The New Concert Hall in Stavanger

Nytt konserthus i Stavanger
The New Concert Hall
in
Stavanger
Eckhard Kahle, Kahle Acoustics, kahle@kahle.be
Henrik Möller, Akukon, henrik.moller@akukon.fi
Tønnes A. Ognedal, Sinus, t.ognedal@sinusas.no
Noise from outdoor sources
• Ships are the major noise source
• Vibrations taken care of by separated strucutres
• Noise reduction depening on location
Requirements and Solutions
• Noise limit for Fartein Valen: 15 dBA
• Administratively avoid most noisy boats
– Boats Lw > 110 dBA to be placed elsewhere
• Accept horns (Lw
= 140 -160 dBA)
– used mainly outside concert hours
• Double sound insulating structure:
– Two concrete walls – large cavity – vibr. isol.
– Heavy roof, suspended ceiling with large cavity
Sound insulation between halls
• Structural split between building bodies
– No common fundation
– Air gaps prefered
– Rockwool and elastic seals allowed in places
• Additional 18 dB joint around each hall
– Elastic rubber/steel connectors (dybel)
– Rockwool and elastic seals in joints
• Technical installations crossings minimized
• Specifications made for
acoustic and fire sealing
Acoustic separation from the bottom:
Checking strutures before and after concrete is filled
Testing and repairing acoustic separation
Controlled hammering pluss
measurements of vibrations
several times during the
building process.
Technical installations across acoustic split
Example: elastic cable tray support
Before the first test concerts with both halls:
Closing several doors & Sealing leaks.
A rock concerts in Zetlitz
is not audible in Fartein Valen!
LpAF,max < 15 dB ?
LpAF,max = 105 – 110 dB
Noise sources in Fartein Valen
• Very strict requirement set for every source.
• Example test of floor diffusors:
Lw,A = 5 dB corresponds to Lp,A (1m) = - 3 dBA 
Aspiration smoke detectors
• Enclosures required
Spiral stairs above ceiling
stabilization required
Noise towards neighbours
• Double doors in facade:
Foyer:
Reverberation times
Concert Hall
Brief and main design goals:
• 1500-seat classical Concert Hall
• Shoebox shape
• Optimized for moderate-size symphony
orchestra
• Large-scale symphonic works are
exceptional but need to be possible with
good acoustic conditions
• Recitals, chamber music and chamber
orchestras are an important part of the
programme
2 volume change options proposed in brief:
• Reverberation chambers
• Movable ceiling
•
Movable ceiling was retained, prior to
start of acoustic design, reverberation
chambers excluded as being too
expensive
Design Concept Concert Hall
Floating Side Balconies
Signature of inner and outer room
Design Concept – Long Section
Intimacy – acoustical and visual
Acoustic Measurements
Opening Week (1)
Opening Week (2)
Opening Week (3)
Multipurpose auditorium
•
Described in the program as:
– The multipurpose auditorium shall
mostly be used for performances
using electro-acoustics, and shall be
highly flexible. The auditorium shall
have a reverberation time
changeable between ca 0,8 and 1,4
sec for the midfrequencies (5001000Hz), the changes shall be
performed with the use of banners
or elements with one absorbing,
one reflecting surface. These will
give changes in reverberation for
treble/mid-frequencies. To handle
the need for the large changes of
the reverbeation time, we must, as
a compromise, include a certain
amount of permanent bass
absorbers»
Multipurpose hall
•
Main configurations:
– ”theatre/show”
• Fixed seats, telescope
• Orchestra pit lift lower to make a ”stage
front”
– ”music theatre”
• Fixed seats, telescope
• Pit open
• First row of seats same height as stage
– ”rock”
• Flat floor
• Band on raised stage in back-stage area.
Multipurpose hall
•
Variability
– Seating
• Parterre seating telescopes and on lifts.
Can be removed totally
– Curtains in auditorium
• Transverse curtains behind technical
bridges.
• Roller curtains on side walls
• Manual curtains above the grid, on all
walls
– Stage curtains
• Two sets, one more reflective, on
absorptive
•
Fixed absorption
– Ceiling above grid
– Side and rear stage ceiling
– Side and rear stage wall surfaces
– Other surfaces ”optimized” for bass
absorption
Multipurpose hall
•
Acoustic criteria
– Full measurements has not yet been done
– Initial measurements indicate that minimum
RT is around 0,8 s@mid but maximum is
about 1,2 s@mid, in other words a little less
than the requirements
– Extra fixed absorption was added in the
stage area.
– Some extra curtains in the auditorium has
been suggested.
Part 2: Visit of the rooms
We shall stop Powerpoint
presentations here and now
invite you for a tour of the
building including both rooms
and the acoustic joint.
Come and join us!