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User and Installation Manual
Compact MPA
5.2.7 AMPLIFIERS
The number of loudspeakers, their tapping (actual power output) and, in some cases, the zone segmentation determines the
necessary number of amplifiers in the amplifier pool.
In a fixed line level (100V) system such as the Compact MPA, the requirement for amplifier power is exactly the same as the
loudspeaker output figure.
During planning of the Compact MPA GA / PA system installation it is recommended to allow for 10 – 25 % headroom for
the amplifier pool. This is to take account of any adjustments during installation or as a result of subsequent changes to the
configuration.
The 1671 power amplifier delivers a maximum continuous power output of 250W. Note that if the 1671’s auxillary 24VDC
power output is used, the available audio power output is reduced to 220W.
Amplifier requirement calculation example. Amp 1’s 24VDC output is used, reducing its power output to 220W:
System A (identical to B) #
6W loudsp.
(CAR 6T)
#
15W loudsp.
(HP15T)
Tot. W AMP:
Zone 1 (cabins & corridors) 20 1,5W 30W Amp 1: 220W
Zone 2 (crew accommodation) 10 3W 4 7,5W 60W Amp 1: 220W
Zone 3 (working areas) 5 6W 3 15W 75W Amp 2: 250W
Zone 4 (engine room spaces) 6 15W 90W Amp 2: 250W
Zone 5 (outdoor spaces) 15 15W 225W Amp 3: 250W
Zone 6 (passenger spaces) 20 1,5W 4 7,5W 60W Amp 1: 220W
System B (identical to A) #
6W loudsp.
(CAR 6T)
#
15W loudsp.
(HP15T)
Tot. W AMP:
Zone 1 (cabins & corridors) 20 1,5W 30W Amp 1: 220W
Zone 2 (crew accommodation) 10 3W 4 7,5W 60W Amp 1: 220W
Zone 3 (working areas) 5 6W 3 15W 75W Amp 2: 250W
Zone 4 (engine room spaces) 6 15W 90W Amp 2: 250W
Zone 5 (outdoor spaces) 15 15W 225W Amp 3: 250W
Zone 6 (passenger spaces) 20 1,5W 4 7,5W 60W Amp 1: 220W
This example gives a reasonable safety margin for miscalculation and/or headroom for future adjustment:
• Amp 1 : Derated to 220W, 150W load, 42 % Headroom
• Amp 2 : 225W load, 10 % Headroom
• Amp 3 : 225W load, 10 % Headroom
5.2.8 SHORT CIRCUIT PROOF LOUDSPEAKERS
A 100V line adapted loudspeaker equipped with a line transformer is regarded as a protection against loudspeaker short
circuit and is required in all installations (independent of type of vessel).