·Material：high quality MDF, fireproofing cloth, painted facing.
·Theory： adjust structure of grooved the front and perforated the back and change groove width and hole depth, volume of the back cavity , we can get different absorption effect on different frequency.
·Character：fireproof、moistureproof、beautiful、Environmental protection、easy-installation and long-using
·Function：absorb sound or reduce noise and decoration.
·Type：28/4
·Specification：Ｌ2440mm×Ｗ128mm×Ｈ25mm(or customer made)
·Application：Broadcast station, TV station, library, theater, opera house, hotel, meeting room, church, factory, shop, gym, school etc.
·28/4 Absorption coefficient:
|
type13PMK
|
Center frequency (Hz)
|
125
|
250
|
500
|
1000
|
2000
|
4000
|
Noise reduction coefficient
NRC
|
|
Back cavity 50mm
|
Absorption coefficient a
|
0.43
|
1.08
|
1.12
|
0.97
|
0.90
|
0.92
|
1.02
|
|
Back cavity 100mm
|
Absorption coefficient a
|
0.65
|
1.05
|
1.02
|
0.94
|
0.82
|
0.83
|
0.96
|
|
Back cavity 200mm
|
Absorption coefficient a
|
