Manufacturer

Lindner Group

Lindner Group, Arnstorf: metal ceilings, heating and cooling ceilings, raised floors, wall and ceiling linings and the MUTE+ sound absorber line.

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Datasheet acoustic insert Calma Datasheet MUTE+ cover S45/S60-W

MUTE+ cover wall absorber

Name: MUTE+ cover wall absorber
Brand: Lindner Group

Description

Wall absorber with an aluminium frame, fabric covering of polyester or wool and an additional acoustic insert. Free of mineral fibres and allergy-friendly, 100 percent recyclable and reusable. The frame sits concealed behind the covering.

Technical data

Material: Aluminium frame, covering of polyester or wool

Surface: Fabric covering wrapped over the edge

Up to fire class: B1 — per DIN 4102, wool covering B2

Certifications: Oeko-Tex Standard 100 (S24-3191, Hohenstein HTTI), Indoor Air Comfort GOLD, emission class A+ (VOC, France)

Colours: 20 standard colours, covering of polyester or wool

Measurement data

Sound absorption

Reverberation chamber (ASTM C423 / ISO 354)· 8 variants

NRC

0.90

Frequency values

α_p per octave band

f (Hz)	125	250	500	1k	2k	4k
α_p	0.20	0.80	0.95	0.95	0.90	0.85

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			Value
2.4 in	—	plane absorber	NRC0.90
1.8 in	—	plane absorber	NRC0.85
1.8 in	2.1 in	absorber 2000 x 39 in	A_obj1.90m²
2.4 in	2.7 in	absorber 2000 x 39 in	A_obj1.90m²
2.4 in	2.7 in	absorber 1500 x 39 in	A_obj1.50m²
1.8 in	2.1 in	absorber 1500 x 39 in	A_obj1.40m²
1.8 in	2.1 in	absorber 1000 x 39 in	A_obj1.00m²
2.4 in	2.7 in	absorber 1000 x 39 in	A_obj1.00m²

Test report: H220914M1/11g_rev00

NRC: 0.90 (derived from ISO 354 lab data)

Object area: 113 sq ft

Absorber: 1 in Calma

Measured values as a table (8 measurements)

MUTE+ cover wall absorber: sound absorption coefficient αs per ISO 354 by frequency and test build-up
Build-up	NRC	100 Hz	125 Hz	160 Hz	200 Hz	250 Hz	315 Hz	400 Hz	500 Hz	630 Hz	800 Hz	1000 Hz	1250 Hz	1600 Hz	2000 Hz	2500 Hz	3150 Hz	4000 Hz	5000 Hz
45 mm · plane absorber	0.85	0.08	0.12	0.29	0.51	0.68	0.88	0.94	0.95	0.97	0.91	0.90	0.86	0.85	0.84	0.84	0.84	0.81	0.83
45 mm · 53 mm · absorber 1500 x 1000 mm (A_obj, m²)	–	0.10	0.10	0.40	0.80	1.00	1.40	1.70	1.80	1.60	1.50	1.40	1.30	1.40	1.30	1.30	1.30	1.30	1.20
45 mm · 53 mm · absorber 2000 x 1000 mm (A_obj, m²)	–	0.10	0.20	0.50	1.00	1.40	1.90	2.20	2.30	2.20	2.00	1.90	1.80	1.80	1.70	1.90	1.90	1.90	1.80
45 mm · 53 mm · absorber 1000 x 1000 mm (A_obj, m²)	–	0.10	0.10	0.30	0.60	0.70	0.90	1.10	1.20	1.20	1.10	1.00	0.90	0.90	0.80	0.90	0.90	0.90	0.90
60 mm · 68 mm · absorber 1000 x 1000 mm (A_obj, m²)	–	0.10	0.10	0.40	0.70	0.90	1.00	1.20	1.20	1.10	1.00	1.00	0.90	0.90	0.90	0.90	0.80	0.90	0.80
60 mm · 68 mm · absorber 1500 x 1000 mm (A_obj, m²)	–	0.10	0.10	0.40	1.00	1.30	1.60	1.80	1.70	1.70	1.60	1.50	1.40	1.40	1.40	1.40	1.40	1.40	1.40
60 mm · 68 mm · absorber 2000 x 1000 mm (A_obj, m²)	–	0.10	0.20	0.50	1.20	1.50	2.00	2.20	2.30	2.20	2.10	1.90	1.90	1.80	1.80	1.80	1.80	1.80	1.70
60 mm · plane absorber	0.90	0.10	0.15	0.37	0.61	0.81	0.95	0.98	0.95	0.98	0.93	0.96	0.89	0.93	0.91	0.89	0.90	0.83	0.84

Measured values as a table (8 measurements)

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Last updated: 09/15/2026