Lab.gruppen fP 2200 - Manual (Page 11)

MAX OUTPUT POWER MAINS INPUT POWER
Power 1/3 Power 1/8 Power Idle
[W] note 1 note 2
fP 2200 8 ohms 2x 350 630 400 110
4 ohms 2x 650 1120 700 110
2 ohms 2x 1100 1975 1185 110
note 1 Average power with music as program source. The amplifier driven to clip level.
note 2 Normal music power with 9dB headroom, IEC standard power rating.
Table 1
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The heat power can be calculated as in the following example:
We consider a headroom of at least 5dB (1/3 of full power) and a 4 ohms load on an amplifier
producing 650 watts per channel. The 1/3 power per channel is accordingly 650 / 3 = 217 watts, and
total output 2 x 217 = 433 watts.
The power consumption according to the chart above is then 1330 watts. This chart shows the active
power consumption of the amplifier with different loads and power levels.
The heat power produced is the difference between the power consumption and output power:
1120 - 433 = 687 watts per amplifier.
The chart below shows the heat power produced in watts, in kcal per hour, and also in BTU per hour.
1/3 Power(1) 1/8 Power (2) 1/3 Power(1) 1/8 Power (2) 1/3 Power(1) 1/8 Power (2)
[W] [W] kcal / h kcal / h BTU / h BTU / h
fP 2200 8 ohms 397 313 340 270 1350 1070
4 ohms 687 538 590 460 2340 1840
2 ohms 1242 910 1070 780 4240 3110
note 1 Average power with music as program source. The amplifier driven to clip level.
note 2 Normal music power with 9dB headroom, IEC standard power rating.
HEAT POWER
The efficiency can also be calculated, it being the output-power divided by the input-power:
433 watts / 1120 watts= 39%.
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The XLR input connectors are electronically balanced, and wired according to the IEC 268 (pin 2 =
“hot”), and wired in the following way:
PIN 1
GROUND/SHIELD
PIN 2 HOT (+)
PIN 3 COLD (-)
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