PTB – Physikalisch-Technische Bundesanstalt

SINOtec Stanac Helmholtz resonator made of closed-cell plastic

Audiences, seated audience on wooden chairs, approx. 1 person/m2

α per m² audience area

Audiences, seated audience on wooden chairs, ca. 2 pers/m²

α per m² audience area

Wedge-shaped, melamine foam, ceiling tile

SONAFLEX/SONAFLEX-GLASS sound-absorbing wall covering

Sonex Baffles 2-sided wedge-shaped melamine foam, hanging panels

Sonex Baffles wedge-shaped polyurethane foam panels

Sonex Contour wedge-shaped melamine foam ceiling tile

Mini-Sonex 200 wedge-shaped melamine foam panels

Sonex Hypalon wedge-shaped melamine foam panels

Wedge-shaped, melamine foam panels

Wedge-shaped polyurethane foam panels

Sonex Mini-Sonex 1 wedge-shaped melamine foam panel

Wedge-shaped, melamine foam, ceiling tile

Foam, Sonex, 4 inch thick on floor

Sonex foam, 2 inch thick on floor

Sonex foam panel, 3 inch (series 2)

Sonex Spectrum wedge-shaped melamine foam ceiling tile

Sonex Super-Sonex 1 wedge-shaped melamine foam panels

Sonex Trim melamine foam ceiling tile

Soning Barynal – 50 F 20 foam absorber

SONIT acoustical panel fabricated bonded sand particles

Sound Leca Super expanded clay cavity resonator

22 mm chipboard, 50 mm cavity filled with mineral wool

plywood (C)

Plywood panel, 3/8 inch

Plywood panel, 2 inch, glued to 2 1/2 inch thick plaster wall on metal lath

Plywood panel, 1/4 inch, mounted over 3 inch air space, with 1 inch glassfiber batts right behind the panel

Plywood panel, 6 mm, with 50 mm mineral fiber backing

Plywood panels

Plywood panels with mineral fiber filling on sub-frame

Plywood panels with mineral fiber backing

Plywood panels, cassette-pattern, with battening

Plywood-faced mineral fiber panel on sub-frame

Plywood paneling, 1 cm thick

Specially upholstered chair, occupied, vinyl cover, 2 cm back/4-6 cm seat upholstery

α per m² audience area

Specially upholstered chair, unoccupied

α per m² audience area

Specially upholstered chair, unoccupied, front side of seat back 65 %, 2 cm, rear side of seat back 0, top of seat bottom 4-6 cm, arm rests solid, upholstery cushion is covered with a vinyl sheet (series 2)

α per m² audience area

Specially upholstered chair, unoccupied, front side of seat back 65%, 2 cm, rear side of seat back 0, top of seat bottom 4-6 cm, arm rests solid, upholstery cushion is covered with a vinyl sheet (series 3)

α per m² audience area

Specially upholstered chair, unoccupied, front side of seat back 65%, 2 cm, rear side of seat back 0, top of seat bottom 4-6 cm, arm rests solid, upholstery cushion is covered with a vinyl sheet...

α per m² audience area

Specially upholstered chair, unoccupied, vinyl cover

α per m² audience area

Spincoustic blanket, 2 inch, covered with 3/16 inch perforated cement-asbestos board (Transite), 11% open areas

Spincoustic blanket, 2 inch, mounted against solid backing

Spincoustic blanket, 1 inch, mounted against solid backing

Spintone panels 180 Canyon

Spintone acoustic panels 360

Spintone panels Alpina Galaxie

Spintone panels Alpina