1 INDUSTRY NEWS 
& DEVELOPMENTS
By Vance Dickason 
10 DIRECTORY
Amplifier and DSP Vendors
By Nora Wong

16 ACOUSTIC PATENTS
By James Croft

22 TEST BENCH
A Compression Driver from Radian Audio 
and the Updated CQ76 RibbonTweeter 
from BoZhen New Audio Lab 
By Vance Dickason
36 INDUSTRY WATCH 
By Vance Dickason

1 INDUSTRY NEWS & 
DEVELOPMENTS
Raising the Bar for Rub & Buzz Defect Detection—New APx500 Software

 8 SPOTLIGHT
Some Speaker Problems 
That Needed Solving
By Bruno Putzeys and Lars Risbo 

Directories
12 Global Voice Coil Winders 
and Converters 2021 
By Nora Wong

17 Magnet Vendors and Distributors 2021 By Mike Klasco and Nora Wong

26 ACOUSTIC PATENTS
By James Croft

30 TEST BENCH

 New Coaxial 5.25” Pro Sound Driver 
from B&C Speakers 
By Vance Dickason

37 INDUSTRY WATCH 
By Vance Dickason

 1 FOCUS
Adhesive Joints, Acoustic, and Other Treatments for Environmental Robustness
By Mike Klasco

 9 DIRECTORY
Adhesives, Coatings, Sealants, Converters, and Dispensers 2021
By Mike Klasco and Nora Wong 

14 ACOUSTIC PATENTS
By James Croft

TEST BENCH
18 A Home Audio 6.5” Midbass Tansducer from Purifi Audio 
By Vance Dickason

24 A Pro Sound 12” Driver from Beyma’s New LEX Series
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

1 SPOTLIGHT - CTA-2010: A Better Way to Measure Subwoofers
By Brent Butterworth

 10 DIRECTORY
Headphone Test & Measurement  - Equipment Directory 2021
By Mike Klasco and Nora Wong 

16 ACOUSTIC PATENTS
By James Croft

TEST BENCH

22 SB Acoustics’ Satori MW16TX-8 Textreme Woofer 
By Vance Dickason

30 BDNC’s BGF-46166-18-4-003 Glass-Composite Woofer
By Vance Dickason

37 INDUSTRY WATCH 


1 SPOTLIGHT
Comprehensive Transducer Testing 
in 24 Minutes
By Andrew Taylor

 10 FOCUS
The Secret Life of Plastic Film Diaphragms: PEEK High-Performance Film Diaphragms and Cones for Headphones and Speakers
By Mike Klasco 

DIRECTORIES

13 MEMS Speaker Vendor Directory 2021  
By Mike Klasco and Nora Wong

15 Microspeakers 2021: 
Key Vendors for Mobile Electronics  
By Nora Wong
18 ACOUSTIC PATENTS
By James Croft
TEST BENCH

22 A 1/4” Pro Sound Compression Driver
 from Eighteen Sound 
By Vance Dickason

26 A High-End Dome Tweeter 
from Kartesian
By Vance Dickason
29 INDUSTRY WATCH 
By Vance Dickason

 1 SPOTLIGHT
Practical Considerations for
Quality Control Testing of Loudspeakers
By Daniel Knighten and Eric Hodges

 10 FOCUS
Audio Cables and Connectors
By Mike Klasco and Nora Wong

14 DIRECTORY
Cable and Connector Vendors 2021  
By Mike Klasco and Nora Wong

16 ACOUSTIC PATENTS
By James Croft
TEST BENCH

22 Eighteen Sound’s ND1TP 
Compresson Driver and XT120 Horn 
By Vance Dickason

26 Beyma’s New CD-11Nd 
Compression Driver and TD-194 Horn
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

 1 SPOTLIGHT
How to Measure Free-Field Speaker 
Response without an Anechoic Chamber
By Steve Temme

 8 FOCUS
Plastics and Composites for 
Audio Products 2021
By Mike Klasco

12 DIRECTORY
Speaker Enclosure Vendor Directory 2021  
By Nora Wong

16 ACOUSTIC PATENTS
By James Croft
TEST BENCH

22 The New D2404/552000 
Ellipticor Tweeter from Scan-Speak 
By Vance Dickason

26 The New AT60NC-4 AMT Tweeter 
from SB Acoustics’ Satori Line
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

1 FOCUS
Cone Industry Overview 2021
By Mike Klasco and Nora Wong

8 DIRECTORY
Loudspeaker Cone/Diaphragm 
Industry Suppliers 2021  
By Nora Wong

15 ACOUSTIC PATENTS
By James Croft
TEST BENCH

18 Wavecor’s FR070WA05 
Aluminum Cone Full-Range 2.75” Driver 
By Vance Dickason

24 The AUGWL0006-JN01 
Aluminum Cone Woofer from 
Eastech’s Punktkilde Line
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

 
1 FOCUS
Headphone OEM Devices and Parts
By Mike Klasco

5 DIRECTORY
2021 Earphone and Headphone Manufacturers
By Nora Wong

8 FOCUS
Headphone Engineering: A Helpful Cheat Sheet
By Mike Klasco
10 DIRECTORY
Headphone and Earphone Parts Directory for 2021  
By Nora Wong
14 SPOTLIGHT
A New Standard of Low-Depth Racetrack Speaker Drivers with Flat Core Speaker Technology 
By Brian Cho
18 ACOUSTIC PATENTS
By James Croft
TEST BENCH
26 The BWX-6502 Midbass from 
MISCO’s Bold North Audio Line 
By Vance Dickason

34 Wavecor’s TW022WA09  Cloth Dome Tweeter
By Vance Dickason
37 INDUSTRY WATCH 
By Vance Dickason

1 INDUSTRY NEWS & DEVELOPMENTS 

10 LAB NOTES
Phase, Group Delay, and Impulse Response: A Quick Primer
By Christopher J. Struck

12 FOCUS
MEMS and Hot Technologies for 2021
By Mike Klasco

14 DIRECTORY
MEMS and Other Leading-Edge Devices for Wearables  
By Nora Wong

20 ACOUSTIC PATENTS
By James Croft

TEST BENCH
26 The BWX-6501 from MISCO’s Bold North Audio Line 
By Vance Dickason

34 The BDT-2901 High-End Silk Dome Tweeter
By Vance Dickason

37 INDUSTRY WATCH 
By Vance Dickason

1 INDUSTRY NEWS & DEVELOPMENTS 
6 SPOTLIGHT
Better Microspeakers Utilizing Hiperco Alloys
By Md Mehedi
10 FOCUS
This Year’s Crop of Measurement Microphones
By Mike Klasco
12 DIRECTORY
Measurement Microphone Directory 2020  
By Nora Wong
TEST BENCH
20 The NERO 6MRN150D 
Midrange Woofer from SB Audience 
By Vance Dickason
25 The SDx10 Woofer from CSS Audio
By Vance Dickason
29 INDUSTRY WATCH 
By Vance Dickason

 1 SPOTLIGHT
Nuvoton Introduces Smart Amp Evaluation Platform with Klippel Controlled Sound Technology
By Jin Kim and Jonathan Gerbet

8 DIRECTORY
2020 Integrated Electronics, Powered Speaker Vendors and DSP Specialists 
By Mike Klasco and Nora Wong

14 ACOUSTIC PATENTS
By James Croft

TEST BENCH
20 Scan-Speak's 21WE/4542T00 Ellipticor Midwoofer 
By Vance Dickason

26 Omega Audio’s 29 mm Cloth Dome Tweeter
By Vance Dickason

30 INDUSTRY WATCH 
By Vance Dickason

 
1 FOCUS
Audio in Vietnam: 
An Introduction to a Brave New World
By Mike Klasco and Nora Wong

DIRECTORIES
8 Vietnamese Audio Industry Vendors 
By Nora Wong

13 Vietnam Audio Industry Trade Shows
By Nora Wong
14 SPOTLIGHT
Thin-Film High-Frequency Transducers 
(Part 2): The LT2/LT6 Ribbon Transducers
By Igor Levitsky
18 ACOUSTIC PATENTS
By James Croft
TEST BENCH
22 A Pro Sound Compression Driver 
from Oberton 
By Vance Dickason

26 A Home Audio TeXtreme Diaphragm Tweeter from SB Acoustics’ Satori Line
By Vance Dickason

30 INDUSTRY WATCH 
By Vance Dickason

1 SPOTLIGHT
Thin-Film High-Frequency Transducers 
(Part 1): The Advantages
By Igor Levitsky
10 FOCUS
Voice Coils: A Tutorial 
By Mike Klasco
14 DIRECTORY
Global Voice Coil Winders 
and Converters 2020
By Nora Wong
18 ACOUSTIC
PATENTS
By James Croft  

TEST BENCH
20 The LT2 Ribbon Transducer and 
Waveguide from Radian Audio Engineering
By Vance Dickason

25 The 140FCD 1" Compression 
Driver from REDCATT
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

1 SPOTLIGHT
Unravelling the Technical Solutions in 
Waterproofing of Audio Devices
By David Lindberg
7 DIRECTORY
Adhesives, Coatings, Sealant, and Dispenser Providers 2020 
By Mike Klasco and Nora Wong 

14 ACOUSTIC
PATENTS
By James Croft  

TEST BENCH
18 The L19RNX1 from SEAS’ 
New Prestige Titan Series
By Vance Dickason

24 The LD25X from 
Creative Sound Solutions
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

1 FOCUS
The Speaker Industry 
Supply Chain for 2020
By Mike Klasco
8 SPOTLIGHT
Comparative Studies on the 
Behavior of Beryllium, Titanium, and 
CN Fiber Hybrid Dome in the Last Octave
By Peyu Vlaevski 
10 ACOUSTIC
PATENTS
By James Croft  
TEST BENCH
16 Eminence’s Tour Grade 
NSW4018-8 18” Woofer
By Vance Dickason
23 Eminence’s Tour Grade
N314X Compression Driver
By Vance Dickason

27 INDUSTRY WATCH 
By Vance Dickason

 1 FOCUS
Trends in Mobile Audio and Microspeakers
By Mike Klasco
10 DIRECTORY
Microspeakers 2020: Key Vendors for Mobile Electronics
By Nora Wong
14 SPOTLIGHT
High-Quality Horn Loudspeaker Systems: 
History, Theory & Design
Review by Mike Klasco

16 ACOUSTICPATENTS
By James Croft  
TEST BENCH
20 Fane’s 18NDXL Imperium
By Vance Dickason
25 Celestion’s CDX14-3040 
Compression Driver
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

 
1 INDUSTRY NEWS 
& DEVELOPMENTS
By Vance Dickason
10 FOCUS
Recent Developments with 
Loudspeaker Enclosure Materials
By Mike Klasco
17 DIRECTORY
Speaker Enclosure Vendor Directory 2020
By Nora Wong
20 LAB NOTES
Improved Zobel Network
By Christopher J. Struck

22 ACOUSTIC
PATENTS
By James Croft  
30 TEST BENCH
A Home Audio Transducer from 
Eastech’s Punktkilde Line of Transducers
By Vance Dickason
36 INDUSTRY WATCH 
By Vance Dickason

FOCUS - Speaker Cones—Fabrication, 
Materials, Performance (Part 1)
By Mike Klasco

8 DIRECTORY
Loudspeaker Cone Industry Suppliers 2020
By Nora Wong

16 ACOUSTIC PATENTS
By James Croft  

TEST BENCH
18 LaVoce’s New High-Power 10” Midbass Driver
By Vance Dickason



24 Radian Audio’s New 1.4” Compression Driver
By Vance Dickason

28 INDUSTRY WATCH 


1 INDUSTRY NEWS & DEVELOPMENTS
By Vance Dickason
8 DIRECTORY
2020 Earphone and Headphone Manufacturers
By Nora Wong
12 DIRECTORY
Headphone/Earphone Parts Directory 2020
By Nora Wong
16 CALENDAR
Earphone and Headphone Events 2020 
By Nora Wong 

18 ACOUSTIC
PATENTS
By James Croft  


TEST BENCH
24 LaVoce’s New 1” Compression Driver
By Vance Dickason
30 Oberton’s New 1.4” 
Compression Driver
By Vance Dickason
38 INDUSTRY WATCH 


1 INDUSTRY NEWS & DEVELOPMENTS
By Vance Dickason
8 SPOTLIGHT
A Novel Constant Directivity Horn
By Dario Cinanni
18 FOCUS
The Coming Impact of MEMS Audio in 2020
By Mike Klasco
24 DIRECTORY
2019 MEMS Loudspeaker Directory 
By Nora Wong 

26 ACOUSTIC
PATENTS
By James Croft  


TEST BENCH
32 A Pro Sound Transducer
from Dayton Audio
By Vance Dickason
40 A Pro Sound Transducer from BMS
By Vance Dickason
44 INDUSTRY WATCH 
By Vance Dickason

1 INDUSTRY NEWS & DEVELOPMENTS
By Vance Dickason

6 FOCUS Measurement Microphones: Today and Tomorrow
By Mike Klasco

8 DIRECTORY
Test & Measurement Microphones 2019 
By Nora Wong 

17 ACOUSTIC PATENTS
By James Croft  

20 TEST BENCH
Pro and Home Transducers from Dayton Audio and Eastech’s PUNKTKILDE Line
By Vance Dickason

29 INDUSTRY WATCH

1 INDUSTRY NEW & DEVELOPMENTS
By Vance Dickason
10 SPOTLIGHT
2019 AES International Conference on Headphone Technology
By Mike Klasco 

12ACOUSTIC
PATENTS
By James Croft  


18 TEST BENCH
Home and Pro Drivers from Precision Devices and Eastech’s Punktkilde Line
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

1 INDUSTRY NEW & DEVELOPMENTS
By Vance Dickason
10 SPOTLIGHT
2019 AES International Conference on Headphone Technology
By Mike Klasco 

12ACOUSTIC
PATENTS
By James Croft  

18 TEST BENCH
Home and Pro Drivers from Precision Devices and Eastech’s Punktkilde Line
By Vance Dickason

29 INDUSTRY WATCH 
By Vance Dickason

 
1 SPOTLIGHT
Inside ALMA International Symposium & Expo and InfoComm 2019 
By Mike Klasco and Nora Wong 

8 DIRECTORY
Global Voice Coil Manufacturers 2019
By Nora Wong 

12 ACOUSTIC PATENTS
By James Croft

18 TEST BENCH
Two New Graphene-Coated 
Magnesium Cone Drivers from SEAS 
By Vance Dickason

30 INDUSTRY WATCH 
By Vance Dickason

1 INDUSTRY NEW & DEVELOPMENTS
By Vance Dickason
8 SPOTLIGHT
Electroacoustic Measurements 
of Headphones
By Christopher J. Struck 

13 DIRECTORY
Adhesives, Coatings, Sealant, 
and Dispenser Providers
By Nora Wong 

18 SPOTLIGHT
Loudspeakers for Vented Enclosures
A Backward Approach for Speaker Selection (LoVE BASS)
By Francisco Castells and José Manuel Requena 

22 TEST BENCH
Faital Pro’s New 6RS140 
and TB Speaker’s W8-2314
By Vance Dickason

36 INDUSTRY WATCH 
By Vance Dickason

1 FOCUS
Headphone Measurement Equipment 
By Mike Klasco 

6 DIRECTORY
Headphone Test & Measurement Gear 2019
By Mike Klasco 

16 SPOTLIGHT
Asian Trade Show Spring Marathon
By Mike Klasco and Nora Wong 

18 ACOUSTIC PATENTS
By James Croft

22 TEST BENCH
Two New Woofers from Faital Pro 
and Wavecor 
By Vance Dickason

40 INDUSTRY WATCH 
By Vance Dickason

 
1 SPOTLIGHT
Asian Speaker Manufacturing 
Outside of China 
By Mike Klasco 

10 FOCUS
Loudspeaker Enclosure Materials (Part 2): 
New and Improved Enclosure Materials
By Mike Klasco 

14 ACOUSTIC PATENTS
By James Croft

18 TEST BENCH
Two New 1” Compression Drivers: 
Celestion’s CDX1-1732 and 
SB Audience’s 44CD-K 
By Vance Dickason

28 INDUSTRY WATCH 
By Vance Dickason

1 FOCUS
Trends in Microspeakers 
By Mike Klasco 

8 DIRECTORY
Microspeakers 2019: 
Key Vendors for Mobile Electronics
By Nora Wong 

12 ACOUSTIC PATENTS
By James Croft

16 TEST BENCH
Two New Woofers: 
One from SEAS’ New Extreme Line 
and the Other from B&C Speakers 
By Vance Dickason

28 INDUSTRY WATCH 
By Vance Dickason

 
1 FOCUS
Loudspeaker Enclosure Materials (Part 1): 
A Review and Look Ahead
By Mike Klasco 

8 DIRECTORY
Enclosures Manufacturing Directory 2019
By Nora Wong and Touy Ken 
10 SPOTLIGHT
New Port Technology from Quest Engines:
Stratified Stream Ports
By Elario Dalmas II
14 ACOUSTIC PATENTS
By James Croft

20 TEST BENCH
Three New Tweeters: One from BlieSMa 
and Two from SB Acoustics 
By Vance Dickason

30 INDUSTRY WATCH 
By Vance Dickason

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Concise, timely and accurate, Voice Coil is your one-stop source to stay competitive in the loudspeaker industry! Every month, Voice Coil delivers loudspeaker professionals with the latest in technology and components. Vance Dickason and other industry experts provide a comprehensive collection of reviews on the loudspeaker products you use every day: drivers, test and measurement software, cones, ferrofluid, piezoelectrics and more!

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Voice Coil - October 2017

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