 
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 FOCUS
China + 1 Audio Manufacturing
Sourcing Series
The Philippines
By Mike Klasco
9 DIRECTORY
Global Voice Coil Winders
and Converters 2022
By Nora Wong
14 DIRECTORY
Magnet Vendors and Distributors
Directory 2022—The Americas
By Mike Klasco
16 ACOUSTIC PATENTS
By James Croft
TEST BENCH 21 B&C Speakers DE111-8 1” Pro Sound
Compression Driver
By Vance Dickason
25 The MD60N-6 2.5” Dome Midrange
from the SB Acoustics Satori Line
By Vance Dickason
28 INDUSTRY WATCH By Vance Dickason

1 INDUSTRY NEWS &
DEVELOPMENTS
By Vance Dickason
8 FOCUS
New Thin-Film Technologies
for Coatings and Treatments
By Mike Klasco
12 DIRECTORY
Adhesives, Coatings, Sealants, High-Tech Thin
Films, Converters, and Dispensing Equipment
By Mike Klasco and Nora Wong
19 ACOUSTIC PATENTS
By James Croft
23 TEST BENCH Scan-Speak’s 38WE/8582T00
15” Ellipticor Oval Voice Coil Woofer
By Vance Dickason
30 SEAS’ W15CH001 5.25”
Excel Hexadym Motor Midwoofer
By Vance Dickason
36 INDUSTRY WATCH By Vance Dickason

1 INDUSTRY NEWS &
DEVELOPMENTS
By Vance Dickason
8 DIRECTORY
Headphone Test & Measurement
Equipment Directory 2022
By Mike Klasco and Nora Wong
16 ACOUSTIC PATENTS
By James Croft
20 TEST BENCH Celestion’s CDX1-1412 Compact
1” Pro Sound Compression Driver
By Vance Dickason
25 TB Speaker’s 75-1558SH
High-End Home Audio 3” Dome Midrange
By Vance Dickason

1 INDUSTRY NEWS &
DEVELOPMENTS
By Vance Dickason
8 FOCUS
Innovative Speaker Drivers
By Mike Klasco
DIRECTORIES
12 Microspeaker Vendor Directory 2022
By Nora Wong
16 MEMS Speaker Subdirectory 2022
By Nora Wong
18 Haptic Actuator Sourcing Directory 2022
By Nora Wong
20 TEST BENCH The E180HE-44 Full-Range Subwoofer
from the Dayton Audio Epique Line
By Vance Dickason 28 The 2FE24 Pro Sound 2.5”
Full-Range from FaitalPRO
By Vance Dickason
36 INDUSTRY WATCH By Vance Dickason

1 INDUSTRY NEWS &
DEVELOPMENTS
Loudsoft Releases FINE Suspension Nonlinear FEA
Spider and Surround Design Program
By Vance Dickason
8 FOCUS
Cables, Lead Wires, and
Connector/Terminal Technology
By Mike Klasco
12 DIRECTORY
Cable and Connector Vendors 2022
By Mike Klasco and Nora Wong
16 ACOUSTIC PATENTS
By James Croft
18 SPOTLIGHT
The Possible End of Entry-Level Products
By Mike Klasco
20 TEST BENCH The AMT 23CM1.1-C Air Motion
Transformer from Mundorf
By Vance Dickason 24 Beyma’s New 1” CD1ND Compact Polyimide
Diaphragm Compression Driver and TD-194 Horn
By Vance Dickason
28 INDUSTRY WATCH By Vance Dickason

1 INDUSTRY NEWS &
DEVELOPMENTS
Tectonic’s New Next-Generation BMRs
By Vance Dickason
6 FOCUS
Some Thoughts on Plastics for Enclosures
By Mike Klasco
10 DIRECTORY
Speaker Enclosure Vendor Directory 2022
By Nora Wong
14 ACOUSTIC PATENTS
By James Croft
18 TEST BENCH The U80W Air Motion Transformer
from Mundorf
By Vance Dickason 23 Eighteen Sound’s NSD1095N
Compression Driver and XT120 Horn
By Vance Dickason
28 INDUSTRY WATCH By Vance Dickason

IN THIS ISSUE
V O L U M E 3 5 , I S S U E 4 J A N U A R Y 2 0 2 2
1 SPOTLIGHT
Next-Generation Speaker Diaphragms from
Composite Sound—Metamodal TPCDs
By Martin Turesson
10 FOCUS
Loudspeaker Cones, Domes, and Surrounds
Advancements in Materials and Processes
By Mike Klasco
14 DIRECTORY
Loudspeaker Cone/Diaphragm
Industry Suppliers 2022
By Nora Wong
24 ACOUSTIC PATENTS
By James Croft
30 TEST BENCH
SB Acoustics’ MW19TX-8 Home Audio
TPCD (TeXtreme) Cone Midbass Driver
By Vance Dickason
37 INDUSTRY WATCH By Vance Dickason

IN THIS ISSUE
V O L U M E 3 5 , I S S U E 3 J A N U A R Y 2 0 2 2
1 FOCUS
Next-Generation Rare-Earth-Free Magnets Are Coming
Iron Nitride and an Inside Look at Niron Magnetics
By Mike Klasco and Salvador Magdaleno-Adame
10 DIRECTORY
2022 Earphone and Headphone Manufacturers
By Nora Wong 14 FOCUS
VM Sound’s Liquid Injection Molding Silicon
Next-Generation Headphone Surrounds
By Dave Lindberg 16 DIRECTORY
Headphone and Earphone Parts Directory for 2022
By Nora Wong 20 DIRECTORY
MEMS and Other Unique Earphone Drivers 2022
By Mike Klasco and Nora Wong
22 ACOUSTIC PATENTS
By James Croft
26 TEST BENCH The SB Acoustics MW13TX-4 Home Audio 5”
TPCD Cone Midbass Driver
By Vance Dickason 32 Wavecor’s New WF275BD01
10.75” Home Audio Woofer
By Vance Dickason 37 INDUSTRY WATCH By Vance Dickason

1 INDUSTRY NEWS &
DEVELOPMENTS
By Vance Dickason
8 DIRECTORY
Measurement Microphone Directory 2021
By Nora Wong
22 ACOUSTIC PATENTS
By James Croft
28 TEST BENCH The E150HE-44 5.5” Full-Range Subwoofer
from the Dayton Audio Epique Line
By Vance Dickason
36 The 10NW76 Pro Sound High SPL 10”
Driver from B&C Speakers
By Vance Dickason
44 INDUSTRY WATCH By Vance Dickason

1 INDUSTRY NEWS & 
DEVELOPMENTS
By Vance Dickason 

 6 SPOTLIGHT
New Earphone Technology
Balanced Frequency Range
By Aleksandar Aleksov

 8 FOCUS
Subwoofers and Bass 
More Bang (or Woof) for Your Buck
By Mike Klasco 

13 ACOUSTIC PATENTS
By James Croft
TEST BENCH

16 Purifi Audio’s PTT4.0X04-NFA-01 
Home Audio 4” Midbass 
By Vance Dickason

24 The AMT200P Pro Sound AMT and 
XMT200 Horn from Eighteen Sound
By Vance Dickason


29 INDUSTRY WATCH 
By Vance Dickason

FROM THE EDITOR’S DESK—Home Theater and Home Entertainment, by J. Martins, p. 4
USound Megaclite 4.0 UH-R2040 MEMS Earphones, by Brent Butterworth, p. 8
MARKET UPDATE—Raising the Bar on Residential Entertainment, by J. Martins, p. 14
The Complete Linear Audio Library on USB, Review by Gary Galo, Bob Cordell, and Dimitri Danyuk, p. 28
SOUND CONTROL—A Tale of Speakers in a Room, by Richard Honeycutt, p. 32
Ultra-Linear: Why It Works And When It Will Not (Part 1): The Fundamental Questions, by Morgan Jones, p. 38
Cascodes, Folded Cascodes, and Current Mirrors (Part 1): Cascodes and Folded Cascodes, by Morty Tarr, p. 44
Refurbishing Altec Lansing Vintage Speakers, by Bruce Heran, p. 50
The Tetrahedral Test Chamber Story (Part 2): Consistent Loudspeaker Measurements, by Geoff Hill, p. 56
HOLLOW-STATE ELECTRONICS—Effects of Negative Feedback, by Richard Honeycutt, p. 60

 

1 INDUSTRY NEWS & 
DEVELOPMENTS
OEM DSP Active Line Level Crossovers 
from Danville Signal
By Vance Dickason 


 6 SPOTLIGHT
DaS AuReality—
3D Loudspeaker Technology
By Joe Hayes 

14 FOCUS 
An Introduction to Smart Speakers 
for Speaker Engineers 
By Mike Klasco

20 TEST BENCH

 Three New 25mm High-Frequency 
Transducers from BlieSMa 
By Vance Dickason

30 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 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

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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 - January 2021

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In this issue