Virtual ALTI-EXPO 2021 will be held on    June 15, 2021. No charge to attend.

(This is just a “taste” of the full 2 day event to be held on October 24 & 25, 2021 in Orlando) 

Abstracts and links to register for each session may be found by scrolling down the page.

Multiphysics Simulation of a Low Frequency Horn Loudspeaker

By Alfred Svobodnik of Mvoid and J. Hipperson of Funktion-One

11AM ET June 15, 2021 60 minutes approx.

About FCS Technology: A Novel Electrodynamic Transducer Architecture 

By Benny Danovi- Resonado Labs

POSTPONED to Tuesday, June 22, 2021 at 1PM ET, Please register!

Loudspeaker Work-Bench Measurements

By Wolfgang Klippel and Simon Steiner of Klippel

3PM ET June 15, 2021 30 minutes approx.

Making Sense of All The Noise-ANC Headset Testing

By Jacob Soendergaard of HEAD acoustics

5PM ET June 15, 2021 60 minutes approx.

Abstracts and Bios

Multiphysics Simulation of a Low Frequency Horn Loudspeaker

A.J. Svobodnik (Mvoid Group), T. Nizzoli (Mvoid Group), P. Feurstein (Mvoid Group) and J. Hipperson (Funktion One)

This presentation gives insight into advanced modeling procedures for professional horn loaded bass loudspeakers. Milestones of the virtual development process will be explained:

            – CAD based geometry definition

            – Physics attributes of transducer and enclosure

            – Fully coupled multiphysical analysis

                        – Electromagnetics

                        – Structural dynamics

                        – Acoustics

            – Postprocessing

It will be shown that this approach will predict correctly a non-trivial design/geometry, purely from the geometry model, in the sense that it covers both resonant and horn loading effects.

A special focus will be on postprocessing following the paradigm of a virtual measurement resulting in high resolution directivity patterns for further analysis in array modeling and room acoustics predictions.

Eventually, validation of results by means of measurements will be shown.

Dr. Alfred J. Svobodnik is President & CEO of the Mvoid Group, specializing in providing consulting services and innovative technologies for Automotive, Consumer and Professional Audio as well as the developer of Mvoid® (Multidisciplinary virtually optimized industrial Design) methodology. Alfred is entrepreneur, thought leader, engineer and scientist. He has been researching for 30 years in the areas of Multiphysics and virtual as well as computational acoustics.

Prior to founding Mvoid in 2011, Alfred spent five years with Harman International Inc. where he held several senior managerial and executive advisor positions in the areas of simulation and virtual acoustics for audio systems. Alfred started his career as founding member, Executive Partner and CTO in 1990 with Numerical Analysis and Design, a company specialized in engineering analysis with finite and boundary elements for stress analysis, structural dynamics and computational acoustics.

In 1990 Alfred completed his doctorate at Vienna University of Technology with the degree “Doktor der Techn. Wissenschaften” (equivalent to PhD). The title of his dissertation is: „Numerical Treatment of Elastic Plastic Macromechanical Behavior of Longfiber Reinforced Metal Matrix Composites“. He also hold a university degree: “Diplom-Ingenieur” (equivalent to MSc) from Vienna University of Technology.

James Hipperson is an engineer at Funktion One Research Limited, focusing on electroacoustic design and measurement of innovative professional loudspeakers. His research interests include loudspeaker efficiency, horn and waveguide simulation and measurement/psychoacoustics of loudspeaker distortion and audio quality.

James graduated from the University of Salford with a First Class BEng in Audio Acoustics in 2017. A poster based on his final year project on modelling transmission line loudspeakers was awarded “Best Student Poster” at the 2017 AES UK Student Conference, and a paper presented at AES Milan 2018. Before his studies he worked as a live sound engineer.

James is a member of the Audio Engineering Society and the Institute of Acoustics (UK).

 

About FCS Technology: A Novel Electrodynamic Transducer Architecture 

By Benny Danovi – Resonado Labs 

For a century now, acoustic electrodynamic transducers have been bound by axisymmetric motor structures for high performance due to the assumption in transducer theory that the diaphragm moves pistonically for all operating frequencies. This is of course a flawed assumption, and results in much research and development being focused on the vibro-acoustic components of the driver to minimize cone breakup at higher frequencies. A new architecture for the electrodynamic motor has been developed which helps to address this inherent problem. Flat Core Speaker (FCS) technology presents an architecture that is a rearrangement of the conventional electrodynamic motor structure with a planar voice coil and bobbin assembly that is situated between two parallel bar magnets. This results in a high aspect ratio design where the bobbin runs along the length of a flat diaphragm, leading to even force distribution, and therefore pistonic movement, while utilizing a thin profile with a flat diaphragm. COMSOL simulations and Klippel measurement data support these claims and show evidence of FCS technology having comparable performance to conventional drivers in a slimmer profile and blowing conventional high aspect ratio driver performance out of the water.

Benny Danovi is VP of Engineering and Principal Transducer Engineer at Resonado Labs where he spearheads the expansion of the company’s proprietary Flat Core Speaker (FCS) technology transducer architecture. A highly experienced acoustic transducer engineer with nearly four decades in the industry, Danovi held previous roles at Pioneer and Harman, where he designed over 100 automotive OEM drivers under brands such as Bowers & Wilkins, Harman Kardon, JBL, Mark Levinson, and Revel, many with unique motor and suspension topologies. At Sonos, among other projects, Danovi was responsible for the woofer in the Gen 2 Play 1. Danovi also previously led OEM automotive transducer design at Alpine and worked on collaborations with brands such as McIntosh and Sonus faber.

Exhibitor Description

Resonado Labs is an American technology company that designs and licenses proprietary speaker driver technologies to brands and manufacturers. The company’s core pursuit is to develop speaker driver architecture that achieves optimal form and function, without compromise. Resonado Labs’ flagship product, Flat Core Speaker (FCS) technology, is the first manifestation of that pursuit. FCS technology is a novel electrodynamic speaker driver type engineered with a low depth structural profile and high diaphragm aspect ratio as an alternative to the conventional conical driver type to allow for innovative, space-efficient product designs without experiencing tradeoffs in sound performance. Resonado Labs was founded at the University of Notre Dame and is now headquartered in Chicago, Illinois.

Loudspeaker Work-Bench Measurements

By Wolfgang Klippel Simon Steiner of Klippel

Transducers are usually clamped in a relatively large baffle and measured under anechoic conditions to approximate perfect acoustical half-space conditions. A new acoustical near field method is presented that uses an extremely small ROUND baffle at least 10 cm around the transducer and can be operated in a normal office, workshop, or any other environment. Holographic post-processing removes the acoustical short-cut and baffle reflections and suppresses room modes and gives accurate data in the near and far-field. Exploiting the symmetry of the transducer reduces the measurement time to 5 minutes while providing full directivity information. The near field scanner is a small add-on to the KLIPPEL laser vibrometer using the same robotics. This seminar discusses important electrical, mechanical, and acoustical measurement performed on the SCN work-bench according to IEC 60268-21 and 22.

 

Making Sense of all the Noise – ANC Headset Testing

By Jacob Soendergaard- HEAD acoustics Telecom Account Manager 

How do we properly evaluate modern headphones and headsets? When looking for traditional headphones, consumers can read reviews online. In some cases, they can go to a store and try them on. An additional and more objective way is to look at frequency response measurements of headphones and headsets. But is this parameter sufficient to evaluate the performance of any audio device?

Many consumer headphones typically incorporate microphones (and could therefore be classified as headsets) and consequently take advantage of the microphone presence to:

  • Incorporate ANC
  • Include transparency (or talk-through mode)
  • Allow for voice calling (when connected to a mobile phone)

Evaluating those features is a challenging task for headset and headphone manufacturers. Only a very few companies have the capabilities to measure this. In cooperation with the Head-Fi.org team, we took the very best ANC headsets and put them through their paces. We wanted to test them and see how their performance stacked up in terms of those three parameters above.

Jacob Soendergaard is an Audio and Acoustics aficionado privileged to be employed in the industry. Receiving a B.Eng from Imperial College and MSc from University of Sussex, Jacob spent the following 7 years working for GRAS Sound & Vibration in a variety of technical and commercial roles focusing primarily on the Consumer Audio and Hearing Health industries. Since Jan 2016, Jacob transitioned to an Account Manager role with HEAD acoustics Inc working with consumer, business, and military customers on the goal of improving audio, voice and conversational quality in their products.

 

Author Contact info:

Jacob Soendergaard, Telecom Account Manager

HEAD acoustics, Inc.

O: 248 983 5991

C: 248 321 9075

E: jsoendergaard@headacoustics.com

6964 Kensington Road

Brighton, MI 48116

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