PRODUCT INFORMATION TROLDTEKT SPEAKERS
Troldtekt speakers 速
Troldtekt® speakers – integrated sound Troldtekt speakers are integrated and concealed in the Troldtekt ceiling. No visible cabinet speakers or wires, rather architectural purity and clear lines. Troldtekt speakers are based on modern technology ensuring top-quality sound reproduction. At the same time, the Troldtekt panels provide optimum acoustics in the room, distributing the sound clearly and comprehensibly without any disturbing reverberation.
Troldtekt speakers.............................................................. 2 Technology background................................................. 3 Good sound coverage
Dimensions........................................................................... 4-5 Speakers Subwoofers
Case studies..........................................................................6-7 Harbour House Gammel Rye parish community centre
Service............................................................................................. 8 About us........................................................................................ 8
Published by: Troldtekt A/S 2013 Photos: Thomas Mølvig and Martin Tørsleff Design: www.ineo.dk Text: www.publico.dk, www.pressential.co.uk
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This is an elegant and discreet sound experience for office environments, cafés and theatres, railway stations and airports – and, of course, for your living room. Read more about Troldtekt speakers on the following pages and take inspiration from the two case studies – the office building Harbour House designed by Kim Utzon and the Gammel Rye parish community centre designed by CUBO. Enjoy!
Technology background Troldtekt speakers are integrated in Troldtekt acoustic panels, so you will not notice the speakers in the ceiling – but you will hear them. A Troldtekt speaker is a Troldtekt acoustic panel with a specially developed NXT panel integrated and concealed in the actual Troldtekt panel. An NXT panel electrical impulses into vibrations which are in turn transformed into sound waves. The sound waves pass through the Troldtekt panel and are distributed throughout the room.
On the back of the NXT panel is a flat cassette which protects it against dust, impacts, gnawing mice and other threats.
is a complete flat speaker unit which transforms
Troldtekt speakers can be connected to regular amplifier equipment with radio, CD, iPod or mixer/microphone systems. To ensure optimum sound reproduction in the > bass spectrum, we have developed a special subwoofer. The low subwoofer height of only 13 cm (+ 5 cm for connection cables) enables placing of the subwoofer above the ceiling panel or e.g. under a sofa.
GOOD SOUND COVERAGE It is important for good sound experience that the
tire ceiling surface, which ensures sound signals of
sound reaches every corner of the room. In traditional
uniform volume throughout the room. Traditional cabi-
speaker systems, the sound is emitted from a few
net speakers often offer directional characteristics of 75˚ 75˚
points, often resulting in the experience that the sound
approximately 75 degrees whereas the speaker panels
pressure is high and close to the speakers but then
in a Troldtekt acoustic ceiling have directional charac-
quickly subsides to become weak in the most remote
teristics exceeding 170 degrees. This ensures that the
corners. In other words, the sound is unevenly distri
sound signal from the acoustic panels is evenly distrib-
buted throughout the room. For example, this situation
uted across the entire ceiling surface and always within
is familiar in airport terminals and railway stations,
hearing range. This also means that the sound pressure
where you need to be close to the speakers to be able
may be generally lower than in traditional systems
to understand any messages.
where it may be necessary to turn the volume up especially loud to make sure that the signals reach every
In a Troldtekt acoustic ceiling with integrated speakers,
the speaker panels are evenly distributed over the en-
TROLDTEKT SPEAKERS > 3
Dimensions To achieve an optimum sound experience in a room, it is important for speaker units and subwoofers, if any, to be dimensioned correctly in relation to the room in question.
DIMENSIONING – SPEAKERS Several factors affect the sound experience in a room
2.5 m, it may be necessary to increase the number of
and must be taken into consideration when calculating
speaker panels to ensure good sound pressure distri-
the quantity and distribution of speaker panels in the
bution, while at ceiling heights above 8 m, it may be
ceiling, to ensure as uniform a sound pressure as possi-
necessary to increase the number of speaker panels. In
ble. Troldtekt will be happy to provide advice on dimen-
situations with smaller requirements for sound pres-
sioning of speaker units and to carry out measure-
sure distribution or speech intelligibility, the number of
ments for project planners.
speaker panels can be reduced.
Some of the factors affecting dimensioning are:
Speech intelligibility and sound pressure distribution
The longer the reverberation time in the room, the
Room geometry, particularly the ceiling height
fewer speaker panels are required to ensure a suffi-
Room reverberation time
cient sound pressure. However, a longer reverberation
time will reduce the speech intelligibility so you should therefore strive to reduce the reverberation time below
Speech intelligibility and sound pressure
0.6-0.9 seconds, depending on the nature of the job.
The Troldtekt ceiling has high sound absorption and
A high level of speech intelligibility requires a good
efficiently reduces the reverberation time in the room.
sound system and good room acoustics with a low reverberation time. A Troldtekt acoustic ceiling ensures optimum sound
Background noise For PA systems in particular, it is important that the
absorption with a low reverberation time in the room.
sound system signal is clearly differentiated from the
Furthermore, the NXT technology ensures that speech
background noise. One way of obtaining this is to
emitted from the speaker panels is perceived clearly
ensure a sufficiently high sound pressure to drown out
background noise. Alternatively, you can ensure that the sound is evenly distributed throughout the room
so that disturbing background noise does not act as a
At ceiling heights from 2.5 - 8 m, it would be sufficient
barrier between the sound source and the listener.
to have one speaker panel approximately every 30 sq m to ensure optimum speech intelligibility and good sound pressure distribution. At ceiling heights below
> 4 > TROLDTEKT SPEAKERS
Speakers as decoration Troldtekt speakers can also be combined with Troldtekt decoration and are then delivered as framed wall panels.
At ceiling heights from 2.5-8 m, it would be sufficient with one speaker panel approximately every 30 sq m to ensure optimum speech intelligibility and good sound pressure distribution.
DIMENSIONING – SUBWOOFERS
Sound pressure and dB
Sound pressure is the generally used method for measuring the power of sound volume. The range perceivable by the human ear – from weak to powerful sound pressure – is enormous, which is why the decibel scale (dB) is typically used. 0 dB is the weakest sound perceivable by the ear, while the most powerful sounds register around 120-130 dB.
The reverberation time is an expression indicating how fast sound dies away in a room, e.g. clapping your hands. Specifically, it is the time (in seconds) that passes from the end of the sound impulse until the sound level has dropped by 60 dB.
Speech intelligibility indicates how well speech is perceived in a room – either directly in the room with a speaker and a number of listeners, or via a sound system with a microphone, amplifier and speakers. In its classic form, speech intelligibility is measured by counting how many words are correctly perceived from a text read by an articulate speaker. If the listeners perceive 60% of the words correctly on average, the speech intelligibility is 60% or 0.6.
Subwoofers ensure optimum reproduction of the low bass frequencies below 200 Hz. For systems designed to play music, it is important for achieving good sound that the quantity of subwoofers is correct. Normally, one subwoofer should be provided every 60-120 sq m. As directional determination of the low bass frequencies is difficult, the requirements for even distribution of the speaker panels does not apply to subwoofers. For PA systems, which do not require the same bass volume as music systems, the number of subwoofers can be reduced – or possibly be eliminated entirely.
In our library at www.troldtekt.com, you can find installation instructions for Troldtekt speakers, and also installation instructions for the various types of Troldtekt ceilings.
TROLDTEKT SPEAKERS > 5
One of the major construction challenges today is to make good acoustics, architecture and aesthetics come together in synergy. Troldtekt acoustic panels with integrated, concealed speakers ensure good acoustics and good sound reproduction while presenting the ceiling as a clean, unbroken surface. In our inspirational section at www.troldtekt.com, you can find a number of exciting case studies and pictures – here are a few examples:
Client: Harbour House A/S Architect: Kim Utzon Architects Engineer: Wessberg A/S
Harbour House Open arms at the port Prime location and architecture characterises Harbour House, headquarters for three shipping companies. The building forms part of the ‘Nolli’ series, designed by Kim Utzon. The U-shaped Harbour House
building’s overall expression. The sound is just there
opens its arms towards the
and there is no visible equipment to disrupt the simple
water. The 8,600 sq m struc-
look of the ceilings”, says Kim Utzon.
ture is one of the long list of
The architect’s own offices are also on the water-
buildings designed by architect
front, at Nordre Toldbod, where he has created an
MAA Kim Utzon. Many of these
inspiring base for his staff of 14.
are located on Copenhagen’s waterfront but Utzon’s touch is also strongly evident in Helsingborg, Sweden
Troldtekt in the signature
and Aalborg, Denmark. Harbour House is the joint
Kim Utzon’s buildings are characterised by a clear choice
headquarters of three shipping companies and the
of simple materials that harmonise perfectly with the
house activities are therefore highly port-related.
overall architectural design. The supporting structures
With so many offices and such intense meeting activity,
are often visible concrete elements – columns, beams
the acoustic environment plays a significant role in the
and T-panels – combining to create a flexible and
building, which is why Troldtekt has been used to
extendable building system that has proved suitable
dampen sound in most rooms.
in many situations. Kim Utzon has also chosen to use cement-bonded wood wool in many of his buildings,
A series of new features
making Troldtekt an important element in his architec-
To ensure good sound and distribution allowing every-
one to hear the speaker, the conference rooms are fitted with concealed Troldtekt speakers. „We used several new features in Harbour House, For one thing, we used integrated, concealed speakers in the Troldtekt ceilings, which fit in nicely with the
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Harbour House is the fifth element in the series that Kim Utzon has dubbed ‘Nolli’. This structure forms an urban whole inspired by Giambattista Nolli, who charted Rome around 1750.
Gammel Rye parish community centre Multi-purpose room with sound in every corner The new parish community centre in Gammel Rye, Denmark, is rooted in history and the Troldtekt ceilings fit in well with the building’s rustic character. Acoustic ceilings with integrated, concealed speakers ensure good acoustics and good sound reproduction in the confirmation candidate schoolroom, which also serves many other purposes. Saint Soren’s parish com-
best acoustic panel and the sound properties of
munity centre is located
Troldtekt are well suited for a multi-purpose room
next to Gammel Rye church
such as this”, says architect MAA Anders Kærsgaard
– a beautiful and elevated
from the Årstiderne Arkitekter architectural firm.
location in the Central Jutland Lake District. Whereas
Rustic expression with concealed sound
the church itself dates back
To provide the best possible sound experience in the
to the 15th century and the
large room, four speakers are integrated in the ceiling
brick tower was erected in 1912, the parish community
panels. This conceals the speakers and the sound pass-
centre is newly built. The house was designed by the
es through the Troldtekt panels on its way into the
architectural firm Årstiderne Arkitekter A/S with great
room. This allows the sound to be distributed to every
reverence for the history of this location but also with
corner of the room without the speakers being visually
a present-day twist to show that we are now in the
The lobby and administration office also have Troldtekt ceilings and a solution with integrated lighting
Multi-purpose room The most important room in the parish community
in the panels has been selected for this area. „Troldtekt is a rustic material and is therefore a
centre is the confirmation candidate schoolroom which
perfect match for the white-washed walls, the laminat-
fits well in the entire structure with its large corner
ed wood beams and the wide floorboards. The church
window facing the church. The room is used for teach-
council was not easily persuaded because cement-
ing, lectures, choir singing and other activities.
bonded wood wool has a history of use for ceilings
„Naturally, this places considerable demands on the
in livestock buildings. However, now that the building
acoustics in the high-ceilinged room. We therefore
is finished, the logic is clear to them and they are very
chose Troldtekt, because in our experience this is the
satisfied with the project”, adds Anders Kærsgaard.
Client: Gammel Rye church council Architect: Årstiderne Arkitekter A/S Engineer: Søren Jensen A/S
TROLDTEKT SPEAKERS > 7
Service www.troldtekt.com provides a clear overview of the
many Troldtekt acoustic solutions. Using our product
We are happy to provide technical advice for construction
generator, you can also download accompanying
professionals. We provide advice on Troldtekt acoustic
AutoCad drawings, a description of the product range
solutions and associated products, including the dimen
and detailed installation instructions for the chosen
sioning of Troldtekt speakers and we also carry out light
solution. The website also contains lots of inspiration,
and sound calculations for project planners.
among other things a number of reference pictures, case studies and articles about trends.
About us Troldtekt A/S has produced Troldtekt acoustic ceiling
The result is a range of products which are tested
and wall panels since 1935 at Troldhede in central
to meet today’s ever increasing demands for good
Denmark. During this time, the product has undergone
acoustics in a wide variety of buildings.
continuous development and refinement.
International distributors Details of our international distributors are available on
our distributors for general information, brochures
www.troldtekt.com. They either stock our Troldtekt
or data sheets. You are, of course, also welcome to
products or can obtain them for you. Please contact
contact Export sales at our Head Office in Denmark.
Troldtekt A/S Sletvej 2A 8310 Tranbjerg J Denmark Tel: + 45 8747 8100 Fax: + 45 8747 8111 Email: firstname.lastname@example.org www.troldtekt.com