evoke – new technology for variable acoustics

video   Short video presentation (1:23 min)

video   Real-life installation (0:22 min -remember sound ON)

New possibilities in music hall design

Multipurpose halls can now present any style of music with literally optimal acoustics. This has become possible through the introduction in 2018 of the evoke technology.

The evoke is by far the most powerful variable acoustics technology. It completely transforms a hall acoustically
in a matter of seconds – with no visual change to be seen!

A music hall can now present anything from choir, chamber music over brass bands to rock concerts and even cinema
– all with optimal reverberation time and thereby sound.

The system consists of numerous modules that are embedded in large, or entire ceiling and wall surfaces.

Each module has a dedicated low voltage motor and can be:

  • open to absorb sound = short reverberation
  • closed to reflect sound = long reverberation

These variable modules are connected in groups – for instance 4 groups. There is one group (preset) for each basic style of music to be presented. However, there is no limit to the amount of groups that can be allocated a system. Each single module could be operated individually.

Panels of any  surface finish, such as wood, can be mounted flush to the variable modules. This should render a relatively high degree of design freedom for architects.

 Certified measurements in reverberation chamber

 Read brochure

The technology was developped with Innovation Fund Denmark (Danish Ministry of Higher Education and Science) and is patented.

The variable modules can be angled to obtain a more sound-diffused room. The surface panels can have various perforation patterns chosen by acoustical consultants and architects with for instance smaller slit-widths than the width of the openings in the variable modules – or be sound diffusive.

Walls and ceiling, or parts of them, become fully absorptive or reflective, at the flick of a switch.

The evoke system can come with an optional service package which ensures a lifespan of at least for instance 40 years.

video  Explanatory video (4:30 min)

“The name ‘evoke’ was chosen since, to the best of my knowledge, the technology really helps the performing musicians to evoke music – regardless of genre. The absorption curve is chosen very deliberately.

It is well known that amplified music needs a controlled bass reveberation but maybe less commonly appreciated, that the hall shouldn’t be irresponsive at high frequencies. This is substantiated in my latest peer reviewed article: Investigation on acceptable reverberation time at various frequency bands in halls that present amplified music.

Please read more in the section: acoustical/research papers.”

Kind regards
Niels Adelman-Larsen, musician, acoustician