Power Cord; Power Consumption; Example Of Heat Power Calculation - L-Acoustics LA4X User Manual

3.3.5

Power cord

The LA4X is supplied with a removable power cord. One side of the power
cord is fitted with a PowerCON connector to connect to the MAINS panel on
the rear side of the controller, see Figure 6. The other side is fitted with a plug
to connect to mains.
The plug type depends on the country of use, according to the following table:
Table 1: Power cords for LA4X
Country Plug type
Europe CEE 7/7, 16 A / 250 V grounded
USA NEMA 5-15, 15 A / 125 V grounded
Plug connection
Strictly apply the specific safety regulations of the country of use.
Do not defeat the ground connection of the supplied power cord using an adaptor or any other methods.
If the plug does not match the local power outlet, it can be cut off and wired to a suitable plug (refer to the
LA4X maintenance manual – level 1).
Verify that the plug conforms to the specific voltage and current rating given in section 3.3.1.
3.3.6

Power consumption

The LA4X power requirements depend on the load impedance and the signal level as indicated in the following table:
Maximum output power
Number of
Load
driven channels
4 or 8 Ω 4
The current values are given for a mains rated at 230 V. Multiply by 2.3 for 100 V, 1.9 for 120 V or 1.15 for 200 V.
Output power references
A third of the maximum output power corresponds to the worst case scenario of a program source using highly
compressed music or pink noise with amplifier driven to clip level.
An eighth of the maximum output power corresponds to a loud music program with a small dynamic range and
9 dB of headroom (IEC standard power rating).
3.3.7

Example of heat power calculation

Connect a 4 Ω load to each output channel of the LA4X: each channel can now deliver a power of up to 1000 W.
Consider a standard use at 1/8 of full power (9 dB headroom): the power delivered per channel is then 1000 / 8 = 125
W, leading to a total power of 4 x 125 = 500 W for the LA4X.
According to Table 2 the LA4X power consumption is 750 W: the heat power produced is then 750 - 500 = 250 W
(difference between power consumption and output power).
LA4X_UM_EN_4.0
Table 2: LA4X mains input power and current draw
Power per 1/3 max. output
channel power (-5 dB)
1000 W 7 A / 1600 W
w w w . l - a c o u s t i c s . c o m
Figure 6: LA4X MAINS panel
Mains input power and current draw
1/8 max. output
power (-9 dB)
3 A / 750 W
IDLE Standby
0.26 A / < 0.1 A /
60 W 11 W
15