Free Ebook , by John L. Murphy
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, by John L. Murphy
Free Ebook , by John L. Murphy
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Product details
File Size: 10955 KB
Print Length: 224 pages
Publisher: True Audio; 2 edition (March 4, 2014)
Publication Date: March 4, 2014
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B00J7ZULIA
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Amazon Best Sellers Rank:
#132,938 Paid in Kindle Store (See Top 100 Paid in Kindle Store)
This is a wonderful reference for the beginning speaker designer, like me. There is a tremendous amount of technical information, including formulas. There is an expansive description of most every variable of speaker construction. I have found the book surprisingly easy to read even though the subject is very technical. There must be hundreds of variables to designing a simple box. One surprising aspect is how differently the designs can be for a live performance guitar player at a venue vs. a HiFi enthusiast in a home or studio vs. a car audio installation. Subwoofers are intensely described. Passive and active crossovers are throughout the book, even a chapter on designing passive crossovers. Much of the theory and a brief history of who and how these theories were developed is woven int the text. Methods of testing that cost very little or free show that the author has built many speakers. As I approach the end of the book, it is surprisingly fun to work through I was originally considering the "Loudspeaker Design Cookbook," but it would have been an overwhelming place to start. It may be the next book in my loudspeaker library, but maybe not. Introduction to Loudspeaker Design may be all the reference that someone needs.
I am not a speaker professional but I have read Small’s paper and various websites, such as www [dot] quarter-wave [dot] com by Martin J. King, and www [dot ]linkwitzlab [dot] com by Siegfried Linkwitz to study speaker design. I bought this book to see if I miss anything basic.This is a very good introduction to speaker design for who knows nothing about speaker but knows what is RLC. As the author states in the preface, speaker design is all about transforming the mysterious acoustic design into a well-studied electric circuit model. You don’t need to be a circuit designer to read this book. The author starts with basics, such as frequency and phase. However, chapter 8 requires knowledge about transfer function. Otherwise, those polynomials with “s†probably do not make much sense to you. I am also very excited that the author dedicated three pages to group delay, which is so important but mostly neglected by EE graduates now.However, I wish the author talked a little more about the mechanical side of the Thiele/Small model. Some insights are scattered in different sections, such as the compliance in the closed box design, and the speed of air flow in the tube in the vented box design. However, they are not organized together with clear language. In my understanding, a dynamic driver on its own is a mechanical mass-string second-order resonance system. The mass comes from the moving parts, including diaphragm and voice coil. The spring is mostly from the spider, which also provides mechanical damping (mechanical loss). The electrical loss is coming from the resistive loss of the wire in the voice coil. The magnet and voice coil combination also provides extra damping. Vented box is also a spring-mass system. The mass is the air in the tube and the box acts as a spring. In my point of view, the transform from mechanical resonance to electrical resonance is the greatest contribution of T/S model. Sadly, this transformation is not clear in this book.I also wish the author could talk about time-gated and near-field speaker measurements. I learned a lot how a ported box works by measuring my own speaker. The output from a dynamic driver is a high-pass filter. The output from the tube in a box is a low-pass system. When the two are tuned at the same frequency, we formed a band-pass response at the port output. Below the tuning frequency, the outputs from the diaphragm and the port are two second-order system with opposite phase and different magnitude. The sum of the two becomes a fourth-order low-pass system, as stated in Chapter 8. Measuring speaker SPL response also leads to more exciting crossover design, which can correct the deviations from the T/S model of a real driver.Lastly, I wish there is a chapter 9 telling the readers where to find information beyond topics in this book, such as cone breakup, radiation pattern, power response, horn speaker, room modes, room reverberation, psycho-acoustic effects …etc. I was amazed how the author can touch some of these topics with great insight and only a few words. For example, the discussion about the mutual coupling of drivers, and the spacing between tweeter/woofer in terms of wavelength, is the foundation to understanding power response. The cavity effect in 4.3 is also known as “room pressurizationâ€. This is very important for relative air-tight small room. It is possible for a sealed box with a high F3 to deliver really deep bass in such a room.Overall, I enjoyed reading this book and wish to find an even better 3/e in the future. I recommend this book to people new to speaker design.PS.For those who are comfortable with calculus and want to know more about the box, MJK’s transmission-line model is a terrific read. For those who are more interested in how the sound wave leaves the speaker and interacts with the room, Linkwitz’s website is a great library. There are also a lot of active crossover designs on his website.
It's definitely not Vance Dickason's Loudspeaker Design Cookbook, but it's much easier to read, containing much more practical than theoretical information. The section dealing with crossover design in particular was very practical and easy to apply.
This book strictly focuses on Enclosure design and crossovers. It has Zero content on designing an actual speaker; i.e. cone shape and material, voice coil wire sizing, suspension, magnet design etc. All the info I was after is not in this book. It should be titled "Loudspeaker enclosure and crossover design". I found the title very misleading.
Pretty good for the beginer I have not finished it yet but it seems to be teaching me a lot
I liked how they was a lot of knowledge in this book. But for the beginner i don't think this is an introduction
Excellent beginning book on speakers. Ultimately the book sells you into the true audio.com applications, which are good tools. Take this text as an introductory guide; this is only the beginning.
Really good book, about 2/3 of the way thru it.
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