AES Member Profile

Rosalfonso Bortoni

Rosalfonso Bortoni

Job Title:

Primary Section:

Company Website:
Facebook Address:
LinkedIn Address:

Audio Fields:

  • Product Design & Manufacturing - Research & Development
  • Recording Industry - Home/Project Studio
  • Live Sound - Public Address
  • Acoustics, Psychoacoustics, Hearing - Measurement and Instrumentation
  • Acoustics, Psychoacoustics, Hearing - Musical Acoustics
  • Product Design & Manufacturing - Hardware
  • Product Design & Manufacturing - Transducers
  • Product Design & Manufacturing - Semiconductors
  • Educational Institutions - Educator

Job Duty:

  • Owner/Director


I was born in São Lourenço, Minas Gerais (MG) state, Brazil, in 1965. Son of musician parents, I started in music at the age of 6 studying piano. In the 1970's, fascinated with the sound of the Progressive Rock, I chose the electric guitar as my primary instrument. My interest in electronics arose with the discovery of synthesizers and that naturally led me to the Audio world.

I graduated as an electronics technician (1985) from the Technical School of Electronics "FMC", in Santa Rida do Sacucaí, MG, and studied Jazz techniques (1986 to 1988) at CLAM - Free Music Learning Center, in São Paulo, music school run by the Zimbo Trio. During this period, I developed my first audio equipment, joined several rock bands and performed as a professional musician.

I graduated in electrical engineering (emphasis in electronics and telecommunication) at INATEL - National Institute of Telecommunication, Santa Rita do Sapucaí (1993) and, by the end of the course, I was already manufacturing an amplifier for instruments and a Thiele-Small analyzer with my first company, R.B. Eletrônica. I continued developing and designing power amplifiers, dynamic processors (VCA-based,) and loudspeakers for the Brazilian audio market during the following years. That was the period when I joined the Audio Engineering Society as a student member (1992.)

In 1997 I started my master's degree at UFSC — Federal University of Santa Catarina, where I developed my work on class A, B, AB, G and H power amplifier output stages assessment. In the same period, I held several work shops throughout Brazil demonstrating the fascinating relationship between power amplifiers and loudspeakers (1998 to 2002). In 2002 I published the book "Audio Amplifiers -- Fundamentals, Characteristics and Applications," wrote and published several technical articles in specialized audio magazines, and was the secretary of the AES Brazil section. My continued research resulted in my doctorate's degree focused on the behavior of loudspeakers driven by current sources (2005), which also led me to represent, distribute, and support the Klippel Analyzer System in Brazil (2004). The results of these works were partially presented at the AES conventions in Amsterdam (2001), New York (2003), San Francisco (2004,) and Vienna (2007), and also published in the JAES - Journal of the Audio Engineering Society (2002). During the same period I designed and manufactured dynamic processors, power amplifiers and powered loudspeakers that were commercialized in the Brazilian market by Biquad Tecnologia, Studio R, FZ Audio and Clever Tecnologia (2000-2005).

In 2005 I moved to the United States (USA) to join THAT Corporation's team. I worked directly with the development, manufacturing and applications of high performance audio integrated circuits, such as VCAs, microphone preamplifiers, line receivers, line drivers, analog engines, among others, and giving technical support in the development of audio products for companies worldwide (2005-2011). I also gave presentations and workshops at the AES conventions, highlighting the paper The 48 Volt Phantom Menace Returns (2009), also published in the JAES (2010). In the same period I did specializations in low-power and low-noise analog integrated circuits at EPFL — Ecole politechnique fédérale de Lausanne (2006) and at MIT -- Massachusetts Institute of Technology (2008). On personal projects, I performed as the lead guitar with the Insanity Suite fusion-style trio (2009-2010) and with the Lee Villaire Band (2011), participating in the recording of her 6th album Victory Dance released in 2014. I also participated in Olympic-distances triathlon competitions.

Back in Brazil in 2012, I joined UFSC - Federal University of Santa Catarina, for a postdoctoral in analog integrated circuits and was a consultant for Audio Precision (USA) providing application support and training on their audio analyzers in Brazil. In 2013 I joined the Organizing Committee for the Rio 2016™ Olympic and Paralympic Games as the Audio and Video Manager, where I was responsible for all sound systems (FOH and BOH) and intercom systems of the 39 (thirty-nine) competition venues, including all simultaneous interpretation systems to support press conferences. I was also the technical responsible for the scope of the audio, video, intercom and data communication network, and also co-participated in the development and design of the video systems and sports production in all arenas (2013-2016). After all, I then presented a tutorial on the planning and deployment of this project at the AES convention in Berlin (2017). I did a specialization in Sports Administration at International Olympic Committee & Brazilian Olympic Institute, Rio de Janeiro (2014) and I also graduated on Business Administration (MBA) from Fundação Getúlio Vargas, Rio de Janeiro (2015.)

Following the project of the Rio 2016 Olympics and Paralympic Games, in 2017 I founded Bortoni Technology, a company dedicated on providing solutions of excellence in audio, combining art and science in product development, services and training in electronics, acoustics and electro-acoustics. Since 2017 I have been contributing in the academic environment with both Federal University and Federal Institute of Santa Catarina (UFSC and IFSC), collaborating in audio-related disciplines and co-supervising under graduation projects.

Education Background

B.Eng., M.Sc., and D.Sc. in electrical/electronics engineering, and MBA.

Employment History

Bortoni Technology (2017-now)
Rio 2016™ Olympic and Paralympic Games (2013-2016)
Audio Precision (2012)
THAT Corporation (2005-2012)
Audio consultant and entrepreneur (1990-now)

Related Experience

Musician; audio electronics, electroacoustic, and systems designs; project, product, and production management; teaching, and R&D. Visit

Why Am I An AES Member?

Because it is an audio community where I can be in contact and talk with the most talented and notorious fellows.


SC 401, km 01, No. 600
ParqTec Alfa - CELTA
88030-902 Florianópolis Santa Catarina
Office Phone:

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