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S. M. Audio Engineering utilizes and supports
some of the most powerful loudspeaker engineering tools
in the industry.
THE KLIPPEL ANALYZER SYSTEM
is a tool for development and quality control
of loudspeaker drivers and systems.
It includes a large and growing suite
of modules to measure, simulate, and investigate
the loudspeaker performance objectively
and assess the impact on the subjective listening impression.
Download Dr. Klippel's latest paper on the nonlinear parameters,
“
Loudspeaker nonlinearities - causes and symptoms”.
You can also
download a poster
that summarizes this paper's conclusions.
ARTA software
(Audio Real Time Analysis)
is an easy to use and well documented suite of programs
for audio measurements and analysis.
The
ARTA program
is a powerful analyzer for the measurement of
frequency, step, and impulse responses, waterfall
plots and sonograms, energy decay in reverberant environments,
room acoustical parameters, directivity patterns,
and speech intelligibility measures:
MTF, STI, RASTI, %AL.
The
STEPS program
enables the measurement of the frequency response
with high dynamic range and high noise immunity.
Simultaneously with a frequency response measurement,
levels of harmonic distortion are also estimated.
The
LIMP program
is for loudspeaker impedance measurements and the estimation
of the Thiele-Small linear parameters.
VECTOR FIELDS LTD.
develops simulation software
for the analysis and design of electromagnetic devices.
The OPERA-2d and OPERA-3d packages
are used by leading companies,
research laboratories,
and universities throughout the world.
We did an
advertisement
for them.
You can download
SM Audio Engineering's BH Curves
for the OPERA packages.
For a limited time we are offering indefinite licenses
to Bl(x,i).comi and Le(x,i).comi proprietary command files
and one-year free support including sample problems
to any company or individual that purchases a license
for OPERA from S. M. Audio Engineering.
LspCAD6
is loudspeaker design and modeling software
for the professional designer.
It includes box modeling
and modeling for active and passive crossovers,
and can emulate aural crossovers in real time.
LOUDSOFT
has a variety of loudspeaker simulation applications
which all utilize very user-friendly graphical user interfaces.
User up-to-speed time is typically hours, not days or weeks.
FINECone is a convenient and powerful application
for performing natural frequency FEA.
FINEMotor can be used with the users'
Electromagnetic FEA application such as VF OPERA to obtain quasi-dynamic
large signal simulations. FINEBox and FINE X-over facilitate a virtual
loudspeaker coupled with the outputs from FINEMotor and Cone. Software and
support are available from S. M. Audio Engineering.
Prices (in Euros) are available
here.
PACSYS LTD.
software applications include PAFEC-VibroAcoustics,
which can be used for the simulation
of cone/diaphragm modes (breakup),
cavity modes,
radiation/diffraction,
basket (hard-part) modes,
placement of loudspeaker/transducer,
radiation from panels and horn design,
while PAFEC-FE can be used to simulate
static stress/strain/displacement
and/or sinusoidal/transient/dynamic responses;
nonlinear large displacements,
plasticity and creep;
fully coupled acoustic analysis.
Both packages come with a pre/post processor,
and can analyze 2D and 3D problems.
PACSYS will soon release
PafLS,
a user-friendly graphic interface for the state of the art
BEM and/or FEM soft-part simulation.
Details include licensing will be made available soon.
Kindly help yourself to Steve's
Voice Coil Worksheet
for Microsoft Excel and/or our
“Common Engineering Material Properties”
and/or our
“Glossary Of Magnet Terminology”.
OPTONOR VIBROMAP 1000
is a laser based measurement system
that utilizes Electronic Speckle Pattern Interferometry
to perform vibration measurements on
cones,
diaphragms,
and loudspeaker enclosures.
This is a cost effective system
that is compact and user friendly.
This system measures what PAFEC-VibroAcoustics simulates.
Software Design Ahnert GmbH
is the developer of
EASE/EARS/AURA 4.1
and
EASERA 1.0.6.
EASE allows modeling interior rooms
and open-air spaces in 3D-representation
as well as assigning acoustic properties
to the wall and ceiling materials.
By locating sound sources in the room
or the space considered,
it is possible to compute acoustic parameters
and properties at listener seats or on audience
areas utilizing probe and mapping graphic representation.
EASERA provides audio test and measurement tools
such as MLS, TDS and dual-FFT.
The standard 48kHz EASERA is 2-channel;
EASERA PRO allows up to 32 simultaneous
I/Os at up to 192 kHz. EASERA can be used
with any mic and supports all current sound cards.
Functions and measurements include “waterfall” energy
time curves, impulse response, STI, direct and total SPL,
RMS, crest factor, distortion and more.
EASERA exports data in a variety of formats such as WAV,
EASE, TEF and MLSSA. EASERA editing features include
user-defined filters and windows, smoothing, averaging,
integrating and differentiating.
Download an
informative paper,
considered the ‘Cliff Notes’ of acoustic measurements.
Download the free EASE 2d line array design software,
SDA EASEFocus 1.32.
Download the complete
EASEFocus Manufacturers Database
as of 27 March 2006.
You need
Microsoft .NET Framework 1.1
to run EASEFocus.
RECOMMENDED ASIAN SUPPLIERS:
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A-TON
is the leading manufacturer of Voice Coil and Diaphragm Assemblies.
Please contact
Sandy.
-
Zhejiang Kaiven Magnet Company
is the leading supplier of Neodymium and SmCo Rare Earth Magnets.
Please contact
Tracy.
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KINIK Diamond Diaphragms
is the leading manufacturer of CVD Diamond Diaphragms.
Why diamond?
Please contact
Mr. Ally Chang.
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Keronite Asia,
a division of
Keronite International Ltd.
What is Keronite?
Please contact
Connie ChenLu.
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Dupont Asia Pacific
What is Hytrel 3078?
Please contact
Asian Public Affairs.
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Degussa China Limited
offers
Rohacell.
What is Rohacell XT?
What is Rohacell LS?
Please contact
Hu Pei.
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Carpenter Technology Asia Pacific Pte. Ltd.
What is Hiperco 50A (Permendur 2V)?
Please contact
Enoch Lim.
-
Bond-Laminates Asia Pacific
What is Tepex sandwich?
Please contact
asia@bond-laminates.com.
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SONIC
is a manufacturer of high performance cones and diaphragms.
Their material base includes Beryllium, Kevlar, Carbon Fiber,
Titanium Alloy, Magnesium Alloy, Granite, and Ceramic.
Please contact
Mr. Black Hung
for details.
-
DongYuan
is a low cost solution to your manufacturing
needs from within China.
Contact
May Wong
for more information.
ADDITIONAL LOUDSPEAKER PAPERS:
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“High-Efficiency Low-Bl Loudspeakers”
by R.M. Aarts.
J. Audio Eng. Soc.,
53(7):579-592, July/August 2005.
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“Direct-Radiator Loudspeaker Systems with High Bl”
by J. Vanderkooy, P.M. Boers, and R.M. Aarts.
J. Audio Eng. Soc., 51(7/8):625-634, July/August 2003.
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“Equalizing a Loudspeaker — Worked Examples”
by Neville Thiele, Professional courtesy, 24 July 2006.
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“Experimental determination of air influence
on loudspeaker cone vibrations by Scanning Laser Doppler
Vibrometry”
by
E. Esposito,
M. Navarri,
S. Papalini,
M. Pontillo,
E. P. Tomasini,
and R. Toppi.
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“Loudspeakers and Nonlinearities”
by M. Navarri, E. Bellati, F. Tordini, and R. Toppi.
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“Development of the B&W 800D”
- Bowers & Wilkins.
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“Vented-box geometry and low frequency reproduction:
the aerodynamical approach”
by Guillaume Pellerin,
Jean-Dominique Polack,
and Jean-Pierre Morkerken.
-
“Finite element methods and equivalent electrical models
for loudspeaker characterization”
by Guillaume Pellerin,
Jean-Dominique Polack,
and Jean-Pierre Morkerken.
-
“Sound source design in the very low frequency domain”
by Guillaume Pellerin,
Jean-Dominique Polack,
and Jean-Pierre Morkerken.
-
“The Development of a Forward Radiating Compression
Driver by the Application of Acoustic, Magnetic,
and Thermal Finite Element Methods”
by Mark Dodd
-
“Application of the Finite Element Method
to Model the Nonlinear Voice Coil Motion
Produced by a Loudspeaker Magnet Assembly”
by Mark Dodd.
-
“The Application of FEM to the Analysis of Loudspeaker
Motor Thermal Behavior”
by Mark Dodd.
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Several papers
by W. M. Leach Jr.
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Various papers
by Stephen Kirkup
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Publications
by Wolfgang Klippel
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“INFLUENCE OF THE PERFOMANCE PARAMETERS
IN TRANSMISSION LINE LOUDSPEAKER SYSTEM”
by Basilio Pueo, Jos Escolano, and Miguel Rom.
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Notes from Salford University's Transducer Lectures 1-10.
-
True Subwoofer whitepaper
by Bob Carver
-
JBL Pro Driver Technology Review
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Precision Measurement of Loudspeaker Parameters
by David Clark
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“An Important Aspect of Underhung Voice-Coils:
A Technical Tribute to Ray Newman”,
by D.B. Keele et al.
FRIENDS AND INDUSTRY COLLEAGUES:
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Martin J. King, www.quarter-wave.com
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Earl Geddes, www.gedlee.com
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Sigfried Linkwitz, www.linkwitzlab.com
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John L. Murphy, www.trueaudio.com
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Stephen Kirkup, www.boundary-element-method.com
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Patrick Turnmire, www.redrockacoustics.com
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Drew Daniels, www.drewdaniels.com
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Godehard Guenther, www.soundmatters.com
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Todd Beauchamp, www.in2audio-usa.com
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Peter Larsen, www.loudsoft.com
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Erno Borbley, www.borbelyaudio.com
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Kees Schouhamer Immink, www.exp-math.uni-essen.de/~immink
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Andy Canfield, www.arakka.co.th
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Wendy Carlos, www.wendycarlos.com
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Richard A. Honeycutt, www.edcsound.com
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Ken Kantor, www.aural.org
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Vance Dickason, www.ldcdiy.com/index.html
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Don Keele, www.xlrtechs.com/dbkeele.com
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Wolfgang Klippel, www.klippel.de
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Glenn Stasky, www.ncalaboratories.com
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Thilo Stompler, www.tcsounds.com
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Bob Carver, www.sunfire.com
-
Mike Klasco, www.menloscientific.com
LOUDSPEAKER CONTROL SYSTEMS AND DSP LIBRARY:
-
“APPLICATION OF KALMAN AND RLS ADAPTIVE ALGORITHMS TO NON-LINEAR LOUDSPEAKER CONTROLER PARAMETER ESTIMATION: A CASE STUDY”
by Ribeiro, Serralheiro and Piedade.
-
“Simplified Loudspeaker Distortion Compensation by DSP”
by A. Bright.
-
“Non-linear Digital Audio Processor for dedicated loudspeaker systems”
by Bellini, Cibelli, Farina and Morandi.
-
“ACTIVE COMPENSATION OF TRANSDUCER NONLINEARITIES”
by W. Klippel.
-
“Deliberate Nonlinear Design and Control of Loudspeakers”
by A. Bright.
-
“Loudspeakers: Modeling and Control”
by K. M. Al-Ali.
-
“Tuning Made Easy Using DSP”
- Velodyne white paper.
-
“Digital Drive Technology”
- Velodyne white paper.
-
“Genesis Servo-Subwoofer G-928”
- Genesis brochure
-
“Infinity's Bass Optimization System”
- White Paper on adaptive subwoofer.
-
“The Gentle Art of Room Correction”
by R. Elen.
-
“The DSP Path”
by R. Elen.
-
“Design of Digital Linear-Phase FIR Crossover Systems for Loudspeakers by the Method of Vector Space Projections”
by K. C. Haddad, H. Stark, and N. P. Galatsanos.
-
“Loudspeaker Management Systems incorporating WHISEWORKS – NTM filters”
- BSS Audio brochure.
-
“Digital Loudspeaker Arrays driven by 1-bit signals”
by N. Tatlas and J. Mourjopoulos.
-
“Trends In Digital Loudspeakers”
by Alex Salvatti.
-
“Unbiased Reconstruction of Nonlinear Distortions”
by Tams B. Bak and Tams Dabczi.
-
“Improving Loudspeaker Transient Response with Digital Signal Processing”
by David W. Gunness
-
“Compensation of Nonlinearities in Transducers”
by Martin Rune Andersen
-
“The Active Pulse Modulated Transducer”
by Karsten Nielsen & Lars Michael Fenger.
INTELELINKS:
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What is ALMA?
ALMA International
is the only international trade
association dedicated to
improving the design and manufacture
of loudspeakers.
Join today!
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The MAGNET Web,
a guide to permanent magnet design.
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The Physics Hypertextbook.
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Acoustics and Vibration Animations.
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eFunda: Engineering Mathematics.
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Support the Audio Engineering Society, AES International.
Join the AES online now.
-
Join and support the
Society of Concurrent Product Development.
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Quality Function Deployment,
QFD Institute.
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Total Quality Management
Tutorial/Help Page.
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Design for Manufacture and Assembly
by Boothroyd Dewhurst, Inc.
-
Failure Modes Effects Analysis Information Center.
-
Design of Experiments.
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General Electric's
Six Sigma website.
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Statisical Process Control (SPC).
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Electronics Calculators.
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Material Property Database.
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Engineering Unit Conversions.
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Defeating The Great China Firewall
and a
Backup Circumventor.
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You can now study at MIT at no charge, from your own computer,
thanks to
MIT OpenCourseWare.
ONLINE MAGAZINES AND PERIODICALS:
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Voice Coil
-
MultiMedia Manufacturer
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Pro Audio Asia
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Car Sound & Performance
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PC Magazine
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MIX
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Stereophile
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TNT-Audio
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AudioAsylum
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Audio Video Revolution
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Soundstage!
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Ultra High Fidelity Magazine
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The Stereo Times
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Home Theater
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Ultimate AV
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Car Audio and Electronics
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ProSoundNews
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Lighting & Sound
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Sound & Video Contactor
US PATENT SEARCH:
Search the US Patent Database
for patents granted in the past two months in the classes of 181 and 381 that have the words
"loudspeaker", "speaker", "transducer" or "diaphragm" in the title.
Search the Pre-grant US Patent Application Database
for patent applications published in the past two months
in the classes of 181 and 381 that have the words
"loudspeaker", "speaker", "transducer" or "diaphragm" in the title.
Google Patent Advanced Search
can also be used to search the USPTO database.
AlternaTIFF
may be required
to view the patent images.
AlternaTIFF is a web browser add-on (ActiveX control or plug-in) that displays most of the common types of TIFF image files. It works in most web browsers for Windows 95 or higher (98, ME, NT4, 2000, XP, etc.).
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