|PC Sound & Acoustics
Live Sound Solutions - Acoustic Consultancy & Engineering
|Professional Experience - Loudspeaker Product Development
Before the development phase of any loudspeaker product there is a period of concept development. This period includes close cooperation with the designer and
a concept team, tailoring the concept until the right product is born. The roll of the acoustic engineer is to verify and evaluate potential solutions and often develop
new technologies and ideas in order to solve a particular problem, such as very limited space. This process teaches you to keep a very open mind and I have
never had the simple task, as many have, of simply choosing rectangular box dimensions for a loudspeaker (except for custom PA boxes).
The first commercially available loudspeaker for which I was responsible for the complete acoustic design and performance was the Beolab 1 loudspeaker.
Released in 1999, it has sold in over 15000 pairs and received very good reviews in the Hi-Fi press. Since then, I have worked on numerous concepts and the
development of some fantastic loudspeakers, including a professional studio monitor for near-field monitoring. This monitor was built around a concept and has a
rather unusual but very practical design. The loudspeaker is a 2 or 3-way modular active loudspeaker with an acoustic lens and provides unrivalled imaging and
sound performance. The system was tested over a lengthy period by artists such as Erann DD and Jean Michel Jarre and at Plant Studios in California. George
Massenburg also had a set on loan - he was quite reluctant to give the speakers back. Weislaw Woszczyk at McGill University in Canada was also involved in
testing. Later I developed the Beolab 7-1 loudspeaker which has been available since December 2004. It is a stereo 3-way active loudspeaker for the latest
Beovision LCD and plasma displays from Bang & Olufsen. It offered, without doubt, the best television sound on the market at that time.
A very important roll of the loudspeaker engineer is the ability to move the product from prototype assembly to large scale production. For me, this work has
included the design and specification of state of the art test equipment including test boxes for level adjustment (for drive unit sensitivity differences, including
compensation for atmospheric temperature and pressure variations), frequency range measurements and rub and buzz and air leak measurement and failure
registration. This area also includes detailed tolerance chain analysis and general quality control of drive units.
Furthermore, I have been responsible for technical documentation regarding the products I have been responsible for, such as technical input for user manuals
and service documentation. I have also taken part in training seminars for service personnel, technical assistants and dealers, both in Denmark and in the US,
where I was involved with teaching a basic understanding of sound and acoustics to staff as part of a larger training programme.
I have used the following tools for loudspeaker development: measuring equipment including Bruel & Kjær 2012 and 2144 analysers, assorted B&K microphones
and pre-amplifiers including the Nexus range, the Klippel R&D measurement system, Audiocore software and the DP226 digital equalisers, Yamaha and MIDAS
digital mixing consoles, Cooledit, TrueRTA room measuring equipment, MLSSA, custom Matlab measuring equipment combined with a 12x12x13m measuring
chamber, also near-field, 2pi, free-field and anechoic measuring techniques, various personal MathCad programs, and AudioMulch software.
A large area of loudspeaker development is understanding listening room acoustics and how loudspeakers interact with the room. I have experience of designing
listening rooms to IEC standards and correction of existing rooms. On the more practical side, I am not afraid to get a soldering iron going and I have taken care of
the complete control room installation for several IEC-standard listening rooms. Some of the products I have developed for B&O are shown below:
|A passion about sound since my early teens led me to study Electroacoustics at the University of Salford in England. Since completing this four year degree in
1996, I have worked full time with acoustics and particularly R&D of loudspeaker systems for Bang & Olufsen and Harman Professional Denmark. I have also 25
years experience as a live sound engineer and providing acoustics consultancy for product development, installs, studio design, building and room acoustics and
tuning services for existing and new audio systems. I am now self employed and my company PC Sound & Acoustics specializes in live sound solutions,
acoustical measurement and treatment of listening spaces, acoustic consultancy and loudspeaker system engineering. I own professional sound system
equipment to support concerts from intimate events with 80 to 100 people in the audience to larger indoor or outdoor venues up to approximately 500 people. I
have great experience in small to medium venues and particularly church spaces - from rock and popular music to world class jazz, opera and gospel.
|Clockwise from top left: Beolab 1 (analogue
3-way speaker), Beovision 7 with Beolab 7-4
(analogue stereo 3-way speaker), Beolab 5
(digital 4-way speaker), Beolab 7-4 centre
loudspeaker (analogue 2-way speaker) and
Beolab 9 (analogue 3-way speaker).
Below: a unique modular near-field studio
monitor concept with very constant horizontal
directivity. Unfortunately this never went to
market due to price and market volumes.
|My company is registered in Denmark with the Central Company Register (CVR) number 38996738. Read on for more information about who I
have worked with and my engineering background. See also updates on my company Facebook page here.
|Above and left - some components integral
to Bang & Olufsen automotive sound
systems of which I have been responsible
for the acoustic design including the acoustic
lens for the tweeter on the dashboard in the
latest Audi A8 and grilles in aluminium from
the Bentley Continental and Flying Spur and
from the Lamborghini Urus left.
Below, from the Consumer Electronics Show
in Las Vegas in 2019 with a Lincoln
Navigator equipped with sound zones for six
passengers, low frequency control of the
sound field and other features.
|Examples of acoustic treatment of rooms to improve the
reverberation time and thus the acoustic properties of the rooms.
Here at Sound Hub Denmark in Struer with products from Norto
who are based in Vinderup, Denmark.
Treatment is based on absorption data for the individual types of
treatment. Measurements of absorption data is performed
according to DS/ISO standards in a reverberation chamber as
PC Sound & Acoustics has performed measurements and
provided data for all of Norto's portfolio of products. It is also
possible to have measurements performed in you hose, should
you have problems with acoustics.
|Two pictures of live-streaming events - a live concert with "Jazz n Grundtvig" and an AGM under Corona in the spring of 2020.
|Here two examples from "Picnic in the Park" summer 2020 at Høloftet, Thyholm with Poul Krebs and band. PC Sound supplied all light and sound.