pyroomacoustics.materials.database.rst

Materials Database

Absorption Coefficients

Massive constructions and hard surfaces

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
hard_surface	Walls, hard surfaces average (brick walls, plaster, hard floors, etc.)	0.02	0.02	0.03	0.03	0.04	0.05	0.05
brickwork	Walls, rendered brickwork	0.01	0.02	0.02	0.03	0.03	0.04	0.04
rough_concrete	Rough concrete	0.02	0.03	0.03	0.03	0.04	0.07	0.07
unpainted_concrete	Smooth unpainted concrete	0.01	0.01	0.02	0.02	0.02	0.05	0.05
rough_lime_wash	Rough lime wash	0.02	0.03	0.04	0.05	0.04	0.03	0.02
smooth_brickwork_flush_pointing	Smooth brickwork with flush pointing, painted	0.01	0.01	0.02	0.02	0.02	0.02	0.02
smooth_brickwork_10mm_pointing	Smooth brickwork, 10 mm deep pointing, pit sand mortar	0.08	0.09	0.12	0.16	0.22	0.24	0.24
brick_wall_rough	Brick wall, stuccoed with a rough finish	0.03	0.03	0.03	0.04	0.05	0.07	0.07
ceramic_tiles	Ceramic tiles with a smooth surface	0.01	0.01	0.01	0.02	0.02	0.02	0.02
limestone_wall	Limestone walls	0.02	0.02	0.03	0.04	0.05	0.05	0.05
reverb_chamber	Reverberation chamber walls	0.01	0.01	0.01	0.02	0.02	0.04	0.04
concrete_floor	Concrete floor	0.01	0.03	0.05	0.02	0.02	0.02	0.02
marble_floor	Marble floor	0.01	0.01	0.01	0.02	0.02	0.02	0.02

Lightweight constructions and linings

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
plasterboard	2 * 13 mm plasterboard on steel frame, 50 mm mineral wool in cavity, surface painted	0.15	0.1	0.06	0.04	0.04	0.05	0.05
wooden_lining	Wooden lining, 12 mm fixed on frame	0.27	0.23	0.22	0.15	0.1	0.07	0.06

Glazing

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
glass_3mm	Single pane of glass, 3 mm	0.08	0.04	0.03	0.03	0.02	0.02	0.02
glass_window lead_glazing	Glass window, 0.68 kg/m2 Lead glazing	0.1 0.3	0.05 0.2	0.04 0.14	0.03 0.1	0.03 0.05	0.03 0.05	0.03
double_glazing_30mm	Double glazing, 2–3 mm glass, > 30 mm gap	0.15	0.05	0.03	0.03	0.02	0.02	0.02
double_glazing_10mm double_glazing_inside	Double glazing, 2–3 mm glass, 10 mm gap Double glazing, lead on the inside	0.1 0.15	0.07 0.3	0.05 0.18	0.03 0.1	0.02 0.05	0.02 0.05	0.02

Wood

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
wood_1.6cm plywood_thin	Wood, 1.6 cm thick, on 4 cm wooden planks Thin plywood panelling	0.18 0.42	0.12 0.21	0.1 0.1	0.09 0.08	0.08 0.06	0.07 0.06	0.07
wood_16mm audience_floor stage_floor	16 mm wood on 40 mm studs Audience floor, 2 layers, 33 mm on sleepers over concrete Wood, stage floor, 2 layers, 27 mm over airspace	0.18 0.09 0.1	0.12 0.06 0.07	0.1 0.05 0.06	0.09 0.05 0.06	0.08 0.05 0.06	0.07 0.04 0.06	0.07
wooden_door	Solid wooden door	0.14	0.1	0.06	0.08	0.1	0.1	0.10

Floor coverings

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
linoleum_on_concrete	Linoleum, asphalt, rubber, or cork tile on concrete	0.02	0.03	0.03	0.03	0.03	0.02
carpet_cotton carpet_tufted_9.5mm carpet_thin	Cotton carpet Loop pile tufted carpet, 1.4 kg/m2, 9.5 mm pile height: On hair pad, 3.0 kg/m2 Thin carpet, cemented to concrete	0.07 0.1 0.02	0.31 0.4 0.04	0.49 0.62 0.08	0.81 0.7 0.2	0.66 0.63 0.35	0.54 0.88 0.4	0.48
carpet_6mm_closed_cell_foam	6 mm pile carpet bonded to closed-cell foam underlay	0.03	0.09	0.25	0.31	0.33	0.44	0.44
carpet_6mm_open_cell_foam	6 mm pile carpet bonded to open-cell foam underlay	0.03	0.09	0.2	0.54	0.7	0.72	0.72
carpet_tufted_9m	9 mm tufted pile carpet on felt underlay	0.08	0.08	0.3	0.6	0.75	0.8	0.80
felt_5mm carpet_soft_10mm	Needle felt 5 mm stuck to concrete 10 mm soft carpet on concrete	0.02 0.09	0.02 0.08	0.05 0.21	0.15 0.26	0.3 0.27	0.4 0.37	0.40
carpet_hairy carpet_rubber_5mm carpet_1.35_kg_m2 cocos_fibre_roll_29mm	Hairy carpet on 3 mm felt 5 mm rubber carpet on concrete Carpet 1.35 kg/m2, on hair felt or foam rubber Cocos fibre roll felt, 29 mm thick (unstressed), reverse side clad with paper, 2.2 kg/m2, 2 Rayl	0.11 0.04 0.08 0.1	0.14 0.04 0.24 0.13	0.37 0.08 0.57 0.22	0.43 0.12 0.69 0.35	0.27 0.1 0.71 0.47	0.25 0.1 0.73 0.57	0.25

Curtains

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
curtains_cotton_0.5	Cotton curtains (0.5 kg/m2) draped to 3/4 area approx. 130 mm from wall	0.3	0.45	0.65	0.56	0.59	0.71	0.71
curtains_0.2 curtains_cotton_0.33 curtains_densely_woven blinds_half_open blinds_open	Curtains (0.2 kg/m2) hung 90 mm from wall Cotton cloth (0.33 kg/m2) folded to 7/8 area Densely woven window curtains 90 mm from wall Vertical blinds, 15 cm from wall, half opened (45°) Vertical blinds, 15 cm from wall, open (90°)	0.05 0.03 0.06 0.03 0.03	0.06 0.12 0.1 0.09 0.06	0.39 0.15 0.38 0.24 0.13	0.63 0.27 0.63 0.46 0.28	0.7 0.37 0.7 0.79 0.49	0.73 0.42 0.73 0.76 0.56	0.73
curtains_velvet curtains_fabric	Tight velvet curtains Curtain fabric, 15 cm from wall	0.05 0.1	0.12 0.38	0.35 0.63	0.45 0.52	0.38 0.55	0.36 0.65	0.36
curtains_fabric_folded	Curtain fabric, folded, 15 cm from wall	0.12	0.6	0.98	1	1	1	1.00
curtains_glass_mat studio_curtains	Curtains of close-woven glass mat hung 50 mm from wall Studio curtains, 22 cm from wall	0.03 0.36	0.03 0.26	0.15 0.51	0.4 0.45	0.5 0.62	0.5 0.76	0.50

Seating (2 seats per m2)

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
chairs_wooden	Wooden chairs without cushion	0.05	0.08	0.1	0.12	0.12	0.12
chairs_unoccupied_plastic chairs_medium_upholstered chairs_heavy_upholstered	Unoccupied plastic chairs Medium upholstered concert chairs, empty Heavily upholstered seats, unoccupied	0.06 0.49 0.7	0.1 0.66 0.76	0.1 0.8 0.81	0.2 0.88 0.84	0.3 0.82 0.84	0.2 0.7 0.81	0.20
chairs_upholstered_cloth	Empty chairs, upholstered with cloth cover	0.44	0.6	0.77	0.89	0.82	0.7	0.70
chairs_upholstered_leather chairs_upholstered_moderate	Empty chairs, upholstered with leather cover Unoccupied, moderately upholstered chairs (0.90 m × 0.55 m)	0.4 0.44	0.5 0.56	0.58 0.67	0.61 0.74	0.58 0.83	0.5 0.87	0.50

Audience (unless not specified explicitly, 2 persons per m2)

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
audience_orchestra_choir	Areas with audience, orchestra or choir including narrow aisles	0.6	0.74	0.88	0.96	0.93	0.85	0.85
audience_wooden_chairs_1_m2	Audience on wooden chairs, 1 per m2	0.16	0.24	0.56	0.69	0.81	0.78	0.78
audience_wooden_chairs_2_m2	Audience on wooden chairs, 2 per m2	0.24	0.4	0.78	0.98	0.96	0.87	0.87
orchestra_1.5_m2 audience_0.72_m2 audience_1_m2 audience_1.5_m2 audience_2_m2 audience_upholstered_chairs_1 audience_upholstered_chairs_2	Orchestra with instruments on podium, 1.5 m2 per person Audience area, 0.72 persons / m2 Audience area, 1 person / m2 Audience area, 1.5 persons / m2 Audience area, 2 persons / m2 Audience in moderately upholstered chairs 0,85 m × 0,63 m Audience in moderately upholstered chairs 0,90 m × 0,55 m	0.27 0.1 0.16 0.22 0.26 0.72 0.55	0.53 0.21 0.29 0.38 0.46 0.82 0.86	0.67 0.41 0.55 0.71 0.87 0.91 0.83	0.93 0.65 0.8 0.95 0.99 0.93 0.87	0.87 0.75 0.92 0.99 0.99 0.94 0.9	0.8 0.71 0.9 0.99 0.99 0.87 0.87	0.80

Wall absorbers

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
panel_fabric_covered_6pcf	Fabric-covered panel, 6 pcf rockwool core	0.46	0.93	1	1	1	1	1.00
panel_fabric_covered_8pcf facing_brick acoustical_plaster_25mm	Fabric-covered panel, 8 pcf rockwool core Facing-brick brickwork, open butt joins, brick dimensions 230 × 50 × 55 mm Acoustical plaster, approx. 25 mm thick, 3.5 kg/m2/cm	0.21 0.04 0.17	0.66 0.14 0.36	1 0.49 0.66	1 0.35 0.65	0.97 0.31 0.62	0.98 0.36 0.68	0.98
rockwool_50mm_80kgm3	Rockwool thickness = 50 mm, 80 kg/m3	0.22	0.6	0.92	0.9	0.88	0.88	0.88
rockwool_50mm_40kgm3	Rockwool thickness = 50 mm, 40 kg/m3	0.23	0.59	0.86	0.86	0.86	0.86	0.86
mineral_wool_50mm_40kgm3	50 mm mineral wool (40 kg/m3), glued to wall, untreated surface	0.15	0.7	0.6	0.6	0.85	0.9	0.90
mineral_wool_50mm_70kgm3 gypsum_board perforated_veneered_chipboard fibre_absorber_1 fibre_absorber_2	50 mm mineral wool (70 kg/m3) 300 mm in front of wall Gypsum board, perforation 19.6%, hole diameter 15 mm, backed by fibrous web 12 Rayl, 100 mm cavity filled with mineral fibre mat 1,05 kg/m2, 7,5 Rayl Perforated veneered chipboard, 50 mm, 1 mm holes, 3 mm spacing, 9% hole surface ratio, 150 mm cavity filled with 30 mm mineral wool Fibre absorber, mineral fibre, 20 mm thick, 3.4 kg/m2, 50 mm cavity Fibre absorber, mats of porous flexible fibrous web fabric, self-extinguishing	0.7 0.3 0.41 0.2 0.07	0.45 0.69 0.67 0.56 0.07	0.65 1 0.58 0.82 0.2	0.6 0.81 0.59 0.87 0.41	0.75 0.66 0.68 0.7 0.75	0.65 0.62 0.35 0.53 0.97	0.65

Ceiling absorbers

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
ceiling_plasterboard	Plasterboard ceiling on battens with large air-space above	0.2	0.15	0.1	0.08	0.04	0.02
ceiling_fibre_abosrber ceiling_fissured_tile ceiling_perforated_gypsum_board ceiling_melamine_foam ceiling_metal_panel	Fibre absorber on perforated sheet metal cartridge, 0,5 mm zinc-plated steel, 1.5 mm hole diameter, 200 mm cavity filled with 20 mm mineral wool (20 kg/m3), inflammable Fissured ceiling tile Perforated 27 mm gypsum board (16%), d = 4,5 mm, 300 mm from ceiling Wedge-shaped, melamine foam, ceiling tile Metal panel ceiling, backed by 20 mm Sillan acoustic tiles, panel width 85 mm, panel spacing 15 mm, cavity 35 cm	0.48 0.49 0.45 0.12 0.59	0.97 0.53 0.55 0.33 0.8	1 0.53 0.6 0.83 0.82	0.97 0.75 0.9 0.97 0.65	1 0.92 0.86 0.98 0.27	1 0.99 0.75 0.95 0.23	1.00

Special absorbers

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
microperforated_foil_kaefer microperforated_glass_sheets hanging_absorber_panels_1 hanging_absorber_panels_2	Microperforated foil “Microsorber” (Kaefer) Microperforated glass sheets, 5 mm cavity Hanging absorber panels (foam), 400 mm depth, 400 mm distance Hanging absorber panels (foam), 400 mm depth, 700 mm distance	0.06 0.1 0.25 0.2	0.28 0.45 0.45 0.3	0.7 0.85 0.8 0.6	0.68 0.3 0.9 0.75	0.74 0.1 0.85 0.7	0.53 0.05 0.8 0.7

Scattering Coefficients

Diffusers

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
rpg_skyline rpg_qrd	Diffuser RPG Skyline Diffuser RPG QRD	0.01 0.06	0.08 0.15	0.45 0.45	0.82 0.95	1 0.88	0.91

Seating and audience

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
theatre_audience	Theatre Audience	0.3	0.5	0.6	0.6	0.7	0.70	0.70
classroom_tables amphitheatre_steps	Rows of classroom tables and persons on chairs Amphitheatre steps, length 82 cm, height 30 cm (Farnetani 2005)	0.2 0.05	0.3 0.45	0.4 0.75	0.5 0.9	0.5 0.9	0.60	0.60

Round Robin III – wall and ceiling

keyword	description	125 Hz	250 Hz	500 Hz	1 kHz	2 kHz	4 kHz	8 kHz
rect_prism_boxes trapezoidal_boxes	Rectangularandprismboxes (studio wall) “Round Robin III” (after (Bork 2005a)) Trapezoidal boxes (studio ceiling) “Round Robin III” (after (Bork 2005a))	0.5 0.13	0.9 0.56	0.95 0.95	0.95 0.95	0.95 0.95	0.95 0.95