- 22 May 2013
Publications - Papers to be presented at
the AES 51st and AES 52nd International Conference
- 6 May 2013
LX521 monitor - Madisound
now ships Flat Pack Cabinets
- 4 May 2013
Issues in speaker design -
Further thoughts about "Group delay and transient response"
- 19 April 2013
DSP challenge -
We have an efficient solution for LX521 stereo setups
- 13 April 2013
Audio production - San
Francisco Symphony - Channel Classics - McGill
University - Pentatone Classics - DGG
- 8 April 2013
DSP challenge - updated
- 7 April 2013
Links - Linear Audio publications and Jan
Didden's personal website
- 4 April 2013
DSP challenge - One possible
alternative to the LX521 ASP
- 29 March 2013
Links - Evaluation of Time-Frequency
Analysis Methods and their Practical Application
- 28 March 2013
Links - KLIPPEL - Online Training
- 24 March 2013
Publications - Updated links
- 23 March 2013
LX521 - Assembling Top baffle,
Woofer baffle and Bridge
- 23 March 2013
LX-521 - Designing a DSP based
- 21 March 2013
ORION-4 - Reports from AXPONA 2013 in Chicago
- 10 March 2010
Design Models - Point dipole and point monopole
in a circular baffle
- 4 March 2013
Stereo Recording and
Rendering - Recording in a virtual acoustic space
- 25 February 2013
LX521 supplies - Promotional offer for
cabinets from MagicLX521 opening its store
- 30 January 2013
Links - MUSIC TO YOUR EARS, a
most interesting article in the current issue of THE NEW YORKER
- 21 January 2013
LX521 supplies - Cabinet Kit
- 15 January 2013
LX521 monitor - Photos & Comments
about the LX521
- 10 January 2013
Digital Photo Processes - Five years
- 9 January 2013
ORION challenge - Peter Aczel of
The Audio Critic describes 'The Final Mod: Orion 3.3.1SN'
- 8 January 2013
LX521 monitor - The first pairs are
playing in Germany and USA
- 8 January 2013
Links - Dynamic Space
- 5 January 2013
Sound Recordings - I added some of my favorite music
videos to the list
- 2 January 2013
Stereo Recording and Rendering
- Subjective evaluation of phantom acoustic scenes
- December 2012
Links - How sound
waves become a listening experience
- 30 November 2012
LX521 monitor - Frequently Asked Questions - FAQ
- 19 November 2012
LX521 monitor - 'From F3 to LX521' with more detail added
- 11 November 2012
Burning Amp Fest - Jason Victor Serinus reports about
the event on the Stereophile website
- 10 November 2012
Stereo Recording and Rendering
- JJ's seminar slides about Acoustics vs. Human Hearing
- 10 November 2012
Links - The Science and Art of
- 5 November 2012
Links - First paper about swissaudec's
coding technology for spatial audio at the upcoming Tonmeistertagung 2012
- 1 November 2012
The Burning Amp Festival - an Audio Happening
- 25 October 2012
LX521 monitor - A new loudspeaker for
work and play at the highest level of sound reproduction
- 25 October 2012
Home page - A new layout
- 25 October 2012
My current setup - The
LX521 in place of ORION-3.3
- 25 October 2012
Site map - Updated
- 25 October 2012
Convention in San Francisco - On Friday, October 26th, at 2:30 pm in
Session P6, I will give a paper "A Model for Rendering Stereo Signals in the
ITD-Range of Hearing". Presentation
- 25 October 2012
Burning Amp Festival
2012 - Sunday, October 28th. I will bring the new LX521 monitor. Directions to 2nd floor of Building C.
DIYaudio Clubs & Events.
- 14 September 2012
ORION Reviews - Dutch articles about ORION
construction, its performance and an interview with SL.
- 3 September 2012
Recording & Rendering -
Making a SACD with the Budapest Festival Orchestra
- 28 August 2012
Recording & Rendering - 101
- Can be downloaded as a PDF file
- 21 August 2012
Recording & Rendering - 101 - A
comprehensive presentation of the issues and problems involved with
recording an acoustic event and creating an aural scene on reproduction over two loudspeakers in a reverberant environment.
- 19 August 2012
PLUTO Supplies - Assembled and tested
electronic modules can now be ordered again
Issues in speaker design - Phase shift due
to dipole D and its effect upon crossovers (Corrected)
- 4 August 2012
ORION & PLUTO
by Wood Artistry - Explore the new website
- 2 August 2012
Publications - Watch the recently posted
YouTube video of my 2010 Burning Amp Festival presentation: "What Are
the On-axis and Off-axis Frequency Response Requirements for Stereo
Loudspeakers?" recorded by Linear Systems.
A broadband, constant directivity requirement is no longer a question in my
- 16 July 2012
Links - Auro 3D - Principles in Surround
Recordings with Height
- 17 May 2012
ORION - What is involved in building
- 16 May 2012
Publications - A Model for
Rendering Stereo Signals in the ITD-Range of Hearing
- 6 May 2012
Links - DAC noise shaping, jitter and
digital volume control
- 24 April 2012
ORION-4 - An update about building the speakers
yourself from a kit
- 14 March 2012
WATSON-SEL - The important
direct-to-reverberant sound ratio
- 2 March 2012
AXPONA in Jacksonville, FL,
- March 9-12 - ORION-4 by Wood Artistry will be demonstrated in Room
- 26 February 2012
WATSON-SEL - An update of its
design and operation
- 9 February 2012
Links - Subjective assessment of audio quality - The means and methods
within the EBU
- 6 February 2012
WATSON SEL - Stereo Enhancement Loudspeaker
- 16 January 2012
Links - Less and More - The Design
Ethos of Dieter Rams
- 13 January 2012
- Stereo in 2-D
- 4 December 2011
ORION-4 - Video interview from AXPONA-Atlanta,
- 20 November 2011
Reference earphones - An update
- 8 November 2011
PLUTO supplies - A new printed circuit
board with hole spacing for readily available components
- 4 November 2011
Links - Testing One, Two,
- 2 November 2011
DIY and the Cost of Doing
- 20 October 2011
ORION-3 - Version 3.5 of the ORION, which uses
new SEAS woofers in a W-frame configuration, has been
designed and documented. It can be a skilled DIY retrofit to the ORION-3.3.
- 17 October 2011
& Conditions - How can you pass on what I sell?
- 3 October 2011
ORION-3 - Version 3.4 of the ORION, which uses
new SEAS woofers has been
designed and documented. The woofers fit into the ORION-3.3 woofer
H-frame with a minor DIY change.
- 2 October 2011
ORION-3.4 (= ORION-3.3 with new SEAS
10" woofer drivers) had its first showing at the 5th Burning Amp Festival in San Francisco.
High Definition source material was played from a digital memory drive using
L1000 Music File Player. - - This was, as always, a fun event.
- 2 September 2011
Wood Artistry/Linkwitz Lab will demo an ORION-4 at the Rocky Mountain
Audio Fest, 14-16 October, 2011, in room 400.
- 17 August 2011
I have heard that access to www.linkwitzlab.com
is blocked for some viewers in Italy, France, Netherlands and UK. My ISP
cannot resolve the problem. If you are affected try one of the solutions
- 10 August 2011
ORION Support - New printed circuit boards are
available for the ORION ASP
Links - Suppliers of high resolution
ORION-Reviews - The Audio Critic about
ORION-3.3 and ORION-4
Toneburst CD - Download Track 1 for a
boom and rattle test of your loudspeaker and room combination
About me - An interview in AudioXpress magazine,
My current setup - My current audio and video
ORION-Reviews - AXPONA NYC
report in Stereophile
Links - HDtracks.com - Downloads of
high definition music files
Links - Listen - A classical music magazine
Links - Introduction to 3-D Audio
In a few days we will demo ORION-4 in NYC.
Come to the Wood Artistry &
Linkwitz Lab room #725 to listen and talk to Don Naples and myself.
Links - Listening in on the brain
Links - The Well-Tempered Computer
Links - Dipole Bass vs Monopole Bass
ORION challenge - ORION-3.3 DIY
ORION challenge - ORION-4 from Wood Artistry
Music - Several recordings have been added to the list
||ORION-4 by Wood Artistry/Linkwitz
Lab was shown at AXPONA
The price for the loudspeakers with standard woods and finishes and
including the Analog Signal Processor (ASP) is $14,750 FOB
The Introductory Price - valid through June 31, 2011 - is $13,750.
First shipments are expected in July, 2011.
Add-on options are offered for custom 8-conductor speaker cables
with Speakon connectors and for sets of interconnect cables.
Amplifier suggestions include Marantz MM8003, ATI AT1806,
and Bryston 9B SST (2x).
A Marantz SA-7S1 SACD/CD player and Pass
Laboratories XP-10 preamplifier with remote controls were used for
See front and back sides of the handout page
for product and stereo features and Stereophile's show report.
ORION-4 will be shown at AXPONA New York City,
June 24-25, 2011.
Links - Linear Audio - Volume 1.
AXPONA - Wood Artistry
LLC will exhibit ORION-4.
variation of the ORION loudspeaker design employs
custom 10" woofers from Seas
in a W-frame configuration
and a new cabinet
for enhanced low frequency and
Left: ORION-4 Prototype 2 under test
I will be in Atlanta to support Don
into the consumer market.
Artistry will follow up with a DIY version of the cabinet.
A retrofit of ORION-3.2.1 with the new 10" drivers in the
existing H-frame is planned for later this year when I have
an ORION-4 in my living room for comparison tests.
Issues in speaker design - Crossover
topology issues (details added)
Links - The Inaudible
Links - Orion Gateway
Links - Polar response
calculations for Open Baffle Dipoles
Links - Mikrofonaufnahmetechnik und Tonstudiotechnik
Publications - and more than just
ORION-Revision 3 - Don
Barringer summarizes the revisions of the ORION loudspeaker since its inception
Reviews - Peter Aczel of The Audio Critic
webzine reviews Version 3.2.1 of the ORION open-baffle loudspeaker
Publications - I gave a paper 'Hearing spatial detail in stereo
recordings' in the
session on 'Perception & Esthetics' of the 26th TONMEISTERTAGUNG in
Leipzig, Germany. The talk was then followed by one and a half days of auditory illustrations of
different recording styles using PLUTO-2.1 in a large office room, which caused astonishment and delight
for many Tonmeister, Professors and Students.
Joerg Wuttke, of Schoeps Microfone design fame, was
instrumental in bringing my loudspeaker and room ideas to the attention of
Guenther Theile from the Organizing Committee of TMT26 and for the
opportunity to demonstrate what I would talk about. Marius ter Ellen brought
his Pluto loudspeakers from the Netherlands to make this possible.
Left photos: SL explains constant directivity and room response
Center: Marius in the far back; Clemens Par who stunned everyone by
his unique signal processing algorithm for turning mono into stereo with
individual instrument placement; SL looking for a business card; Joerg
Wuttke; Guenther Theile and Florian Camerer, who is responsible for the
Vienna New Year's Concert ORF broadcast.
Right: Malgorzata Albinska-Frank; Joerg Wuttke.
My thanks to all who made this a successful presentation, especially to
Guenther Theile and Peter Maier for last minute help in toning down a highly
reverberant empty room. We carried in heavy felt curtains and foam bulk absorbers
from a concept-A
truck to create an acoustically dead end to the room.
- Wood Artistry's new website for all things ORION and PLUTO
The Burning Amp Festival - Wood Artistry will demo
ORION-3.2 and I will give a talk:
"What Are the On-axis and Off-axis Frequency Response Requirements
for Stereo Loudspeakers?"
presentation and Talk with Q&A (1:29 hrs, 21 MB, mp3) - Afterthoughts
I got promoted!
Last demo of the
day (Shostakovich, Symphony #15)
I have become inundated with emails. Paid order fulfillment is definitely my
priority. Please read the updated Caution:
The content of
these pages may change without notice as I learn new things or find better
descriptions. The designs presented here may change as I make new observations
or gain more insight. I see myself as a seeker of truth, though I now know that
every person is, and ultimately truth is a construct. There is only this. Maybe what
has been done here points you to it. Audio has overwhelmingly been a hobby for
me, for my own pleasure and love of music. I enjoy to share what I found and
possibly to dispel a few misconceptions. My interest is not on the business side,
though I like that my activities pay for my hobbies. You may not agree with some
or all aspects of my designs, the approach that I take to them, or the theories.
I have no problem with that. Just do not ask me "what would happen if
...". Changes that you make to the designs are for your own pleasure and at
your own risk. But if you learn something worthwhile, then please let me know. I
have received increasing amounts of email. I have responded to every legitimate
letter that made its way through the Junk Mail, even when it meant repeating what has
been published. My DIY projects are not for beginners and it may be necessary
for you to buy subassemblies or a turnkey system from Wood Artistry. Please do
not ask me for individual help with your DIY difficulties. All my designs have
a Support Page. It is listed on the cover of your project documentation. There is an ORION/PLUTO Users Group with people who can help you. I respond to every
email eventually, but you may not get the answer you want. I
consider my writings in these web pages as brief and to the point. I labor over
every sentence and word and provide little redundancy. Read thoroughly and maybe
more than once. I do not write for the rank beginner, but for those who have
been around the block. You may need to study up. The links in my text are for
that. I have not been standing still
since I started this web in 1999 and with the idea of a brain dump of my previous
findings so they would not get lost to the audio community, and with the PHOENIX
as an example, so you could test my findings for yourself. In 2006, I thought I would go
into a support and maintenance mode. No new design. Stuff happened, more
enjoyment to share. Just do not ask me about the timing or performance of future
products or if there will be any. I feel free to change things, always keep the
upgrade path in mind, but I am not bound by that should I find something
significant. I could stop now and be content with what has been
2010 Rocky Mountain
Audio Fest - One page Handout
for ORION System
in Room 414 at RMAF and a new Price list
Three-box active system (1978) - Added SPL
Nomographs and Mailbox letters from out-of-print Speaker Builder magazine
2010 Rocky Mountain
Audio Fest - Linkwitz Lab, Wood Artistry and Seas will demo ORION-3.2 in
Links - Some factors
in loudspeaker quality (1976, Harwood, BBC R&D)
ORION-3.2 - A new loudspeaker with a proud
Linear Audio - A
new semi-annual publication. I contributed a 22 page article with 22
illustrations to the first issue of
Issues in speaker design - L-07 Dipole
Issues in speaker design - High -frequency
down-shelving for ORION-3
Issues in speaker design - What is the optimum polar response for a loudspeaker?
ORION-3 - Revision 3 of the ORION loudspeakers
PLUTO+ subwoofer - New closed-box1.xls
spreadsheet with driver data base
Links - Vector Waveform
Links - Acoustics Handbook
- Horbach-Keele linear-phase digital crossover filters (updated)
ORION Challenge - Words from a satisfied
Processes - A pocketable companion for my LX3
Links - Putting the Science
back into Loudspeakers
Publications - STEREO - From live to
recorded and reproduced - What does it take?
Links - Constant beamwidth transducer
Other designs - Controlled
directivity loudspeaker designs
Issues in speaker design - Accuracy,
spatial distortion and plausibility of the auditory scene - Conclusions
Links - Microphones and
Issues in speaker design - Triggered burst
measurements of tweeters
PLUTO omni speaker
- The assembled and tested electronics module is available again
Links - The physics
and psychoacoustics of surround recording
Links - Multichannel
natural music recording based on psychoacoustic principles
Links - Perceptual
differences between wavefield synthesis and stereophony
Links - A Case for
- The Seductive (Yet Destructive) Appeal of Loud Music
Issues in speaker design - Spatial distortion
Accurate Stereo - Accurate
performance of a stereo sound system
Active filters - Room EQ
Toneburst CD - Pink
Noise Imaging Test
Publications - Slides of two talks at
the 7º Conferencia AES Chile, November 2009
of loudspeakers - Burning Amp Festival, October 2009
Sound reproduction - The best sound
Crossovers - The best crossovers ...
Loudspeakers - The best loudspeakers ...
Room acoustics - The best rooms ...
Publications - Slide presentation and
soundtrack from "The challenge to find the
optimum radiation pattern and placement of stereo loudspeakers in a room for
the creation of phantom sources and simultaneous masking of real sources"
- AES New York, October 2009
Manuscripts from "Recording
and reproduction over two loudspeakers as heard live" - AES Munich, May 2009
Publications - "Electrical, mechanical
and acoustic filters in the design of a loudspeaker with dipole
Publications - "Investigation
of sound quality differences between monopolar and dipolar woofers in small
Publications - "Development
of a compact dipole loudspeaker", 1992
Links - Audio Musings by
Links - Enjoy the Music - Review
Digital Photo Processes - LX3
Issues in speaker design - Crossover topology mistakes
Links - A sensibly
designed loudspeaker, the GRIMM AUDIO LS1
Publications - Recording
and reproduction over two loudspeakers as heard live - AES Munich, May 2009
Links - Review of the Audio Artistry
VIVALDI open-baffle loudspeaker from 1996
PLUTO supplies - Assembled, tested, and
ready to play PLUTO-2.1 Electronics Modules are available again.
Active Filters - Passive versions of filters 5, 6, and
a fixed attenuator 10
ORION FAQ - When do I need THOR
PLUTO-2.1 - The latest update of PLUTO
Links - The
Links - Monte Kay's Home
Links - Horbach-Keele
Digital Photo Processes - Waiting is over!
The compact LX3 camera
Pluto-2 - A
loudspeaker review by Peter Aczel of The Audio Critic
FAQ 20 - What contributes to the polar response of ORION+?
Design of loudspeakers - AES
Convention, RMAF, Burning Amp
Design of loudspeakers - First
correspondence between SL and Laurie Fincham from KEF
Publications - "Phantom images in
2-channel audio playback versus natural hearing processes"
Pluto-2 owners check your Support Page for the latest update.
Audio Fest - First public demonstrations of the ORION+ and Pluto-2.
Burning Amp Festival - I will give a talk about "The path to
increased realism in 2-channel audio playback and recording"
Links - Floyd Toole: Sound
Reproduction - Loudspeakers and Rooms
PLUTO-2 - Tweeter
Recording for stereo - Stereo
Recording for stereo - Mapping
from recording to playback
Pluto-3 - A 3-way speaker with
external crossover/equalizer and power amplifiers for someone who likes to
test their skills.
Pluto-2 - Construction details
for conversion from PLUTO to Pluto-2 and to Pluto-2+
ORION++ - Rear tweeter level
Pluto-2 - A number of revisions to the
original PLUTO for an easier to build and extended bass output 2-way system.
Publication #24 - "Accurate sound reproduction from two loudspeakers in a
San Francisco AES Section Meeting. Presentation slides.
Added Reference  for further reading about Investigation
of energy storage.
Added Tracks 19-28 to the Toneburst CD
Added web page about Recording for
See the AES Convention paper
which underlies the Room optimized
stereophonic reproduction web page.
The first open baffle
Audio CD with demonstrations of Auditory
H-frame loudspeaker from before
Review of the ORION++ by The
A student version of CircuitMaker circuit
analysis software is still available for download.
Software signal generator for
PLUTO owners check their support site for the Seas L16RN-SL circuit changes.
Summarizing statement added to the Home page.
A little homage to special friends: Russ Riley,
Lyman Miller, Brian
Added an Analog to digital conversion
page to Digital Photo Processes.
Added a Sharpness page to my camera
Added photos from my Audio Artistry era to the Links
I added an addendum to Suggestions and
I am posting the Digital Photo Processes pages. This will
highlight my limited bandwidth issues and probably force me into a more
costly hosting plan. But then there is always the Website
A 1999 paper by B. Moore that deals with "Controversies and mysteries in spatial
hearing" came to my attention again. I had
forgotten about it. It would have helped me to understand the reason for the
surprising similarity between an omni and a dipole in a reverberant room
It is likely that the website will be down on the 21st day of each month due
to heavy traffic, but it will always resume on the 22nd when my 50 GB/mo
bandwidth allowance period starts up again.
I added the "cocktail party effect" to the paragraph about "Sound
stream segregation" on the "Recording for stereo" page.
Some readers were apparently confused about what Don is trying to
In case you wondered why the website was shut down yesterday for several
hours, I had reached my monthly bandwidth allowance of 50 Gigabyte. Today
starts a new monthly pay period with my ISP.
If you own the Website CD, then you have access
to 99% of the information here at all times and you probably will not notice
any future interruption.
The UK Chapter of the Audio Engineering Society keeps a full record of
monthly talks on its
website. The great variety of audio related subjects is educational and
I receive about 300 email messages per day. 98% of that is junk and I just
pull out those that have a relevant subject line. So be clear with the
subject if you want to get through my Spam filter. Before writing please
read my CAUTION.
User Group is a good place to ask questions, get help and make contact.
It also applies to PLUTO.
If you are thinking of designing a box loudspeaker, then read Loudspeaker
System Design. It covers many fundamental issues.
A reminder to those who have bought documentation from LINKWITZ LAB. On the
cover is the URL for a support page. Check it for the latest updates.
My recent talk in London gives a summary of what has been learned here about
loudspeaker design for accurate sound reproduction in relatively small
rooms. ORION+ and PLUTO+ embody the key features that a loudspeaker must
have. I hope that these prototypes will stimulate eventually some new
loudspeaker developments for the high-end audio market so that a wider
audience can hear what a simple 2-channel sound system is capable of. I am
not holding my breath, though. The industry, its marketers and commentators
are firmly locked into vented boxes and no fresh air comes in. Besides, the
profit in this business is in cables, spikes, room tuning, etc. and now
compact speakers for the iPod generation, but their hearing might be already
The first and last links in the left hand column should let you find quickly
what is new on the website by pointing to this page. This new page also gives me a convenient place to add