The Quadra series

Overview of perforations of the Rekton Quadra type

certified according to DIN EN 20354 (ISO) 354

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,07

0,17

0,61

0,98

0,45

0,15

50 mm reverberation space

as

0,16

0,68

0,98

0,81

0,52

0,27

Percentage of perforations/open surface 6.25 %

Quadra 5-20

hole size 5 x 5 mm
centre distance 20 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,09

0,32

0,89

0,28

0,07

---

50 mm reverberation space

as

0,34

0,83

0,55

0,26

0,12

0,03

Percentage of perforations/open surface 1.56 %


Quadra 5-40

hole size 5 x 5 mm
centre distance 40 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,06

0,11

0,36

0,76

0,92

0,63

50 mm reverberation space

as

0,17

0,51

0,94

0,99

0,87

0,70

Percentage of perforations/open surface 31.36 %

Quadra 8-14

hole size 8 x 8 mm
centre distance 14 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,06

0,13

0,42

0,90

0,83

0,29

50 mm reverberation space

as

0,21

0,52

0,98

1,00

0,86

0,58

Percentage of perforations/open surface 16.00 %

Quadra 8-20

hole size 8 x 8 mm
centre distance 20 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,10

0,27

0,87

0,64

0,24

---

50 mm reverberation space

as

0,32

0,81

0,80

0,52

0,29

0,13

Percentage of perforations/open surface 4.00 %

Quadra 8-40

hole size 8 x 8 mm
centre distance 40 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,06

0,11

0,39

0,83

0,90

0,51

50 mm reverberation space

as

0,24

0,54

0,97

0,97

0,85

0,59

Percentage of perforations/open surface 25.00 %

Quadra 10-20

hole size 10 x 10 mm
centre distance 20 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,11

0,21

0,75

0,85

0,37

0,03

50 mm reverberation space

as

0,25

0,69

0,87

0,66

0,41

0,20

Percentage of perforations/open surface 6.25 %

Quadra 10-40

hole size 10 x 10 mm
centre distance 40 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

---

---

---

---

---

---

50 mm reverberation space

as

---

---

---

---

---

---

Percentage of perforations/open surface 25.00 %

Quadra 20-40

hole size 20 x 20 mm
centre distance 40 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

---

---

---

---

---

---

50 mm reverberation space

as

---

---

---

---

---

---

Percentage of perforations/open surface 11.11 %

Quadra 20-60

hole size 20 x 20 mm
centre distance 60 mm

Perforationen Typ Rekton Quadra SLD

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,08

0,17

0,61

0,99

0,43

---

50 mm reverberation space

as

0,25

0,68

0,91

0,78

0,46

0,03

Percentage of perforations/open surface 5.9 %

Quadra 5-20 SLD

hole size 5 x 5 mm
centre distance 14.14 mm

Design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,11

0,28

0,86

0,30

0,08

---

50 mm reverberation space

as

0,30

0,79

0,54

0,27

0,14

0,07

Percentage of perforations/open surface 1.53 %

Quadra 5-40 SLD

hole size 5 x 5 mm
centre distance 28.28 mm

design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

---

---

---

---

---

---

50 mm reverberation space

as

---

---

---

---

---

---

Percentage of perforations/open surface 31.36 %

Quadra 8-14 SLD

hole size 8 x 8 mm
centre distance 9.9 mm

design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,07

0,14

0,44

0,96

0,88

0,39

50 mm reverberation space

as

0,24

0,60

0,96

0,97

0,78

0,41

Percentage of perforations/open surface 15.23 %

Quadra 8-20 SLD

hole size 8 x 8 mm
centre distance 14.14 mm

design example

Type of installation

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,11

0,25

0,84

0,61

0,25

---

50 mm reverberation space

as

0,27

0,78

0,75

0,49

0,28

0,12

Percentage of perforations/open surface 3.92 %


Quadra 8-40 SLD

hole size 8 x 8 mm
centre distance 28,28 mm

design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,07

0,12

0,39

0,84

0,91

0,59

50 mm reverberation space

as

0,16

0,50

0,92

1,00

0,90

0,76

Percentage of perforations/open surface 6.25 %

Quadra 10-20 SLD

hole size 10 x 10 mm
centre distance 14,14 mm

design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

0,07

0,20

0,74

0,81

0,40

0,15

50 mm reverberation space

as

0,25

0,61

0,83

0,64

0,41

0,24

Percentage of perforations/open surface 6.25 %

Quadra 10-40 SLD

hole size 10 x 10 mm
centre distance 28,28 mm

Perforationen Typ Rekton Quadra SL

design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

---

---

---

---

---

---

50 mm reverberation space

as

---

---

---

---

---

---

Percentage of perforations/open surface 12.50 %

Quadra 10-20 SL

hole size 10 x 10 mm
centre distance 28,28 mm

design example

Level of sound absorption

Type of installation

f(Hz)

125

250

500

1000

2000

4000

Without reverberation space

as

---

---

---

---

---

---

50 mm reverberation space

as

---

---

---

---

---

---

Percentage of perforations/open surface 3.12 %

Quadra 10-40 SL

hole size 10 x 10 mm
distance centre 56,56 mm

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