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  WinSpeakerz  Introduction to Loudspeaker Design DATS V3 
Measure Audio Signals Design a Loudspeaker Enclosure Learn about Loudspeaker Design Measure Z and Driver Parameters
DATS V3 Unit

TrueRTA's audio spectrum analyzer software shows you a detailed picture of what you're hearing in real-time, that is, as it happens. All you need is a Windows PC with basic sound capability. The test instruments found in TrueRTA include:

Real Time Audio Analyzer
● Low Distortion Signal Generator
● Dual Trace Oscilloscope
● dB SPL, dBu and Crest Factor Meters

WinSpeakerz is a loudspeaker simulation program. This popular speaker simulator lets you propose various speaker
systems and then evaluate them in software before you cut wood or order expensive transducer components.

● Customize your Driver Library
● Box Calculators
● Crossover Calculators
Introduction to Loudspeaker Design is written for students, technicians, engineers and hobbyists seeking an overview of the technology of loudspeakers. Topics include:

● Loudspeaker Design Tradeoffs
● Spatial Loading
● Diffraction Loss
● Cavity Effect
● Enclosure Construction
DATS measures loudspeaker parameters or passive component values in just seconds and even includes our unique impedance based Rub and Buzz test.

Measure Speaker Parameters
Perform Rub and Buzz Testing
Measure R, C and L values
Generate Audio Waveforms
Starting at $39.95 $39.95 $24.95 $129.00

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Learn more about WinSpeakerz Learn more about
Introduction to Loudspeaker Design
Learn more about DATS

 TrueRTA Audio Spectrum Analyzer for Windows
About TrueRTA TrueRTA Selection Guide TrueRTA FAQs TrueRTA Support TrueRTA Downloads

Starting at $39.95

Create your own audio measurement system starting with TrueRTA software and your Windows PC. Then add a measurement microphone and USB interface and you have a full audio/acoustic test setup. Start with the free level 1 edition which provides a 1 octave spectrum analyzer, a dual trace oscilloscope and a signal generator. Level 1 never expires. Once you get to see the power of the software and how easily you become productive with it you will want to upgrade to a higher level with greater resolution. More...

Brent Butterworth writing for Sound and Vision Magazine, Jan 2011 :
 "While lots of audio measurement software applications exist for the PC, the one that seems to have captured the hearts of engineers and enthusiasts is TrueRTA, available at trueaudio.com. Most speaker engineers I know keep a copy on their computers."

Paul writes:

As an experienced electronic musician holding degrees in music and physics I have a lot of frequency analyzers at my disposal. TrueRTA is simply the best! It is feature rich and simple to use. The display is the most readable of any analyzer I have used. I always have it running when I am working on my music or recording and processing LP records.
Kudos to the True Audio team.

Click Here to download the FREE TrueRTA Level 1
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 WinSpeakerz Loudspeaker Design Software "The Speaker Design Toolbox"
About WinSpeakerz WinSpeakerz Support WinSpeakerz_Demo WinSpeakerz Drivers


WinSpeakerz is our loudspeaker simulation program
for Windows XP, 7 and 8. Use this app to simulate the performance of any loudspeaker system you propose. Only begin building after verifying and polishing your new speaker in the simulator.

The software includes a driver database with over 1000 drivers that you can expand to include your own favorite or proprietary drivers. More...

Click here to download the WinSpeakerz Free Demo
(Windows XP, 7 and 8 compatible)

Only $39.95!


 Introduction to Loudspeaker Design, 2nd Edition by John L. Murphy


(commissions earned)

Introduction to Loudspeaker Design
is written for hobbyists, students, technicians and engineers seeking an overview of the technology of loudspeakers. Starting with a brief history of audio developments the book begins by introducing the concepts of frequency, pitch and loudness and proceeds to develop the idea of a loudspeaker as a system. 

The book is now in its second edition and covers such topics as loudspeaker design tradeoffs, spatial loading, diffraction loss, cavity effect and enclosure construction. A complete chapter is devoted to the subject of crossover design. The appendices contain technical references, design aids and a chart depicting 18 different loudspeaker enclosure types. More...

2nd Edition Chapter Headings include:

reddot.gif (829 bytes) Audio Basics
reddot.gif (829 bytes) Loudspeaker Basics
reddot.gif (829 bytes) Speaker Response Functions
reddot.gif (829 bytes) Advanced Loudspeaker Topics
reddot.gif (829 bytes) Enclosure Design

reddot.gif (829 bytes) Crossover Design
reddot.gif (829 bytes) Driver Parameter Measurement
reddot.gif (829 bytes) Loudspeaker Simulation
reddot.gif (829 bytes) References and Design Aids
reddot.gif (829 bytes) Glossaries and Box Types

Click here to learn more!


 DATS V3, the Dayton Audio Test System


DATS is an impedance measurement system with the ability to measure loudspeaker parameters in just seconds.  DATS V3 is the latest edition of the Dayton Audio Test System with a new generation of hardware. The original DATS set new standards for speed, accuracy and precision in audio impedance testing. Now DATS V3 expands and improves everything users have come to love about DATS. 

DATS was designed by John L. Murphy in collaboration with Dayton Audio.


About DATS V3

The DATS V3 Brochure

Buy DATS V3 at Parts Express

$129.00 at Parts Express


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From True Audio

Speaker Builder magazine said: "In conclusion, I cannot imagine a better "Introduction to Loudspeaker Design" than this book."  Click to read more ...

'Introduction to Loudspeaker Design"
by John L Murphy

Now in its 2nd Edition
The book for hobbyists, technicians, and engineers seeking an overview of the technology of loudspeakers.


Read the full book review
Read About ILD!
Download  our Real Time Analyzer!
TrueRTA Level 1

Download a Demo of our WinSpeakerz software and see for yourself what loudspeaker design is all about!

Get the WinSpeakerz demo and Demo Manual!
For Windows XP, Vista and Windows 7/8 - Never Expires!

Free Stuff

Murphy on Tubes vs. Solid-State

Echo, Reverb and Time Delay Effects
John Murphy's Posts on Audio Topics
Speaker Topics
Overview of  Crossovers
Overview of  Crossovers-II
Linkwitz-Riley Crossovers
Neutralizing L(e) with a Zobel
Design a Linkwitz Transform Circuit

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So, just this note to thank you for the great product.
Best, Jack"

"I find this quite an amazing package. To put this amount of test gear together in earlier days would have cost me tens of thousands of dollars. Very nicely designed, very user friendly, and tells me all I need to know in a quick and efficient way. I take my hat off to your designer !! - Arthur"

John is the designer of:

and the author of:
'Introduction to Loudspeaker Design'

About the Author


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