Last
, the "regular operating power" as defined by the safety standard IEC 65/ANSI/UL 6500 and used
by a majority of safety agencies. The regular operating power is measured by using pink noise, and with
an average output power equal to 1/8 of full power. The one eighth of the total power is as loud as you
can play music while making some attempt to avoid obvious clipping. It also corresponds to a headroom
Table 2
of 9dB, which is very low for regular audio program.
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e calculated as in the following example:
4 ohms load on an amplifier
, and
g to the chart above is then 1330 watts. This chart shows the active
he
heat power produced
is the difference between the power consumption and output power:
produced in watts, in kcal per hour, and also in BTU per hour.
he
efficiency
can also be calculated, it being the output-power divided by the input-power:
07 watts / 1325 watts= 38%.
Power
1/3 Power
1/8 Power
Idle
[W]
note 1
note 2
fP 2400Q
8 ohms
4x
360
1140
820
175
4 ohms*
4x
380
1325
840
175
2 ohms*
4x
500
2125
1440
175
* MLS at -3dB
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.
MAINS INPUT POWER
MAX OUTPUT POWER
The
heat power
can b
We consider a headroom of at least 5dB (1/3 of full power) and a
producing 380 watts per channel. The 1/3 power per channel is accordingly 380 / 3 = 127 watts
total output 4 x 127 = 507 watts.
The power consumption accordin
power consumption of the amplifier with different loads and power levels.
T
1325 – 507 = 818 watts per amplifier.
The chart below shows the heat power
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 2400Q
8 ohms
660
640
570
550
2250
2180
4 ohms
818
650
700
560
2790
2220
2 ohms
1458
1190
1250
1020
4980
4060
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
T
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XLR Input connectors are active balanced and wired according to the
IEC 268
, that is pin 2 hot, and wired
ND/SHIELD
IN 2
HOT (+)
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in the following way:
PIN 1
GROU
P
PIN 3
COLD (-)
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