----- Build your last loudspeakers yourself -----

 

 

What's new

 

Concepts

Stereo Recording and Rendering

Audio production

Loudspeakers

Crossovers

Room acoustics

Issues in 
speaker design

 

 

Projects

LXmini

LX521
reference

ORION
challenge

ORION-3.4

PLUTO-2.1

WATSON-SEL

PLUTO+
subwoofer

THOR
subwoofer

PHOENIX
dipole speaker

    Dipole models

    Active filters

    Microphone

     FAQ

Three-Box active
system (1978)

Reference
earphones

Surround
sound

Loudspeaker
& Room

 

 

Assemblies

LX521

ORION

PLUTO

Do-It-Yourself

 

 

Resources

Publications

Sound recordings

Links

Other designs

My current setup

About me

Site map

 

 

Conclusions

 

 

HOME

 

--------------------
ORION
PLUTO
LX521

Users Group

 

 

--------------------
Digital Photo
Processes

 

 

What's new

 

 


From the cover of The Audio Adventure magazine, February 1996.

When Jan Didden visited in October 2010 he interviewed me about my involvement with audio before, during and after my 37 year career in R&D of Microwave and RF Test Equipment at Hewlett Packard Co. (now Agilent) in California. The interview was published in the Juli 2011 issue of AudioXpress magazine.

At AXPONA-Atlanta in 2011 I was interviewed by vimeo about ORION-4.

At the ALMA International Winter Symposium in 2014 I was honored with "The Titanium Driver Award", which recognizes a specific technical contribution, accomplishment, or expertise in the loudspeaker industry. The award was presented by Laurie Fincham (KEF, Harman Group, THX). I had written a letter to him in 1974 with questions about loudspeaker design at KEF and explained what we had observed at HP in our DIY loudspeaker design efforts. An extensive air mail correspondence, personal meetings and a lifelong friendship followed.

 

A little bit about work, fun and life ...

Work / Fun Hewlett-Packard Co., Palo Alto and Santa Rosa, California, '61-'98
(R&D Design Engineer, Project Mgr., Section Mgr., Senior Engineer)
Siemens, Zentrallabor, Muenchen, Germany, '61
Telefunken, Hannover, Germany, '57 
Major Projects / Designs 8566 Microwave Spectrum Analyzer, 100Hz - 22GHz, '78
8554 RF Spectrum Analyzer
8405 RF Vector Voltmeter
8546 EMC Analyzer
85650 Quasi-Peak Adapter
85685 RF Preselector
EMC Standards Development ANSI C63.1 
IEC/CISPR SC/A, Publication 16
'82-'00
Education Ongoing ...
Stanford University, EE, '62-'64
TH Darmstadt, Germany, Dipl. Ing. Elektrotechnik, '55-'61
Abitur, Kant Gymnasium, Bad Oeynhausen, '55
Radio Amateur License DJ1SX (diy 2-m rig), '51
Audio Fun / Work Linkwitz Lab, consulting/sharing, '99-present
Phoenix  3/2000 *** Thor  7/2001 *** Orion  9/2002 *** Pluto  4/2005 *** Pluto+ 7/2006 *** Orion++ 1/2007 *** Pluto2  5/2008 *** Orion3  7/2010 *** Orion4  4/2011 *** LX521  10/2012 *** LXmini  6/2014 ***
Audio Artistry, VP of Engineering, '94-'99
(Vivaldi, Dvorak, Beethoven, - Elite, - Grand Loudspeaker Systems)
G-Jobs with colleagues at Hewlett-Packard, '62-'94
(FM tuners, stereo decoders, pre- and power amplifiers, equalization of commercial speakers & headphones, passive crossover box speakers, active crossover box and open baffle speakers)
Fun Reading, digital photography, listening to recorded music, live music, audio design, recording, traveling, windsurfing, downhill skiing, hiking,    
Home front Born '35, Bad Oeynhausen, Germany
Father: Oeffentlich bestellter Vermessungsingenieur (surveyor); Mother: School teacher's daughter; Brother: 8 years older
WW2 and post-war Germany from a young person's perspective, '39-'48
Lutheran Confirmation (but serious doubts about religion), '49 
Married, '61 (my wife's assessment of a loudspeaker's sound and appearance is important to me)  
Working at HP in California for a 2 year cultural experience, '61
Involvement with New Age groups ('63+) and challenging R&D work at HP resulted in permanent stay in the US  
Daughter in '62; Son in '65; Granddaughters, '99, '04, '05
Spiritual search  Jesus as Teacher discussion groups - Sequoia Seminar - LSD - Creative Initiative - Beyond War - Eckhart Tolle - Adyashanti - Tony Parsons
Recent reading Daniel Kahneman - Thinking, Fast and Slow        Michael Gazzaniga - Who's in Charge?

 

B E I N G  A L I V E 

 

*******************************************************************************

 

Biography for invited talk "My Search for the Ideal Stereo Loudspeaker", 
AES 51st Conference on Loudspeakers and Headphones, Helsinki, 2013

Siegfried Linkwitz

April 2013

 

Since 1999 I have been adding information to the LINKWITZ LAB website to educate about loudspeaker design, sound reproduction and recording. I provide detailed plans for DIY construction of state-of-the-art dipole and monopole loudspeakers using active electronics. The speakers are optimized for operation in reverberant domestic spaces.

After retirement from Hewlett-Packard Co. (now Agilent) in 1998 I continued to pursue my life-long interests in audio, having designed between 1994 and 1999 a line of dipole loudspeakers with moving coil drive units for Audio Artistry. While at HP I developed the "Linkwitz Transform" circuit and earlier, in 1975, the "Linkwitz-Riley Crossover" filters out of a shared audio hobby with Russ Riley.

I worked for 37 years in Research & Development at HP, on state-of-the-art electronic test equipment, such as microwave spectrum analyzers, network analyzers and EMI receivers. I traveled, teaching HP Seminars on test and measurement in the frequency range from 10 kHz to 20 GHz. During my last 18 years at HP I also participated in national and international standards development for Electromagnetic Compatibility Test Instrumentation through ANSI and IEC/CISPR 16.

I came to the US in 1961 with my wife Eike, after having received the Diplom Ingenieur degree in Electrical Engineering from Darmstadt Technical University in Germany. I continued my education with postgraduate studies at Stanford University while working at HP in Palo Alto. We have a daughter, a son and three grandchildren.

 

******************************************************************************

 

 

 

What you hear is not the air pressure variation in itself 
but what has drawn your attention
in the two streams of superimposed air pressure variations at your eardrums

An acoustic event has dimensions of Time, Tone, Loudness and Space
Have they been recorded and rendered sensibly?

___________________________________________________________
Last revised: 10/21/2014   -  1999-2014 LINKWITZ LAB, All Rights Reserved