Βασίλης]

Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

SM: I think they need you and me to help them along. Could you describe your innovative crossover filter design, the Neville Thiele Method?


NT: I prefer to describe them as notched crossovers. They have a notch symmetrically in the high-pass and the low-pass responses, to achieve a very steep rolloff rate immediately outside the passband. Beyond the notch, the response rises again, but remains respectably low. They are especially useful when the amplitude, or more treacherously the phase, response of one or both drivers is poor outside their useful band.

 

[Τσαντουλής Βασίλης]

Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

SM: How many patents do you hold and which one do you consider to be the most significant?


NT: The attitude in Australia was that patents were not worth chasing. So I only got one when I was at EMI, on how to improve the focus of television picture tubes. When I was with ABC I got a couple of patents but they didn’t come to anything. And then of course there is the NTM crossover for WHISE Precision Audio.


SM: I have read several of your papers; however, unfortunately I have not read all 78. Are there one or more papers that stand out in your mind as landmark piece(s)?


NT: With regards to loudspeakers, the parameters in “Loudspeakers in Vented Boxes,” its successor, “Loudspeaker Enclosures and Equalizers,” “Optimum Passive Dividing Networks” (which described the Zobel network for equalizing the driver’s impedance), “The Notched Crossover,” “The Air-Cored Auto-Transformer,” and two papers on passive crossovers that take into account the impedance and the transfer function of the driver. There is another small, but I believe important, paper on “The Recovery of Amplifiers after Overload.”


Half my publications are on television, largely in the Proceedings of the IREE Australia, on linear phase IF amplifiers for TV receivers, on phase equalization, on the equalization of coaxial cable. I was quite proud of one on pulse and bar testing of television equipment that included an atlas of pulse and bar waveforms for various kinds of response errors. One on aperture equalization won a prize in 1968. [For a listing of A.N. Thiele’s published papers, go to www.audioXpress.com. —Eds.]

 

[Τσαντουλής Βασίλης]

Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

SM: Do you have any advice for new and aspiring engineers within the loudspeaker industry?


NT: Always keep your integrity, but don’t be surprised if you get clobbered for it.


SM: What is your favorite loudspeaker system?


NT: I have heard beautiful demonstrations at B&W and Meridian.


SM: What about the Quad?


NT: We did a series of subjective tests at the ABC in 1966 where the Quad came out beautifully, except it did not have the bottom end. Greg Cambrell made a large electrostatic loudspeaker at Monarch University in Melbourne and demonstrated its response to a square wave input.

It is almost impossible for a loudspeaker to reproduce a square wave but Greg’s electrostatic produced the nearest that I have ever seen.
Way back in 1946 I bought an Altec Lansing 604-B (for someone else) and thought it was marvelous. Then there were the RCA LC1As that the ABC used as studio monitors, with 15˝ drivers in 16ft3 boxes. They were wonderfully honest.

 

[Τσαντουλής Βασίλης]

Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

SM: The loudspeaker industry seems to have lagged behind other segments of the consumer electronics industry in technological advances. What do you think are the reasons for this?


NT: The loudspeaker is by now a pretty mature technology. A lot of work has already been done. Most of the work today is fine-tuning; however, I think it has a way to go yet.


SM: Other than yourself, whom do you consider to be currently conducting important research into improving sound reproduction?


NT: This must be a very selective estimate but I would say Bob Stuart, Peter Craven, and Rhonda Wilson at Meridian on loudspeakers and lossless digital coding. Then there is Graham Huon in Australia who believes that surround sound is the wrong way to go. He has been working on the perception of depth, as distinct from stereo’s equidistant panorama of sound and has done several excellent papers on it.

 

[Τσαντουλής Βασίλης]

Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

SM: What do you see as the trends in loudspeaker design and development in the next ten years?


NT: Active loudspeakers with equalization, lower crossover frequencies, and more nearly omnidirectional radiation. They may not be trends but seem to me a better way of doing things. When people ask me what has happened that’s new in loudspeakers since 1960, the main things that I think of are iron-neodymium-boron magnets and Linkwitz-Riley crossovers.


SM: Will the moving coil transducer ever become obsolete?


NT: I just cannot tell, but I think it has at least a few more years to go.


SM: Do you know when the moving coil transducer was invented? I thought it was 1944.


NT: My recollection is Rice and Kellogg in 1925, but the Germans point to Werner von Siemens in 1891 and Riegger at the Siemens lab in 1924.


SM: Will the digital transducer ever become a reality?

NT: It is possible. But years ago, I learned an important truth. If you want to know whether something can be done, ask an older engineer. If he says yes, believe him. If he says no, don’t believe him.


SM: Are you familiar with the research and development work of my colleague Dr. Wolfgang Klippel?


NT: Wolfgang is on the AES Standards Committee, AES SC-04-03, on Loudspeakers, and his thinking is the clearest of its present members. I admire enormously his work on loudspeaker nonlinearity and recently enjoyed a memorable visit with him and Uta in Dresden, Germany.


Interviewer’s note: Having met Mr. Thiele for the first time, I found him to be an amazing man and an inspiration. I have done my best to convey the accomplishments of Mr. Thiele and present an unrehearsed discussion; however, to best describe Mr. Thiele in three words is no easy task. But perhaps they would be competence, attitude, and kindness, all at the highest standards.
REFERENCE
1. Benson, J. Ernest, The Theory and Design of Loudspeaker Enclosures (available from Old Colony Sound Lab, PO Box 876, Peterborough, NH 03458, 888-924-9465, [email protected]).

 

[Τσαντουλής Βασίλης]

Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

Τα ανωτέρω είναι από εδώ:

http://www.audioxpress.com/magsdirx/voxcoil/interview-thiele105.pdf

ΥΓ. Ευχαριστώ θερμά τον RDoherty που μου το κοινοποίησε!! :cool_4:

 

[Gebreselassie]

Re: Απάντηση: SYDNEY LOUDSPEAKER MAFIA.......

Ευχαριστούμε για την ενημέρωση Βασίλη.

ΥΓ. Ευχαριστώ θερμά τον RDoherty που μου το κοινοποίησε!! :cool_4:

Το κάνει για να μην κουράζεται να τα βάζει μόνος του. Έχει και μια ηλικία όσο να 'ναι... :happy_9:

 

[ΑΝΔΡΕΑΣ Κ.]

@Βασιλη
ευχαριστουμε πολυ για την ενημερωση!

@RD
γαβ,γαβ!(private joke)

 

[Gebreselassie]

... "Γουφ! Κάι κάι κάι κάι". :cool_11: :cool_11: :cool_11:

 

[Costas Coyias]

How does it feel to be a legend...

 

[Μιχαλης Σπερτος]

Bασιλη οπως παντα .... "Θυελλωδης"
Χαιρετισμους στον μεντορα σου.