TASCAM Supplies Professional-Grade Headphones


TASCAM’s TH-2000 professional-grade headphones are designed for serious audiophiles.

TASCAM, the Pro Audio Division of TEAC America, has been supplying and revolutionizing the market with professional-grade products for decades. Its most recent contribution is the TH-2000 headphones.

The TH-2000 headphones offer a powerful bass response, midranges that round out the mix, crystalline high-frequency ranges for a strong presence and clarity, comfort for hours of listening and use, durability, and TASCAM quality.

TASCAM, creator of the original TH-02 headphones is taking its professional-grade headphones a step further with the TH-2000. The TH-2000’s main features include: a foldable design for easy compact transport, circumaural ear cuffs with an industrial strength flexible headband, and a closed-back isolating design.

The headphone specifications include a 53-mm driver diameter, 60-Ω impedance, 101-dB ±3 sensitivity, 22-kHz-to-18-Hz frequency response, and 1,800-mW maximum power.

For more information, visit http://tascam.com.

NTi XL2-TA Receives Type Approval

The XL2-TA Sound Level Meter has received Class 1 approval.

The XL2-TA Sound Level Meter has received Class 1 approval.

The XL2-TA sound level meter has received Class 1 type-approval from the Physikalisch-Technische Bundesanstalt (PTB) in Germany. The XL2-TA in combination with the M2230 measurement microphone, is officially listed as a type-approved Class 1 sound level meter. The XL2-TA is suitable for environmental noise, occupational health, and sound insulation applications where the measurements require certification.

Receipt of the type-approval certificate confirms the XL2-TA (in combination with the M2230 measurement microphone and the ASD cable) offers full compliance with the Class 1 sound level meter requirements in accordance with the International Electrotechnical Commission (IEC) standards 61672 and 61260 and meets the American National Standards Institute (ANSI) S1.4 Type 1 performance. The XL2-TA offers certified spectral measurements in octave and third-octave resolution, which further comply with Class 0 filter specifications.

The M2230 measurement microphone connected to the XL2-TA via the ASD cable configuration enables the user to monitor the level readings on the instrument display while Class 1 measurements are taken. The NTi Audio Precision Calibrator completes the portable measurement kit offered in the compact system case.

Customers may upgrade their XL2 analyzers to a type-approved XL2-TA by adding a retrofit kit. Contact your local NTi Audio partner for the upgrade. For more information about the XL2 Analyzer and obtaining the type-approval 0ption, visit www.nti-audio.com/XL2.

ADLINK Introduces a Signal-Acquisition Module


ADLINK’s USB-2405 supports four analog input channels.

ADLINK Technology now offers the USB-2405, a four-channel USB 2.0 dynamic signal-acquisition module. The module’s built-in IEPE excitation current source provides 2 mA on each AI channel. BNC connectors enable the USB-2405 to provide high accuracy and excellent dynamic performance for microphone and accelerometer measurement in vibration and acoustic applications.

The USB-2405 offers a portable solution for time-frequency analysis and research that includes accuracy with low temperature drift, built-in anti-aliasing filters, support for flexible trigger mode, and a USB power.

The USB-2405 supports four analog input channels simultaneously sampling up to 128 kS/s. It delivers 100-dB dynamic range and –94-dB THD of dynamic performance. Built-in anti-aliasing filters enable the filter cutoff frequency to be automatically adjusted to the sampling rate, suppressing out-of-band noise and avoiding measurement distortion.

ADLINK’s USB-2405 also supports auto-calibration for ensured accuracy and minimizes temperature drift in the field. The USB-2405’s low DC measurement drift, along with temperature deviation, optimizes accuracy in spite of the environment.

The USB-2405 provides a lockable USB to enhance connectivity. The included multi-functional stand fully supports desktop, rail, or wall mounting. ADLINK’s easy-to-use U-Test software is included at no extra charge. With no programming required, the USB-2405 delivers fast, easy instrument setup and quality data acquisition. The USB-2405 supports Windows 8, Windows 7, and Windows XP OSes and is fully compatible with third-party software (e.g., LabVIEW, MATLAB, and Visual Studio.NET).

For more information, visit www.adlinktech.com.

Aphex Releases Audio Xciter App Update

Aphex, a leader in audio enhancement technology for more than 35 years, has updated its popular Audio Xciter app for the Android smartphone and tablet platform. The updated version provides a more responsive user interface and greater stability, fixing previous problems with in-app upgrades.

Audio Xciter has been popular with iPhone and iPad owners. This update brings Android users a new listening experience with Aphex’s patented audio processor technology—the same technology pros have been using for years in the studio and on stage. The Audio Xciter app’s familiar interface provides instant access to the user’s library, playlists, and Bluetooth playback support, with studio-quality enhanced playback.

An update for the Audio Xciter app on the iOS platform (iPhones, iPods, and iPads) is currently in the works. Try Audio Xciter for Android platforms for free on GooglePlay (http://bit.ly/17Rt6Z7).

Global Specialties Releases New Digital AC/DC Power Supply

Global Specialties’s 1315D is a durable general-purpose AC/DC power supply.

Global Specialties’s 1315D is a durable general-purpose AC/DC power supply.

Global Specialties has introduced the 1315D, a new rugged, general-purpose AC/DC power supply that features variable outputs of 0 to 25 V at 5 A with digital LED (green) displays for motoring voltage and current outputs.

This unique power supply is a low-cost, space-saving solution for applications requiring AC/DC voltages. The 1315D is specifically designed for educational use and prototyping, covering a range of circuit testing applications. This simple AC/DC power source can demonstrate the concept of alternating and non-alternating voltages. It can also be used for simple experiments powering lamps, resistors, and so forth. The unit includes a voltmeter and an ammeter for AC/DC voltage and current readings. The 1315D costs $590.

For more information, visit www.globalspecialties.com.

Member Profile: Costas Sarris

Costas Sarris

Costas Sarris

Member Name: Costas Sarris

Location: Thessaloniki / Greece

Education: B Sc, Business Computers

Occupation: Medical Engineer at Biolab Lp Diagnostics

Member Status (how long you have been subscribing to audioXpress): -

Affiliations: Monolith Magnetics audio transformers tester / Mythos Audio ( Hi End speaker Manufacturer ) / Member in most popular Hi Fi forums /

Audio Interests: Hand made Tube Audio projects. Power Tube Amps / Tube Pre-amps / Guitar amps

Most Recent Purchase: a pair of NOS 12AX7 tubes

Current Audio Projects: 2A3 Single Ended Tube Amp / 300B SE Power Tube amp / Single Ended Guitar Tube Amp based on 6L6GC power tube

Dream System: Speakers : Altec Model 19 Circa / Power Amp : Audio Note Ongaku / audio research ref 2 preamp

Industry Watch: September

Dr. Amar Bose (1929–2013)

Amar Bose, founder of Bose, passed away on July 12, 2013. (Photo courtesy of Bose Corp.)

Amar Bose, founder of Bose, passed away on July 12, 2013. (Photo courtesy of Bose Corp.)

Amar Gopal Bose (Amar Gopal Boshu) died recently at his home in Wayland, MA.

He was born November 2, 1929, and became the chairman and founder of Bose Corp. (see Photo 1). An American electrical engineer of Bengali descent, he was listed on the 2007 Forbes 400 list with a $1.8 billion net worth. The child of an Indian Bengali father and an American mother, Bose was born and raised in Philadelphia, PA. His father, Noni Gopal Bose, was an Indian freedom revolutionary from Bengal who, having been imprisoned for his political activities, fled Kolkata (Calcutta) in the 1920s to avoid further prosecution by the British colonial police.

Amar Bose first displayed his entrepreneurial skills and interest in electronics at age 13, when, during the World War II years, he enlisted school friends as co-workers in a small home business, repairing model trains and home radios to supplement his family’s income. Bose graduated from Abington Senior High School and entered Massachusetts Institute of Technology (MIT), graduating with a BS in Electrical Engineering in the early 1950s.

Bose spent a year in Eindhoven, The Netherlands, in the research labs at NV Philips Electronics and a year in Delhi, India, as a Fulbright student. In India, he met his wife, Prema, from whom he later divorced. He completed his PhD in electrical engineering from MIT, and wrote a highly mathematical thesis on nonlinear systems. Following graduation, Bose took a position at MIT as an assistant professor. He focused his research on acoustics, which led him to invent a stereo loudspeaker that would reproduce, in a domestic setting, the dominantly reflected soundfield that characterizes the listening space of the audience in a concert hall.

Bose was awarded significant patents in two fields, which, to this day, remain important to the Bose Corp. These patents were in the area of loudspeaker design and nonlinear, two-state modulated, Class D power processing.

During his early years as a MIT professor, Bose bought a high-end stereo speaker system at a RadioShack in 1956. He was reportedly underwhelmed by its performance. This would eventually pave the way for his extensive speaker technology research, which concentrated on key weaknesses in the high-end speaker systems available during his time and focused on psychoacoustics, which would become a hallmark of the company’s audio products. Bose Corp. was founded in 1964 with initial capital from several investors, including his MIT thesis adviser and professor, Dr. Y. W. Lee, who invested his life savings in the effort.

Applying similar psychoacoustic principles to headphone technology, Bose created the Tri-Port Earcup Drivers. Today, Bose Corp. is a multifaceted entity with more than 12,000 employees worldwide that produces products for home, car, and professional audio, and conducts basic research in acoustics, automotive systems, and other fields. As a privately held company, Bose Corp. does not publish its financial numbers; however a few hundred shareholders receive audited annual financial statements. In addition to running his company, Bose remained a professor at MIT until 2000.

Bose President Bob Maresca remembered the man behind the name, saying in a statement that the company is “deeply saddened” by his passing.

“It is impossible to put into words what Dr. Bose meant to each of us, and to [the company],” Maresca said. “He was more than our chairman. He was our teacher—always encouraging us, always believing that we could do great things, and that anything was possible.”

Dr. Bose is pictured with his mentors Dr. Y. W. Lee, far left, and Professor Norbert Wiener, right, at MIT's Research Laboratory of Electronics in 1955. (Photo courtesy of Bose Corp.)

Dr. Bose is pictured with his mentors Dr. Y. W. Lee, far left, and Professor Norbert Wiener, right, at MIT’s Research Laboratory of Electronics in 1955. (Photo courtesy of Bose Corp.)

Bose carried that mantra into his work as an MIT teacher, joining the faculty in 1956 and spending more than 45 years as an educator. He retired in 2001. According to MIT President L. Rafael Reif, “Amar Bose was an exceptional human being and an extraordinarily gifted leader. He made quality mentoring and a joyful pursuit of excellence, ideas, and possibilities the hallmark of his career in teaching, research, and business. I learned from him and was inspired by him, every single time I met with him.”

During his tenure at MIT, Bose started a research program in physical acoustics and psychoacoustics and received the Baker Teaching Award in 1963–1964, among other honors (see Photo 2). In 2011, Bose gave the school the majority of his company’s stock in the form of nonvoting shares, ensuring that all dividends would be used for the school’s education and research mission.

His son, Vanu Bose, is the founder and CEO of Vanu, a firm whose software-based radio technology provides a wireless infrastructure that enables individual base stations to simultaneously operate GSM, CDMA, and iDEN. Amar Bose’s daughter, Maiya, is a chiropractor.


Timothy Dorwart (1955–2013)

Timothy Dorwat, CEO of Community Professional Loudspeakers, passed away on July 15, 2013.

Timothy Dorwat, CEO of Community Professional Loudspeakers, passed away on July 15, 2013.

Timothy Dorwart, formerly of Whitehall, PA, passed away on July 15, 2013, after a valiant 10-year battle with cancer (see Photo 3). He was 58. An industry leader and a mentor to many, Dorwart was known as a warm and gentle man who loved his family and his friends. He had more than 30 years of sales, manufacturing, and management experience in the pro audio and music industries.

Dorwart had an impressive career. He spent 20 years as the Director of the Bose Professional Services Division, followed by four years as a Vice President for DMX Music. From 2007 to 2010, he led the Stanton Group through a successful turnaround as its CEO. He guided the acquisition of the Stanton Group to Gibson Guitar, forming its new Pro Audio Division. Dorwart served as the General Manager of the Gibson Guitar Pro Audio Division, until he accepted the position as CEO of Community Professional Loudspeakers in February 2013.


Pure Audio Ships New Jongo Products

Pure Audio, the Internet-radio and docking-speaker company, has shipped the first products in its Jongo wireless multi-room audio lineup. The Jongo series consists of two tabletop Bluetooth/Wi-Fi speakers, a Bluetooth/Wi-Fi adapter that connects to existing stereo systems, and a Pure Connect iOS and Android app.

The app uses Wi-Fi to act as a Jongo-system controller, simultaneously streams songs stored on a mobile device to multiple speakers, and concurrently streams Internet radio stations and music services to multiple speakers. The app accesses more than 20,000 radio stations, about 200,000 free on-demand programs and podcasts, and the Pure Music subscription-streaming service.

Two different songs can be simultaneously streamed to different speakers if two mobile devices are used at the same time. With Bluetooth, users can stream music stored on a mobile device and any app’s audio to one speaker at a time.

The Pure Connect app also enables users to direct PC-stored music to Jongo speakers. Only one song at a time can be streamed. The $199 Jongo S3 portable, rechargeable wireless speaker and the $129 A2 multiroom hi-fi adapter are available from several retailers, including Amazon, Target, OfficeMax, and Pure.

The Pure Connect app for iOS devices is available with an Android version to be released later this year. The company also plans availability of the 100-W AC-only tabletop T6 speaker. The A2, J3, and T6 incorporate built-in Wi-Fi 802.11b/g with WEP and WPA/WPA2 support; Ethernet port; and decoding of WMA, AAC, MP3, MP2, and FLAC audio files. The AC/DC J3 features a 3.5” neodymium upward-firing mid/bass driver and four 0.75” high-frequency drivers in 360° with a total 10-W RMS output. Its rechargeable battery pack delivers at least 10 h of listening per charge. The J3 and T6 come with color grille options. The A2 adapter incorporates 24-bit internal DAC and optical, coaxial, and dual (RCA) phono analog audio outputs.


Bowers & Wilkins Introduces the CM10

Bowers & Wilkins is replacing the flagship speaker in its CM series, bringing technologies used in its reference 800 series to the CM series for the first time. The CM10 replaces the CM9 and became available in August at a suggested price of $4,000 per pair.

The new CM10 is shown with a painted black-gloss finish. (Photo courtesy of Bowers & Wilkins)

The new CM10 is shown with a painted black-gloss finish. (Photo courtesy of Bowers & Wilkins)

The CM10 will be available in a painted black-gloss finish or in two real-wood veneers, rosewood or wenge. With the new technologies and other improvements, the CM10 plays louder than its predecessor, delivers more extended bass and delivers better imaging with lower distortion.

Technologies incorporated from the 800 series include a tweeter placed on the top of the speaker cabinet, which provides better imaging and dispersion and creates a more natural, spacious sound. The tweeter’s aluminum dome is strengthened using a second aluminum layer to stiffen the whole structure and prevent the voice coil from going “out of round” at higher frequencies. As a result, the double dome pushes the first break-up frequency up from the standard dome’s 30 to 38 kHz. This makes the tweeter “more piston-like” in the audible frequencies below 20 kHz and delivers greater clarity and control even at high volume levels. Putting the tweeter on top of the cabinet also helped open space for three bass drivers instead of two without increasing cabinet height. The result is increased sensitivity, deeper bass, lower distortion, and higher maximum output, the company said.

For the first time in a CM series speaker, the midrange driver, a Kevlar FST driver, is decoupled from the rest of the cabinet to reduce cabinet coloration. Moving the midrange closer to the top of the cabinet also improves dispersion and increases the sense of airiness.


Circuit City for Sale

Circuit City, the stores still empty with the Circuit City logo showing, is up for sale once again. Current owner Systemax has put the trademark and domain names of Circuit City and fellow former consumer electronics (CE) chain CompUSA up for sale after consolidating those businesses under its TigerDirect brand last year. The company acquired Circuit City’s intellectual property in a 2009 bankruptcy auction and purchased the CompUSA brand and 16 of its stores in 2008, as former Systemax retail executive Gilbert Fiorentino sought to fill a CE market vacuum.

Fiorentino later resigned and returned millions to Systemax amid charges of kickbacks and theft. He reached a separate settlement with the SEC last year. Last month, his brother, Carl Fiorentino, was indicted and now faces jail time for taking millions in bribes from Systemax suppliers. According to Hilco Streambank, which is handling the sale, the Circuit City and CompUSA websites drew “tens of millions” of annual visits under Systemax, while its co-branded chain of CompUSA and TigerDirect stores grew to 43 locations at its peak.

VOXX Sees Gain Despite Slower Sales

VOXX International turned a net profit and higher operating income, but sales were slightly off in its fiscal first quarter, which ended May 31. Its net income was $2.1 million in the quarter compared with a prior year’s net loss of $4.7 million. Operating income for the quarter was $3.4 million, an 11.6% gain over the year-ago period performance of $3.1 million. Net sales were $193 million, a decrease of $1 million, or 0.5%, compared with net sales of $194 million reported in the comparable year-ago period, VOXX reported.

Automotive sales for the quarter were $104.9 million, an increase of 4.5% over $100.4 million reported in the comparable period last year.

Premium audio sales for the fiscal 2014 first quarter were $40.2 million, an increase of approximately 1.7% as compared with $39.5 million reported in the comparable period last year. Voxx had growth in its domestic operations, primarily driven by higher sales of new soundbar products and premium wireless speakers. This growth was partially offset by lower international sales, predominantly in Europe.

Consumer accessories sales were $47.6 million for the quarter, a decrease of approximately 11.8% as compared with $54 million reported in last year’s comparable period. This decline was related to lower international sales, mostly in Europe. The declines were partially offset by increased sales in domestic operations, driven primarily by higher sales of wireless speakers and personal sound amplifier products, VOXX said. As a percentage of sales for the fiscal first quarter, automotive represented 54.3%, premium audio represented 20.8%, and consumer accessories had a 24.7% share.

Q&A: Meir Mordachai – Morel Founder Finds Inspiration in Innovation

Meir and Oren Mordechai

Meir and Oren Mordechai

Meir Mordechai attributes the company’s success to its revolutionary designs

SHANNON BECKER: What sparked your initial interest in audio?

MEIR MORDECHAI: Music has always been a big part of my life. The love of music and my curiosity as a child to know how musical instruments play and produce different sounds led me to explore the audio field and experiment with electronics and speakers.

I’m still as passionate today about music as I was then. I regularly attend concerts and live performances to make sure that my ears are “tuned” to what musical instruments sound like, unedited, in their natural state, if you will.

SHANNON: Describe your first personal loudspeaker project. Why did you build it? Is it still in use?

MEIR: I was relatively young when I began my research and building projects. It was at the age of 11 when I tried to improve a speaker by changing its cone for another that I put together from wood veneer.

In my generation, information or electronic products were not readily available as they are today. The lack of access to valuable resources was possibly a key reason that motivated me and many others to build and innovate.

SHANNON: Your company, Morel (www.morelhifi.com), headquartered in Israel, has introduced major technological and design innovations that redefined the state-of-the-art loudspeaker technology. Can you discuss some of them?

MEIR: The desire to innovate has always driven me forward. I realized a long time ago that replicating a product would not necessarily generate business and definitely wouldn’t differentiate me from the competition. The principles of investing significant resources in new product development and in innovating and designing new ways to build speakers has been the core value behind Morel to this day and contributes greatly to our success.

There are several key technologies that were developed over the years that became the platform for our products. Our large external voice coils (EVCs) are one of the signature elements in our speakers. It turned traditional speaker design inside out. The idea was to place the magnetic drive system within the voice coil, eliminating stray magnetic flux by effectively directing all the magnetic energy to the voice coil. The result is an ultra efficient and powerful design that is highly compact with efficient heat dissipation and reduced cone breakup for lower distortion.

Because our magnet systems are placed within the large-diameter voice coils, we always had to invent new ways to achieve more magnetic energy from small magnets. Developing the double and hybrid magnet systems has enabled us to continue to enjoy the great acoustic benefits of the large-diameter voice coils.

There are many more technologies that were developed and employed in our products over the years. We continue to refine these technologies with newly developed materials that become available to us. At the same time, we keep improving the production process to increase consistency and efficacy. We never cease to research and find new ways to improve the sound reproduction; it’s a never-ending journey.

SHANNON: Tell us about Morel’s very first product. How did it come about and is it still being sold today?

MEIR: The first Morel-branded product I made was a 9” mid-bass driver, which employed a 3” coil with a paper composite cone and a single ferrite magnet motor system. Later on the development of the double-magnet system replaced the single-magnet system, immensely improving the product performance. The earlier version of the 9” driver became the foundation for several products that employ some of the original attributes of the design to this day.

SHANNON: Morel has been in business for 38 years. To what do you attribute your success?

MEIR: It can be attributed to many decisions made over the course of 38 years, but most importantly the core values I mentioned earlier, that I adopted early on, and the people who make up this company, are at the heart of our success.

I have always insisted on total design and manufacturing control. It enabled us to have the flexibility in speaker design and the ability to react quickly when needed. Time and time again it has proven to be the best decision I have ever made.

Our focus on innovation and exploring new ways to design speakers has always driven us to new levels. This approach has put us at the forefront with the best speaker manufacturers and also differentiated us from the competition.

A lot of the credit for that has to go to the many people at Morel. Without everyone here we would not have achieved such a high degree of success today. I could not have done all of this by myself. I have been blessed to meet and work with some of the most amazing, hard-working individuals throughout my life. Our production workers, designers, engineers, salespeople, managers, and our global business partners abroad are passionately working to promote our company.

Photo-2-MorelSHANNON: As Morel’s founder and principal designer for many years, what has been your best experience?

MEIR: The joy of designing a product, manufacturing it, and following its acceptance in the marketplace is something very special to me. The thrill and excitement of seeing other people enjoy our creation and design is a feeling that revitalizes me with the energy and drive to work on the next project.

SHANNON: Your son, Oren Mordechai, is now responsible for Morel’s unique design. How did that come about? Did you encourage his interest in audio?

MEIR: Oren grew up practically in the factory, because that is where I spent most of my time. From a very early age, he loved to be on the production floor and try everything. I would not say I encouraged his interest—he just loves it as much as I do. I am lucky to say that today he is doing excellent work developing new products, venturing into new materials and innovative designs that have received industry recognition and many prestigious awards worldwide. There is no bigger satisfaction for a father than to see his son following one’s lead and continuing the tradition.

SHANNON: Are you working on or planning any new audio innovations?

MEIR: We are always working on various projects. There is never a dull moment in our Research and Development department. Since Morel caters to the home audio, car audio, and raw drivers market segments, it seems we always have new products to release.

Our most recent innovation for the DIY/OEM segment is the Ti series, which employs titanium as a bobbin (former) for our oversized coils. The new Titanium series presents very special sound characteristics and parameters that enable speaker designers to achieve better resolution and dynamics in smaller enclosures. We are also developing new magnetic systems and chassis structures that will be implemented in future products to be released later this year.

SHANNON: Your dream has been to create the perfect loudspeaker. What achievements have you made along the way and how close are you to fulfill your dream?

MEIR: The dream of creating the perfect loudspeaker can only be a dream. Over the years I have learned that in the loudspeaker field, which is partly “science” and partly “art” there is no such thing as “perfect.” My ambition is to create a speaker that appeals to the largest audience possible, while reproducing music in its most natural and authentic form, free of any distortion.

Only those who have experienced speaker building can understand the obstacles and compromises that have to be made in order to achieve this objective. Even with 38 years of know-how and a fully capable manufacturing facility, we still struggle to overcome the physical boundaries and acoustic challenges to achieve the sound we want.

SHANNON: What do you see as some of the greatest audio innovations of your time?

MEIR: There were many, but the one that transformed the industry is the transition from analog to digital. I never liked the format of a music record, as it is bulky and highly vulnerable to being damaged. At the same time, this format produces high-quality sound. As a child, I always thought this format had to change. The shift to CDs to complement, you might say, the vinyl record suits me. But it seemed to me a radical change at the time.

Whether you like it or not, nobody can refute the fact that the digital age has made music more accessible to people. Because of the new digital formats, the interface that people use today can be very common, ranging from a high-end CD player, digital streamers, or smartphones, and so forth. That’s remarkable.

SHANNON: Do you have any advice for audioXpress readers who want to build their own sound systems?

MEIR: You do not need to have a speaker company or an engineering degree to design and build good speakers. I began as a hobbyist like many in your audience probably. Reading, researching, and experimenting with different components and ideas were the only ways I was able to learn what it takes to build a good speaker. In today’s digital culture the amount of information available is almost infinite; use it to your advantage.

Keep your designs as simple as possible. Some will make you believe that a complicated crossover is a must for a good speaker to perform well. I have always spent most of the time developing quality drive units. Using quality components will minimize the need for corrective measures when you build your crossovers and cabinet.

As with anything, have fun doing it. Put your soul and heart into it. I was lucky enough to be able to transform my passion for music and building speakers into a successful business. It may happen to you. aX

Audio Crossword Answers (September 2013)

The answers to audioXpress’’ September audio crossword puzzle are now available.



1.    SUPERTWEETERS—Optimized for the highest audible frequencies
4.    XMOS—Provides single-tile mulitcore microcontrollers
7.    ISOBARIC—Loudspeaker with two or more identical woofers  operating simultaneously in a single enclosure
8.    LODGE—Credited with dynamic drivers’ modern design
10.    GRAMOPHONE—19th-century horn loudspeaker
12.    MICROCONTINUITY—Relates to the natural extension f* of a real function f
14.    QUADRATUREENCODER—Measures a rotating shaft’s speed and direction  [two words]
16.    GIBBSPHENOMENON—One cause of ringing artifacts in signal processing [two words]
17.    LINKWITZ—An audio engineering visionary
18.    GIMBAL—Enables an object’s rotation around a single axis
19.    TOROIDAL—Annular shaped


2.    EQUIVALENTINPUTNOISE—Microphone and preamplifier specification [three words]
3.    WHIZZER—Located between the voice coil and the primary cone
5.    MAGNETOSTRICTIVE—These speaker types don’t require suspensions or voice coils
6.    ROHS—Limits use of dangerous materials
9.    ROOMCONDITIONS—Environmental factors affecting transducers [two words]
11.    WATERFALL—I.e., cumulative spectral decay
13.    AMBISONICS—Uses multichannel mixing technology
15.    CONSTANTAN—T is the ANSI symbol for copper and this material
20.    OHM—Alt + 234 provides this unit’s symbol

AX September: Teacher and Innovator

We’d like to note the recent passing of world-renowned pro-sound innovator and longtime MIT professor Amar Bose. The sound and electrical engineer founded Bose audio company in 1964.

News of his death in July, at age 83, came as this issue was in production. Since that time, much has been written about Bose’s contributions. Jan Didden, editor/publisher of Linear Audio, will explore Bose’s legacy more deeply in an article in next month’s issue of audioXpress.

In the meantime, here is a small tribute to Bose. His many accomplishments include inventing the 901 Direct/Reflecting Speaker System in 1968. The speakers were among the first to utilize the space around them, producing a mix of direct and reflected sound that re-created the dynamics of concert hall acoustics. Other popular innovations followed, including the Bose noise-canceling headphones and the Bose Wave radio.

But Bose was also a committed and beloved teacher. In 2011, he gave MIT the majority of stock in the Bose company, as nonvoting shares. The dividends must be used to support MIT’s educational and research missions.

To hear Bose tell his own story, watch his 1996 talk titled “Experiences of an Academician in Industry,” available on the MIT website at http://video.mit.edu.

Mary Wilson