these type of cabins have two layers and each layer internally and externally, are made of acoustic noise protectors type SX-8 therefore
the external layer of cabin will absorb any noises As in charts3 which have been correctly measured by scientific researches organization, are having higher
isolation numbers than the accepted standard ones. they have
also achived the ISO of scientific researches organization.
Chart 3 the rate of isolation in Type B cabin:
Frequency (Hz)
125
250
500
1000
2000
4000
8000
Decrease of standard noise
28
29
32
34
46
51
57
Decrease of cabin noise
37
38
46
56
66
66
72
one of the characteristics of Type B cabins is that in the environments having 45 db on figure A will be capable of hearing Type B2 cabins
with a metal-layered between two layers has been used IRIB 3, for recording voices.
Table 4
Layers
double window
double doors
cover
Panel handler
Electricity
Light
Air condition
Type A cabin has 5 and Type B cabin has 8 layers
Windows class with 10mm length and one of the glasses is diverted
on isolated doors back and front is covered with leathers
a rug suitable for the wooden cabins
8 jack panel mono connectors 6ones stereo 2ones
sockets with audiometers on the cabin layers
25 watt lamp with holders
Having noise protectors and 2 fans for air flews
Type A Cabin
these type of cabins have 2 layers. they all are internally covered with material as acoustic SX-8 on the second layer, the external surface of particleboard is covered by colors
(Panel SX-8 is made of white Mdf with 8 holes and the space of 8mm from each other. they are made by 80p from nice covering materials.
Chart 2 the rate of isolation in Type A cabin:
Frequency (Hz)
125
250
500
1000
2000
4000
8000
Decrease of standard noise
28
29
32
34
46
51
57
Decrease of cabin noise
31
36
41
53
54
56
56
Audiometric cabins Type A are standard ones to protect extra noises. This is important that places in which this type of cabin is
designed, the acoustic layer mustn't be more 35dB in room installing at leat 7.5m2 Sx-8 panel for noise protecting is advised.
Chart 1 measures and physical characterisics of cabins
Type of cabins
The window
Acoustic door
weight
External measures of cabin
External measures of cabin
width
length
width
length
Kg
height
width
length
height
width
length
Type A
52
61
*67
*182
550
229
123
123
204
100
100
Type A1
52
61
67
182
670
229
155
155
204
100
132
Type A2
52
61
67
182
790
229
155
155
204
132
132
Type B
52
61
72
182
900
229
167
167
204
132
132
Type B1
52
61
72
182
1098
229
198
198
204
132
165
Type B2
52
61
72
182
1250
229
231
231
204
165
198
Cabin A with internal measures 100*100 has only one isolated door, the otherhave got.
Noise protectors of the air condition that are also in labyrinths, almost add 20cm to the whole
height of the cabin.
