PTB – Physikalisch-Technische Bundesanstalt

Spintone panels Cristal Galaxie

Spintone Cristal mineral fiber panels

Spintone panels Etolies

Spintone panels Residence

Spintone panels Strial

Stankiewicz Barynal 30 F 20 foam absorber

Stankiewicz Laysa – 18 sound absorption mat

Stankiewicz Laysa – Dekor sound absorption mat

Stankiewicz Laysa 12 polyethylene foam mat

Stankiewicz Laysa Phon sk composite mat

Stark Ceramics Sto acoustic plaster

Heavily upholstered chair, occupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Edmonton, Jubilee Hall

α per m² audience area

Heavily upholstered chair, occupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, average from smoothed curve (series 2)

α per m² audience area

Heavily upholstered chair, occupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Salzburg, Festspielhaus (series 3)

α per m² audience area

Heavily upholstered chair, occupied, seat back 7.5 cm, seat bottom 10 cm, arm rests 2 cm, Kanagawa (series 4)

α per m² audience area

Heavily upholstered chair, occupied (Rotterdam, De Doelen) (series 5)

α per m² audience area

Heavily upholstered chair, occupied, front side of seat back 7.5 cm, average (series 6)

α per m² audience area

Heavily upholstered chair, occupied (N.Y., Philharmonic Hall)

α per m² audience area

Heavily upholstered chair, occupied, Berlin Philharmonie

α per m² audience area

Heavily upholstered chair, unoccupied

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Berlin, Philharmonie

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Rotterdam, De Doelen (series 2)

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Cleveland, Severance Hall (series 3)

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, average from smoothed curve (series 4)

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Edmonton, Jubilee Hall (series 5)

α per m² audience area

Heavily upholstered chair, unoccupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, average (series 6)

α per m² audience area

Heavily upholstered chair, unoccupied (Salzburg, Festspielhaus)

α per m² audience area

Heavily upholstered chair, occupied, front side of seat back 7.5 cm, rear side of seat back sometimes, top of seat bottom 10 cm, arm rests 2 cm, Cleveland, Severance Hall

α per m² audience area

Walls, strongly vibrating walls (e.g. wooden paneling over air space)

Starkustic structural clay hollow tile with perforated ceramic facing

Steeltone Venables (steel staves)

partition cm 8x25x25 10 holes F/A=60% without whitewash 4 day old

partition cm 8x25x25 10 holes F/A=60% with whitewash e trace

Brick material with various perforation ratios (45%, 32%)

Rockwool blanket, 4 inch thick batt (Full-Thick), covered with 3/16 inch thick perforated cement asbestos board (Transite), 11% open area, mounted over 2 inch air space

Rockwool blanket, 2 inch thick batt, 3/16 inch perforated Transite board, 11% open area (series 2)

Stone wool panel, 50 mm, 80 kg/m³

RockWool thickness=50 mm d=110 kg/m³ (series 2)

Rockwool panel, thickness 50 mm, density 40 kg/m³ (series 3)

Rockwool, thickness 50 mm, 70 kg/m³ (series 4)

Sto acoustic spray plaster, Euroclass A2

Sto Classic Nubby prefinished lay-in board

Sto-Knauf Acoustic Element Ceiling D 125

StoSilent Panel 2000 acoustic panel with expanded glass granulate

stucco tiles (g)

Studio curtain, 220 mm wall distance

Chairs

α per m² audience area

Chairs, medium upholstered concert hall chairs, average

α per m² audience area