long-term current draw. Read more about the AFS limiter under “Protection” on page 16. There is also a
Technical Note on our website www.labgruppen.com
: AFS limiting and power consumption.
It is more useful to state the current draw in different loads and output power levels. These figures can
be found on the specification sheet. The current draw is measured in Ampere rms. This figure
corresponds to the minimum value of the mains fuse needed.
We recommend you to design the power distribution at least for the current at 1/8 power, and for 1/3
power for heavy-duty demands like discotheques, etc.
Second, the maximum expected average current under worst case program material, which is 1/3 of full
power according to the FTC standard. At this level the music will be in the state of constant clip and is
therefore the highest power level one can obtain without completely obliterating the program.
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
of 9dB, which is very low for regular audio program.
able 3
SKTKN= `~äÅìä~íáçå=
e calculated as in the following example:
4 ohms load on an amplifier
tts, and
to the chart above is then 1975 watts. This chart shows the active
he heat power produced is the difference between the power consumption and output power:
roduced 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:
Power* AFS activated 1/3 Power 1/8 Power Idle
[W] [W] ** ***
fP 6400 8 ohms 2x 1300 1300 1230 575 105
4 ohms 2x 2300 1450 1975 900 105
2 ohms 2x 3200 1850 2950 1290 105
* = Will be reduced by AFS limiter.
** = Average power with music as program source. The amplifier driven to clip level.
*** = Regular music power with 9dB headroom, IEC standard power rating.
MAINS INPUT POWERMAX OUTPUT POWER
T
The heat power can b
We consider a headroom of at least 5dB (1/3 of full power) and a
producing 2300 watts per channel. The 1/3 power per channel is accordingly 2300 / 3 = 767 wa
total output 2 x 767 = 1534 watts.
The power consumption according
power consumption of the amplifier with different loads and power levels.
T
1975 - 1534 = 441 watts per amplifier.
The chart below shows the heat power p
1/3 Power* 1/8 Power** 1/3 Power* 1/8 Power** 1/3 Power* 1/8 Power**
[W] [W] kcal / h kcal / h BTU / h BTU / h
fP 6400 8 ohms 363 250 310 220 1240 850
4 ohms 442 325 380 280 1510 1110
2 ohms 817 490 700 420 2790 1670
* = Average power with music as program source. The amplifier driven to clip level.
** = Regular music power with 9dB headroom, IEC standard power rating.
HEAT POWER
T
1533 watts / 1975 watts= 78%.
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