Industry & Product News
Audio Precision New Module Enables MEMS Microphone Array Testing with Simultaneous Analysis of Up to 16 PDM Channels
Audio Precision introduced the PDM 16 module for its APx500 Series audio analyzers. The new module offers simultaneous acquisition and measurement of up to 16 channels of PDM signals, making it the highest channel-count solution available for MEMS microphone and MEMS mic array testing. The new option supports anechoic tests with the acoustically silent remote pod that can be positioned at up to 10 meters, feeding 16 phase-aligned channels on eight data lines with accurate measurements via a delay-calibrated module .   Read More
Audeze Mobius Evolves with Waves Virtual Mix Room Unique 3D Audio Tools For Advanced Post-Production
Audeze announced a new partnership with Waves, adding a new functionality to the Audeze Mobius headphones for advanced audio post-production applications. Widely acclaimed as a gaming headset with its superior sound quality and integrated Waves Nx 3D technology, the Audeze Mobius will take advantage of new Waves Virtual Mix Room Plugin to create a new platform for advanced 3D Surround Sound pro-audio editing and mastering .    Read More 

Point Source Audio Receives Fourth Patent with Dual Element Lavalier Microphone
Point Source Audio, an audio equipment manufacturer from Petaluma, CA, specializing in the development of miniature microphones and headsets, has received US Patent No. D850,422 for the CO2-8WL, part of the company's CO2 Confidence microphone series. This design is the world's first fully redundant microphone in a wearable housing, providing an all-in-one solution for critical live sound and broadcast applications that require back-up miking .    Read More 
Dense Launches Adapt Reference High-Performance Portable USB Audio DAC
Dense, a San Jose, CA, -based audio startup, created the Adapt Reference audio DAC as a portable audio performance boost device for smartphones and personal computers. Dense successfully raised the funds for the production on Kickstarter and delivered the unique product to early backers. Now, the company has launched its homepage and the Adapt Reference DAC ($209.99) is now officially available and ready to be distributed worldwide.    Read More 

New TI Burr-Brown Audio Quad-Channel ADC Captures Voice at Four Time Larger Distances
No more yelling at smart speakers. Texas Instruments (TI) introduced a new audio analog-to-digital converter (ADC) capable of capturing clear audio up to four times farther away than competing devices. The new TI Burr-Brown TLV320ADC5140 audio ADC enables far-field voice capture and achieves a 120-dB dynamic range for clear, high-fidelity audio in smart home applications. The TLV320ADC5140 is the industry's smallest quad-channel audio ADC with this level of performance.    Read More 

Chirp and Synaptics Join Forces to Empower Smart Home Devices with Data-Over-Sound Connectivity
Chirp, the pioneers in data-over-sound, have joined forces with one of the leading companies in human machine interface (HMI) hardware and software solutions, Synaptics, in an effort to bring low-powered connectivity to consumer smart home devices. The collaboration targets seamless smart device experiences by embedding Chirp's data-over-sound software into Synaptics' edge computing SoCs.    Read More 
NTi Audio Offers Rapid Frequency Response Measurements with the XL2
Do you want to measure the frequency response of a speaker or audio component, and not have to wait until the lower frequencies stabilize? NTi Audio offers an innovative and practical solution with its Minirator MR-PRO and XL2 range of measurement instruments. The measurement uses two new MR-PRO test signals and a new, matching measurement function in the XL2, in which the signals contain a 1-second and a 4-second cyclic pink noise, from which the XL2 can quickly calculate a stable measurement result in real time .    Read More

Headphone Company MrSpeakers Changes Name to Dan Clark Audio and Introduces New Aeon 2 Headphones
In order to better reflect its focus on all things audio, the audio company known until today as MrSpeakers is now called Dan Clark Audio. According to the company's President and Founder, Dan Clark, the new name is a more accurate reflection of the company's role as a designer and manufacturer of a wide range of products well beyond loudspeakers. The new brand is also a strategic move at a time when the company is launching its most affordable Aeon 2 planar magnetic portable headphones.    Read More 

Guest Editorial
  Gary Galo

New York AES 2019
Expanded Audio Builders Workshop Program
The Audio Builders Workshop offered an expanded program at the 2019 convention of the Audio Engineering Society, held at the Javits Convention Center in New York City, October 16-19. The culmination of this year's program was a three-hour Build Clinic on the last day of the convention. Owen Curtin and Chris Kincaid ran this session, and attendance far exceeded their expectations. There were more than 40 participants, and each person was required to purchase a kit for the session, which they assembled onsite. Participants were given a choice of three kits, depending on their level of experience - the L2A Passive Preamp, the ABW Metronome, or the S-25 microphone.
Two audio builders assemble S-25 microphone kits at the AES Audio Builders Workshop Build Clinic. The microphone was one of three kits that participants could purchase.
The L2A Passive Preamp is a mono, transformer-based unit with a balanced XLR input and a 1/4-inch phone unbalanced output. The transformer is an Edcor 1437, and volume adjustment is done with a potentiometer on the transformer secondary. Details can be found on the DIY RE website. The ABW metronome is a very basic design based on the veteran 555 timer chip, and was also used at the 2018 session. Details are on the Clockworks website.
A more ambitious project was the S-25 microphone kit. Despite its modest price of $229 US, the S-25 is a real electret condenser microphone (ECM), with very good performance characteristics. Full details on the S-25 microphone kit can be found on the Micparts website. The description on the website notes: "The S-25 is a professional quality condenser microphone kit. The finished microphone has a Cardioid polar pattern and a switchable -10 dB pad (the switch is internal). It is sold in DIY kit form, designed for first-time DIY microphone kit builders as well as professional recordists in need of an affordable, high-performance workhorse microphone... Some people think a 'real' microphone needs to cost $500 or $1000 or more. We disagree. So do celebrity engineers who use this mic."
The microphone is built around a Transound TSB-2555 medium-size capsule, with a broad, smooth presence boost between 4 kHz and 12 kHz. The electronics consist of an ETL1 microphone preamp, which is designed for electret condenser capsules, and which can also be purchased separately. The circuit is transformerless, and is based on the Schoeps CMC5, which is one of the most highly-regarded microphones in the world. The website has a review of the microphone published in TapeOp magazine, along with audio clips comparing it to several other popular condenser microphones.  

These high school students participated in a special "Learn to Solder" session at the Audio Builder's Workshop Build Clinic.
Several high school students were invited to the session to learn how to solder. When I was in high school in the late 1960s, quite a number of students tried their hand at kit building, even though most would never pursue audio or electronics as a career. With the disappearance of names such as Heathkit, KnightKit, DynaKit, and Eico, soldering became a somewhat forgotten skill. This was an extremely important addition to the Build Clinic, in my view. The more hands-on electronics building experience young people can get, the better. The Audio Builders Workshop extends a special thanks to Mouser Electronics, and to the Audio Engineering Society (AES) for its continued support of this most worthwhile program.
Buddy Lee Dobberteen (right) mentors a participant during his session on building a BA500 microphone preamp kit. The session was one of several held at the Audio Builders Workshop booth on the AES exhibit floor.
Tony Santa Ana builds a BA500 microphone preamp kit at the Audio Builders Workshop booth. Like Dobberteen, Santa Ana is also a US Army veteran.
During the three days exhibits were open, the Audio Builders Workshop ran a series of half-hour sessions on various topics, all held at their booth on the exhibit floor. "Build a BA500 Kit" was a session given by Buddy Lee Dobberteen, proprietor of His Little Studio and Mentoring in Spring Branch, TX. Dobberteen got into DIY audio, recording and music to help him recover from severe depression after serving in Iraq. His company is dedicated to teaching people how to build equipment and use this equipment in their studios, and he has a special interest in the well-being of our veterans.
The BA500 is a high-quality microphone preamp kit that can be purchased for $168 US. The assembled price would be roughly three times that amount. The manufacturer, JLM Audio, notes that the kit contains every part needed "down to the last nut and bolt." The preamp is based around a transformer-coupled input and output, along with op-amp-based active circuitry. The BA500 is a module that is intended to be inserted into a JLM 500-series rack. The rack contains the appropriate input and output connectors.
The 2019 AES International Convention in New York once again included an Audio Builder Workshop booth and a series of events on the exhibition floor, featuring hands-on demonstrations with kit makers and expert builders, as well as in-depth sessions in the All Access Technical Program.
Full details on the BA500 can be found on the JLM Audio website, which donated the kits for this workshop. Unfortunately, the presenters at these booth workshops were forced to compete with loud music being played in two adjacent booths, the most annoying offender being the John Lennon Educational Tour Bus. The live music from this booth could be heard throughout the exhibit area. The AES used to have rules regarding allowable playback levels on the exhibit floor. Next year, I hope it will go back to enforcing them, in fairness to the other convention exhibitors. The Audio Builders Workshop is a workgroup of the Boston section of the Audio Engineering Society, and continues to be a most worthwhile endeavor.

Sponsored Content
The NXP NXH3670 Enables Ideal Wireless Headset Experiences
By  NXP Semiconductors
Inspired by a wish to enhance gaming audio, NXP Semiconductors designed a single-chip, high performance wireless audio streaming solution. The NxH3670 constitutes a highly integrated, single-chip ultra-low-power wireless transceiver with embedded MCU, targeted at wireless audio streaming for gaming headsets at very low latency. The NxH3670 runs a proprietary audio streaming protocol which has been optimized for gaming headset applications, providing high-quality forward audio streaming at low latency (<20 ms) combined with a simultaneous voice microphone backchannel. Additionally, a wireless data channel is available.    Check out NXP's proprietary ultra-low power, 2.4 GHz wireless gaming headphone solution

Voice Coil Test Bench
Airborne HR124B8-10L Wood Cone Midrange
By  Vance Dickason
The driver tested for this Test Bench is from Airborne, produced in China by long-time OEM manufacturer and high-end audio catalog retailer, Solen Electronique, Canada. The HR124B8-10L 4.5" midrange is intended for home hi-fi applications. This driver is built on a 6-spoke cast frame. The cone assembly consists of a curvilinear wood grain fiber cone, a 1.13" diameter wood fiber dust cap, and is suspended by an NBR surround and a 2.75" diameter flat cloth spider. This is driven by a 1.0" voice coil wound with copper wire on an aluminum former. While I think the wood cones have a very unconventional appearance, I have heard them incorporated into a two-way speaker and their subjective sound quality was very nice. This article was originally published in Voice Coil, August 2010 .    Read the Full Article Now Available Here
AX November 2019: Digital Login
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VC November 2019: Digital Login
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