Voice Coil 2011 08.pdf

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VOLUME 24, ISSUE 10

AUGUST 2011

®

In ThIs Issue

sPOTLIGhT

A Message from Ed Dell

InDusTRY neWs

AnD DeVeLOPMenTs

By Vance Dickason

InDusTRY WATCh

By Vance Dickason

ACOusTIC PATenTs

By James Croft

1

New D-fend for

Loudspeakers, p. 10

4

12

18

Motor Ring Dome

Tweeter, p. 21

21

TesT BenCh

SB Acoustics and Parts Express

Home Audio Applications

By Vance Dickason

Products & Services Index

30

Spotlight

plans and enthusiasm the Elektor group is bringing to our

enterprise.

One of the privileges I will miss the most is my ongoing

relationship with the more than 900 authors who have

made our publications possible. Of these, more than a

third is from countries outside of the United States. From

the beginning, more than 40 years ago, authors have

offered us outstanding fare. Just recently, I received a new

manuscript from our star performer, Nelson Pass. I take

this as a good omen that the quality of these periodicals

will continue.

I am pleased to report that Vance Dickason, whose tal-

ents have been a very significant factor in our success, will

continue as editor of Voice Coil . We are all working hard in

this transition hoping that all will go smoothly. We ask for

your patience during this period.

Please accept my thanks for the pleasure of being pub-

lisher for an audience who have responded in all sorts of

wonderful ways over our years together.

A Message from Ed Dell

Dear Friends,

Audio Amateur, Inc. is in a wonderful transition. All of

our assets will have been acquired by the Elektor group by

the time you read this. The Elektor group publishes Circuit

Cellar magazine and the North American version of Elektor

magazine. This ensures a more firm, well-funded publish-

ing organization behind our periodical and book publish-

ing activities. The buyers have major plans to strengthen

and expand audioXpress, Voice Coil , our two annuals— The

Loudspeaker Industry Sourcebook and The World Tube

Directory— and our list of books and CDs.

On a personal note, some of you know that I founded

the company in 1970 and that we are now in our 41 st year

of operation. Birthdays pile up.

Next February, I will be 89. I am in fine health and still

active. But it is time to hand the reins to others. I have been

a publisher for a long time and my love for the profession

continues undiminished. I am deeply pleased about the

Sincerely,

Ed T. Dell

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by 40%, effective July 1. According to Business China , it

is only a matter of time before the move trickles down to

U.S. manufacturers. Business China says the price for both

neodymium and dysprosium ‘continues to rise steeply due

to mining restrictions and the cutting of export quotas for

rare-earth minerals by China.’”

China exports more than 90% of the world’s rare-earth

metals and houses more than one third of the world’s

reserves, according to Business China . The market is con-

trolled by the Chinese government, which in recent years

has limited export quotas.

Industry News and Developments

By Vance Dickason

Neodymium Prices “Skyrocket”

Voice Coil magazine has featured news about the continu-

ally rising price of China-sourced Neodymium for several

years. The consequences of this are obvious; however, the

news is now showing up in other industry market-oriented

publications such as CE Pro . Here is an excerpt from the

July 13 article in CE Pro , written by James Knott titled,

“Why Loudspeaker Prices Will Skyrocket”:

Neodymium Price Up 1,400%

The price of neodymium has risen to RMB 1.4 million

per ton from RMB 100,000 per ton since the end of 2008,

when China issued a series of tightening measures for the

country’s rare-earth industry, according to a survey by the

21 st Century Business Herald. On June 3, 2010, Japan

enacted a series of emergency measures to prevent the

country’s consumer electronics manufacturing companies

from being held hostage by the price increase by China. The

Japanese government used 8.7 billion yen to buy rare-earth

metals in 2010.”

“Neodymium magnets used in low-profile loudspeakers

are set to increase in price by 40% on July 1. The cost for

the rare earth metal has risen by 1,400% since 2008. In

addition to skyrocketing prices for petroleum and copper

that have affected the cost of cabling, there is another loom-

ing crisis for the custom electronics industry: the increasing

price of neodymium, a rare-earth metal.

The magnets are instrumental in the manufacturing of

some low-profile loudspeakers from Definitive Technology,

Earthquake, Wisdom Audio, Totem Acoustic, BG Radia,

and Martin Logan. Not all manufacturers use neodymium

drivers, some use magnets made of ferrite, which has the

same properties as neodymium but requires a larger magnet.

Due to the rising prices of neodymium, Shin-Etsu

Chemical Co. Ltd., a neodymium supplier, raised its price

While Mr. Knott’s article focused on home audio loud-

speaker manufacturers, even harder hit will be pro sound

manufacturers which have been incorporating Neodymium

into large pro sound woofers and compression drivers for

MENLO

SCIENTIFIC

Liaison Between Materials,

Suppliers, & Audio Manufacturers

Engineering Consulting

for the Audio Community

Technical Support for Headset,

Mic, Speaker & Manufacturers

Product Development

Test & Measurement

Instrumentation

USA tel 510.758.9014

Michael Klasco

info@menloscientific.com

www.menloscientific.com

Sourcing Guidance

sponsors of “The Loudspeaker University” seminars

4

voice coil

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AUGUST 2011 5

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