Bosch Communications Systems 2011 Bosch Public Address ...

Plena Loop Amplifier | Installation and User Instructions | Design and planning en | 17
3
10
2
1
Why would a PA require 0 more than one zone?
-1
Many PA installations -2have
different areas, with different requirements.
20
-3
Pub with a Bistro -4
-5
In this example there are 2 reasons: 30
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• Both areas may like -7 to have the same background music or source, but at different volume levels.
• The patrons at the -8 bar do 40 not want to be disturbed by the order numbers called from the paging microphone in
the Bistro -9
-10 50
Therefore:
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60
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• Zone 1 will be the Bar
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• Zone 2 will be the Bistro 70
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-15 80
A Bosch Plena 2 zone mixer amplifier or alternatively a 2 zone pre-amplifier and power amplifier would be perfect
solutions for this application.
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90
-17
What wire does the -18Loop
Amplifier 100 require?
-19
0 10 20 30 40 50 60 70 80 90 100
Strand or solid core cable will be fine. There is a minimum and maximum gauge of wire that is required so that it can
operate as an induction loop.
width (%)
See table below.
figure 2.8: Extra power vs. the width of the room
wire diameter (mm)
power (dB)
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
AWG 20
0.75
0.50
0.25
0.00
0 25 34
30
50 76 90100 135 150 200 250 300
303
350
ure 2.9: Wire diameter vs. the wire length (copper wires)
Bosch Security Systems | 2005-05 | 9922 141 50672en
wire length (m)
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