Acoustic Magic - Voice Tracker II Array Microphone

Price: $496.80

Option 1?:   Replacement Wall Power Supply (Add $13.80)
Option 2?:   USB Adapter - 102A (Add $24.84)
Option 3?:   USB Wall Power Converter (USA Plug/Voltage) - 202 (Add $16.56)
Option 4?:   25 Foot Audio Extension Cable - 107 (Add $27.60)
Option 5?:   6 Foot Audio Cable - 204 (Add $15.18)
Option 6?:   DB 9 Connector Cable - 203 (Add $16.56)
Option 7?:   3.5mm Stereo Splitter - 108 (Add $15.18)
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Acoustic Magic - Voice Tracker II Array Microphone

The long pickup range and wide field of view make the Voice Tracker ideal for meetings and lecture recording, as well as conferencing applications. 

The Voice Tracker I can be used as an auxiliary microphone with conventional conferencing systems that have a good AEC. The Voice Tracker II has its own built in AEC, and consequently can be used with VoIP systems that do not have a robust AEC. 

Unidirectional microphones with an omnidirectional field of view

Improvements - July 20/2017

Locates and automatically follows talker

The magic in the Acoustic Magic Voice Tracker array microphone resides in the algorithms running on its internal DSP that enable it to form a listening beam and automatically and electronically steer that beam towards the active talker. This creates spatial filtering, which when combined with the 6 or 8 always on microphones in the array, create pickup ranges of 30 feet with a 360° field of view. 

Consequently, the Voice Tracker can pick-up questions from the class as well as lecture from the professor, enabling more than 350 schools and universities to choose the Voice Tracker I for lecture recording. 

Or, it can pick up questions from the audience in town meetings or comments around a board room conference table for meeting recording. The long pickup range and wide field of view make the Voice Tracker ideal for conferencing applications as well. The Voice Tracker I can be used as an auxiliary microphone with conventional conferencing systems that have a good AEC. The Voice Tracker II has its own built in AEC, and consequently can be used with VoIP systems that do not have a robust AEC. 

Voice Tracker Array Microphones can also be used for a hands-free/headset free automatic speech recognition with full vocabulary dictation products like Dragon NaturallySpeaking. The Voice Tracker’s long range make it ideal for home automation applications where a whole room has to be covered for command-and-control recognition. 

Electronically Locates & Automatically Steers Toward The Talker

Freedom of Movement

• Works at long range
• Suppreses Interfering Sounds
• Headset Quality WIthout the Headset 

The combination of these innovations allows the Voice Tracker to have extremely long pick up range. The ability to “hear” talkers throughout an entire room results in a strong economic advantage over the alternative of using several conventional microphones, coupled together through a mixer.

Automatically steers towards the talker

Freedom of Movement

• Works at long range
• Suppreses Interfering Sounds
• Headset Quality WIthout the Headset

The combination of these innovations allows the Voice Tracker to have extremely long pick up range. The ability to “hear” talkers throughout an entire room results in a strong economic advantage over the alternative of using several conventional microphones, coupled together through a mixer.

The addition of a high-quality AEC algorithm to our internal DSP is the main differentiating feature of the Voice Tracker II Array Microphone, but it has several other attributes as well.

Turns inexpensive VoIP based telephony systems like Skype and Adobe Connect into Conferencing tools.

Electronically Locates & Automatically Steers Toward --The Talker
A crucial audio requirement for conferencing is the elimination of acoustic echo (sound from the far end talker picked up by the open mic and sent back). The Voice Tracker II Array Microphone’s internal AEC algorithm provides performance that rivals or exceeds that of AEC boxes costing several thousand dollars.

Connect the Voice Tracker II Array Microphone to your PC based VoIP software and eliminate the need to use headphones; all the near end talkers will be heard, even if they talk softly or are far away from the mic, and the far end talker will hear no echo.

Audio Spectrums for AEC


Acoustic Echo occurs when an open mic picks up a far end talker (from the loudspeaker) and sends it back to the far end talker (as an echo). In the above charts, the bottom chart shows the audio from near end and far end talkers transmitted by the Voice Tracker II with acoustic echo cancellation off. The top chart shows a similar audio transmission with the AEC turned on.

Output recording of the Voice Tracker II with AEC Off
Output recording of the Voice Tracker II with AEC On

Voice Tracker II Features

Automatic electronic steering of “listening beam” to talker location
Two stage noise reduction (spatial filtering and noise reduction processing)
Built in High Quality Acoustic Echo Cancellation.
6 element, 10 inch long mic array for long range
Mute Mode
5 element “in range” light to indicate location of chosen talker and sufficiency of signal
Talker location signal thru DB 9 jack (cable optional)

Improved Portability

The Voice Tracker II is significantly smaller than the Voice Tracker I. The Voice Tracker II’s primary audio output is USB and it is powered by its USB connection, eliminating the need to be connected to wall power. Not only does this remove the need to carry the wall power converter, it eliminates the need to have different wall power converters for different countries.

Talker Location Signal

Since the Voice Tracker automatically and electronically steers a listening beam to the active talker, it knows the location of the talker. In the Voice Tracker™ II this information is made available outside the DSP as a RS 232 serial word through a DB-9 Jack. A sophisticated customer can use this information to point a camera, or turn the head of a robot toward the talker. Note that Acoustic Magic does not provide any algorithms for the use of the location information.

VoIP conferencing in small rooms/huddle rooms

There are two value proposition for the Voice Tracker II in conferencing applications. The first is its ability to pick up talkers as far as 20 feet away from the microphone, with a 360° field of view. Conventional conferencing systems like the Polycom really use only one microphone at a time and have limited pickup range.
The second is acoustic echo cancellation (AEC). In a conferencing application, acoustic echo cancellation is vital. Acoustic Echo occurs when the far end talker's voice is picked up from the loudspeaker in the near end and sent back to the far end as an echo. Some VoIP products have good AEC, and in those cases you can use a Voice Tracker I. But if they do not have a robust AEC, the Voice Tracker II, which has its own internal high-performance AEC, remedies the problem.


The value proposition is similar to that for conferencing. Often the Voice Tracker two is connected directly to a camera, which has no AEC capability, so the AEC feature is even more important.

Automatic speech recognition

EMR for doctors important application for automatic speech recognition. The microphone most used for this application is a Phillips speech mic, which is a handheld device. Many doctors (and lawyers) want to be hands-free (or headset free). In those cases the Voice Tracker II is ideal. It does not take up much space on the table and it's very effective for recognition accuracy at ranges up to a few feet.

Assistive applications

Because the Voice Tracker II is so portable (it is relatively small and could be powered by the USB in the laptop) it can be used by deaf students to get translations (by sign language) in classrooms.

For additional application ideas, scan our user comments page.

Voice Tracker II Specifications


20+ feet for meeting recording (depends on acoustic characteristics of the room).

AEC Performance

G.167 Compliant
80 db of echo cancellation in single talk
40 db of echo cancellation in double talk
160 ms of echo tail length
14 dB of background noise reduction
Convergence time of less than 100ms
Sample rate: 48KHz

Primary audio output


Secondary audio output

Mic level or Line level (switch controlled) 3.5mm mono jack
6ft male/male audio cable (optional) 500 ohm output impedance

Talker location signal accuracy

5 degrees

Frequency Response

100Hz - 11,250 Hz

Physical Dimensions

Length: 11.5″
Height: 1.5″
Weight: 0.75lbs

Power Equipment

Powered by USB (wall-powered converter optional)
400 ma

Compatible with a variety of operating systems including

Apple/Macintosh: Mac OS, Mac OS X
Microsoft: Windows 3.x, Windows 95,Windows 98,Windows NT, Windows 2000,Windows ME, Windows XP, Windows Vista, Windows 7, Windows 8

NOTE: For the voice Tracker II to work on a mac you have to use a USB audio output adapter.  There is nothing special about the USB adapter. Just connect the analog audio signal to the pink Jack and the USB plug to the PC or Mac

Voice Tracker II User Instructions

Improvements (July 20/2017) we’ve made to the Voice Tracker™ II

Noise reduction

The algorithm for reduction of stationary noise (noise from fans, etc.) has been improved by 6 DB

Audio Output Level

In the previous version of the VT II, there were two USB output level selections: Mic level and Mic level plus 8db. With today’s change, the output level can be continuously selected thru the level control in the properties tab in the recording device control in the computer.

Stereo Audio output

Previously, output from the audio out jack was mono, through a mono connector. Voice Tracker II now has mono output through a stereo connectors audio out and speaker out jacks, so dual loudspeaker will be active


The Voice Tracker™ II can be connected to a PC or Mac through its USB connection. If the Voice Tracker™ II‘s acoustic echo cancellation feature is not required, the USB connection is all that is necessary. Power to the unit comes from the computer, and USB audio should be selected as the default recording device. The improvement in ease-of-use comes if acoustic echo cancellation is required. To prevent the far end talker’s voice coming back to him as an echo, the Voice Tracker™ II needs a sample of the signal coming out of the loudspeaker. Previously this was obtained by splitting the speaker out 3.5 mm cable, with part going to the reference in Jack on the Voice Tracker™ II and the other part going to the loudspeaker.

With today’s change to the Voice Tracker™ II, the speaker out signal is connected to the Voice Tracker™ II and the loudspeaker is also connected to the Voice Tracker™ II, eliminating the need for a splitter. Additionally, the reference signal to the Voice Tracker™ II can come from the 3.5 mm speaker out Jack on the computer, or directly through USB (select the Voice Tracker II USB as the playback device on the computer), eliminating the 3.5mm reference cable connection.

As before, the audio output from the VT II can be USB or analog thru its 3.5mm audio out jack.


Using the Voice Tracker Array Microphone as an External Microphone to an iPhone

People use our Voice Tracker array microphones to record meetings, or for conferencing, because of its long pickup range (20 to 30 feet) and 360° field of view. 

Our Voice Tracker array microphones are designed to be connected to PCs or other devices either through a 3.5 mm analog audio connection (through a soundcard) or a USB connection. The Voice Tracker I has only an analog output, but can he be easily converted to USB using a USB adapter like our part 102A. The Voice Tracker II has both an analog audio output and a USB audio output. 

Their analog outputs are at mic level, with low impedance, and work well with sound cards. The boost in the soundcard is designed to bring the output up to usable levels. High levels of boost can be employed because of the good signal-to-noise ratio in the microphones. 

From time to time we have received inquiries about connecting the Voice Tracker microphones to an iPhone (or other smart phones). Initially, this couldn’t be done because the iPhone required a very specific output impedance from the external microphone. If the impedance didn’t match what the iPhone was looking for, it would default to the built-in microphone. 

Fortunately, impedance matching connectors have become available to eliminate this roadblock. 

We have tested an “ iPhone 1/8 inch microphone adapter to 3.5 mm four conductor TRRS male” adapter from KV connection (part number code KM-iPhone-mic), and it works just fine. Similar adapters are available from other manufacturers. Rode has told us that their adapters also match the iPhone’s impedance requirement, but we have not tested one. 

Note that when the KV connection adapter was connected to the iPhone, we lost the speaker output. 

This can be corrected by first connecting a” 3 .5 mm 4 pin to 2 x 3 pin 3.5 mm headset splitter adapter” to the iPhone. This adapter is available from companies like StarTech. The arm labeled microphone was connected to the Voice Tracker, and the arm labeled headset was connected to our PC speaker to create a long-range speakerphone with the Voice Tracker I as the mic and the PC speaker as the speaker.


Accoustic Magic Blog

These Universities Trust the Acoustic Magic Array Microphone for their lecture recording needs

Allen College 
Ambrose University College 
American University 
Arizona State University 
Arkansas State University 
Athens State University 
Auburn University 
Augusta State University 
Babson College 
Bainbridge Graduate Institute 
Bakersfield College 
Baylor College of Medicine 
Baylor University 
Bellevue College 
Bellingham Technical College 
Berklee College of Music 
Bismarck State College 
Blinn College 
Bluffton University 
Boise State 
Boston College 
Boston University 
Brockport College 
Burlington Community College 
California State Northridge 
California State University East Bay 
Calvin College 
Cambrian College 
Carnegie Mellon University 
Casper College 
Cayuga Community College 
Charles Sturt University (Australia) 
Chatham University 
University of Ottawa 
City University of Seattle 
City University of NY 
Claremont College 
Clark College 
Clarke University 
Clemson University MBA Program 
Clemson University School of Nursing 
Clover Park Technical College 
College of the Canyons 
College of Court Recording 
Coppin State 
Cornell University 
Creighton University 
CSUS College of Continuing Education 
Cuyahoga Community College 
Dade Medical College 
Dallas Christian College 
De Anza College 
Defiance College 
Dickinson State University 
Downing College (UK) 
Duke University Medical Center 
D’youville College 
East Carolina College 
Eastern Connecticut State University 
Eastern Illinois University 
Eastern Kentucky University 
Eastern Oregon University 
Eastern Virginia Medical School 
EC Drury School 
Edison State College 
El Centro College 
Emory University 
Everett Comunnity College 
Fanshawe College 
Faulkner University 
Fayettville School District 
Furtwangen University 
Ferris State University 
Florida A&M University 
Florida Atlantic University 
Florida International University 
Georgia Gwinnett College 
Georgia Tech 
Gonzaga University 
Green River Community College 
Haverford College 
HeriotWatt University 
Highline Community College 
Hodges University 
Hofstra Law School 
Illinois State University 
Indiana University 
Indiana State University 
Indiana Wesleyan University 
Inver Hills Community College 
Iowa State University 
Iowa Western Community College 
Ivy Tech Community College 
Iwate Prefectural University 
Jacksonville State University 
Johns Hopkins 
John Marshall Law School 
Judson College 
Kansas City Kansas Community College 
Lake Michigan College 
Lincoln University 
Lincoln University (New Zealand) 
Lindsey Wilson College 
Linn Benton Comm. College 
Long Island University 
Loma Linda University 
Los Angeles Community College 
Los Angeles Southwest College 
Lowcountry Graduate Center 
Lower Columbia College 
Marshall U 
Medical College of GA – SAHS 
Miami University (of Ohio) 
Michigan State University 
Middle Georgia Technical College 
Missouri Southern State University 
Missouri University of Science &Tech 
Montana State University 
Montana Tech University 
Montgomery College 
Montgomery Country Community Col 
Mountain State University 
Mt. Holyoke 
Murray State College 
National Louis University 
New Mexico State University 
New Mexico Tech 
New York University 
North Arkansas College 
North Carolina A&T State University 
North Carolina State University 
Northeast Ohio Medical University 
North Idaho College 
North Iowa Area CC 
North Island College (Canada) 
Northeastern Illinois University 
Northern Arizona University NAU ITS 
Northern Kentucky University 
Northwood University 
Ohio University 
Ohio State University College of Nursing 
Oregon Health and Science University 
Oregon State University 
Pace University 
Palm Beach Community College 
Pasadena Area Community College 
Pellissippi State TCC 
Peninsula College 
Penn State 
Pierce College 
Pima Community College 
Pontificia University Javeriana 
Purdue University 
Quinsigamond Community College 
Radford University 
Rice University 
Ridgewater College 
Roanoke Showan Community College 
Robinson College of Business 
Rochester Institute of technology RIT – Online Learning 
Rutgers University 
Saddleback College 
Sam Houston State University 
San Francisco Unified School District 
Scripps College 
Seattle Pacific 
Seton Hall University 
Shattuck-St. Marys 
Shoreline Community College 
Sonoma State University 
South College 
Southern Polytechnic State University 
Southside Virginia Community College 
Spalding University 
St. Cloud State 
St John Fisher College 
St. Joseph’s University 
St. Louis University 
Stanford University Med Center 
Stony Brook University 
SUNY Oswego 
Syracuse University 
Tacoma Community College 
Texas A&M 
Texas Lutheran University 
Texas Southern University 
Texas Tech University 
The Sage Colleges 
The University of Waikato 
Towson University 
Truman State University 
Tufts University 
Tulsa Community College 
Tyler Jr. College 
UC Clermont College 
UC Davis 
UCLA Anderson School of Management 
Universidad Politecnica Valencia 
Universite de Montreal 
University of Alabama 
University of Alabama Fort Smith 
University of Alaska 
University of Alaska – Geophys Institute 
University of Alberta 
University of Arkansas 
University of University of Arizona 
University of Arkansas School of Law 
University of Calgary 
University of California at Berkeley 
University of California, San Francisco 
University of Cape Town 
University of Central Florida 
University of Central Lancashire (UK) 
University of Colorado at Boulder 
University of Delaware 
University of Georgia 
University of Houston – Victoria 
University of Illinois 
University of Illinois, GSLIS 
University of Iowa 
University of Kansas Hospital 
University of Louisville 
University of Maine 
University of Maryland 
University of Massachusetts 
University of Memphis 
University of Michigan 
University of Michigan – Dearborn 
University of Michigan – Flint 
University of Minnesotta 
University of Missouri – Rolla 
University of Montana PTS 
University of Nebraska 
University of Nevada – Reno 
University of New England (Australia) 
University of North Alabama 
University of North Carolina Charlotte 
University of North Carolina Wilmington 
University of North Florida 
University of North Texas 
University of Northern Iowa 
University of Notre Dame 
University of Ottawa 
University of Pennsylvania 
University of Pittsburgh 
University of Rochester 
University of Rochester School of Nursing 
University of Saskatchewan 
University of South Carolina 
University of South Florida 
University of Southern California 
University of Southern Indiana 
University of St. Thomas 
University of Tennessee 
University of Texas 
University of Texas – Arlington 
University of Texas – Pan America 
University of Texas – Southwestern Medical Center 
University of Texas – Tyler 
University of Toronto 
University of Tulsa 
University of Vermont 
University of Virginia 
University of Washington School of Nursing 
University of Washington 
University of Washington – Tacoma 
University of Western States 
University of Wisconsin-Greenbay 
University of Wisconsin-Madison 
University of Wisconsin-Oskosh 
Utah State University 
Valencia College 
Virginia Commonwealth University 
Virginia Tech 
Wake Forest 
Walla Walla Community College 
Washington and Lee University 
Washington University (of St. Louis) 
Wayne State University 
Wellesley College 
West Texas A&M University 
Western International University 
Western Kentucky University 
Western Michigan University 
Westminister College 
Williston State College 
Winona State University 
Winston-Salem State University 
Wright State University 
Yakima Valley Community College 
Yukon College

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Bruce M on 12/25/2008 08:07am
I have used Dragon NaturallySpeaking on a daily basis in my work as a securities litigator for at least a dozen years. During that time I have experimented with many microphones looking for the optimal combination of accuracy and comfort. I have at last found that optimal combination in the Acoustic Magic microphone array. In an office environment where external noises can be excluded (such as by closing a door) Acoustic Magic is as accurate as the best wired headset microphones (and better than wireless headsets), but without the inconvenience and discomfort of wearing something on your head/ear. I heartily endorse Acoustic Magic for any serious user of voice recognition software in such an environment.
Bruce M

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