audioXpress Magazine      December 2024

  audioXpress remains the authority on audio and reproduced sound by connecting manufacturers and distributors with developers, buyers and consultants around the globe! It's readers are the audio product designers, consultants, integrators, DIY enthusiasts, opinion leaders and your best customers. All of them agree that the coverage of trending topics, unique in the audio industry, make audioXpress a must read.

Every month, audioXpress combines the best educational articles on topic such audio electronics, speaker and headphone design, amplifiers (from tube to Class D), acoustics, practical test and measurement, audio engineering praxis, and standards. audioXpress provides inside stories on new audio developments, on R&D Stories, the most complete objective reviews of innovative products and software, and selects some of the best DIY audio projects from worldwide experts.

From the Editor's Desk: Wireless Audio Roadmap
New scalable codecs plus increased bandwidth will ensure better sound quality.
Editorial By J. Martins
Wireless audio is truly remarkable. Whenever I use my smartphone to play music on earbuds, in the middle of a busy street or on a plane, and I hear the music, the experience never ceases to amaze me. When I'm not at home, it's likely I'm streaming from a cellular network service directly to my smartphone, and using Bluetooth to stream from that device to two "true wireless stereo" earbuds or to headphones. (I previously downloaded my favorite music, but these days with 5G, most consumers just press play and never stop to think about how the "magic" happens.) In the audio industry, we tend to criticize Bluetooth for being the last link that still forces us to hear music in compressed form, disregarding the fact that the stream was playing from a central repository somewhere on the other side of the continent, or even in another country, and passing through a complex maze of network servers and cellular links until it reaches our devices. Chances are if we are playing the latest hit from Lady Gaga, that the stream is coming from a server close by, but not a chance if I have just selected my favorite obscure track from Killing Joke.
---> Wireless Audio Roadmap.

5 Supporting Companies

Features
8 SPL Phonitor 3 DAC / HeadAmp / Monitor Controller
With 120V Supply Rail
By Philipp Paul Klose
Sometimes audioXpress has the opportunity to
review something completely different that deserves
a thorough objective review. Targeting customers in
the studio and headphone enthusiasts, the latest SPL
Phonitor 3 DAC adds even more unique features and
value as a headphone amplifier, preamplifier, and
controller, using 120V supply rail technology.

36 QuantAsylum QA403 32-Bit Audio Analyzer
By Jan Didden
The QuantAsylum QA403 is the fourth generation
audio analyzer from the company founded by
Matt Taylor in 2012. Based out of Snoqualmie, WA,
QuantAsylum has been providing audio test and
measurement solutions to audio DIY'ers, enthusiasts,
professionals, and many companies around the
world. And with each iteration, the capability and
programmability of its audio analyzers continues to
grow.

42 RME Audio DPS-2 Power Supply
And LNI-2 DC Filter And Stabilizer
By Stuart Yaniger
When RME Audio released the new DPS-2 Power Supply
and LNI-2 DC Filter and Stabilizer the German audio
company left many of its faithful customers intrigued.
The two new solutions are designed to improve the
performance of its ADI-2 series of converters in critical
applications. How do they deliver?

56 Individual Transfer Curves Of MM Cartridges
Moving Magnet Cartridge Subassemblies
By Hans Polak
A moving magnet phono cartridge can be
characterized by its overall transfer function. But the
transfer function of the part that generates the signal
through magnetic induction has its own transfer
function, which can also be measured. By translating
the latter into an equivalent electronic circuit, further
insight and possibilities for optimization can be
obtained. Hans Polak explains.

Market Update – Wireless Audio
16 Bluetooth LE Audio And Auracast
Suppliers And Development Ecosystem
By J. Martins
Product development for a relatively new technology
can be challenging. This article intends to provide a
way to identify who's who in the Bluetooth world, and
specifically the companies supporting the development
of new Bluetooth LE Audio projects, and
even more specifically, Auracast.

32 Ultra-Low Latency Audio Transmission Over BT
Bluetooth LE Audio: Music To Performers' Ears!
By Jonny McClintock
This article explains how recent engineering efforts are
supporting musicians with cost effective, ultra-low latency
wireless connectivity, which will ultimately benefit the
performer's hearing.

Columns
Sound Control
48 Thin Sound Barriers
By Richard Honeycutt
Acoustical control in architectural spaces involves
reflection, absorption, diffusion, and insulation. When
sound impinges upon a barrier, all of these phenomena
occur differently, according to frequency, thickness,
and mass of materials. Can these principles be altered?

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