19 th international congress on acoustics madrid, 2-7 september 2007



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Two new solutions for adjustable acousti



19
th
 INTERNATIONAL CONGRESS ON ACOUSTICS 
MADRID, 2-7 SEPTEMBER 2007 

 
TWO NEW SOLUTIONS FOR ADJUSTABLE ACOUSTICS
IN MULTI PURPOSE CONCERT HALLS
 
 
PACS: 
43.55.Fw
Agren, Anders
Div of Sound & vibration, Lulea University of Technology, 97187 Lulea, Sweden, 
anders.agren@ltu.se 
 
ABSTRACT 
In the Swedish cities Lulea and Pitea two new multi purpose halls for classic concerts and 
amplified popular music, are being built. The sizes are around 650-950 seats. Both halls have 
been designed for adjustable reverberation time from 1,1 to 1,8 seconds. Two completely 
different solutions where chosen. The Lulea hall has a combination of solutions; adjustable wall 
absorbers, curtains and adjustable absorbing ceiling boxes. The new wall absorber construction 
is covering the side walls and comprises two panels with slots in front of each other and 
absorbers behind. One panel is driven by electric motors so that the slots are combined into 
openings or as closed panels. On the panels there are studs that act both as diffusors and as 
stiffeners to reduce low frequency losses. Measurements of absorption in lab and T
60
in situ are 
presented, as well as analyses of the acoustic qualities. The Pitea hall is under construction and 
will have a completely different solution. The inner ceiling is constructed as five stiffened panels 
that can be lowered by a large number of chain hosts, thus reducing the reverberation volume 
by 30%.
BACKGROUND 
Two new concert halls have been designed. Both of them have been acoustically projected and 
modelled by Tunemalm Akustik. The Pitea Hall has been designed by Monarken Architects and 
the Lulea House of Culture has been designed by Tirse´n & Aili Architects. Also, Lulea 
University of technology has been involved in some acoustical and construction matters. Both 
halls have been designed for a wide range of uses, from symphony orchestras to electrified 
music and conferences. The halls are designed to have space for 650 – 950 persons and
reverberation times between approximately 1.1 to 1.8 seconds. The shape of the two halls is 
both nearly rectangular, with non parallel walls. Both halls where modelled with CATT Acoustics 
modelling software. 

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