L-Net Wiring; Power Consumption; Heat Power Calculation - L-Acoustics LA8 Manuel Utilisateur

LA8
AMPLIFIED CONTROLLER
User Manual
VERSION 1.2
6.6.3

L-NET Wiring

The LA8 can be connected to a network of several controllers driven by the PC-based LA NETWORK MANAGER
software. The connection is done using the I/O Ethernet sockets located on the LA8 rear panel using standard CAT5e
STP cables (or higher category) and RJ45 connectors (see Figure 11).
Figure 11: L-NET RJ45 connector sockets for networking and remote control
Note: The network is rated at 100 Mbps. The CAT5e STP reference stands for a category 5 Shielded Twisted Pair cable.
6.7

Power consumption

The LA8 power requirements summarized in Table 3 (4 channels being driven at the same time) are dependent of load
impedance and signal level characteristics:
Table 3: LA8 Maximum Output Power versus Mains Input Power
Maximum output power
Load Number of channels
4 Ω 4 x
8 Ω 4 x
Values given for 230 V mains input. Multiply current values by 2 for 120 V. Multiply current values by approx. 2.3 for 100 V.
Notes: 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).
6.8

Heat power calculation

For example, let's connect a 4 Ω load to each output channel of the controller: each output channel can now deliver up
to 1800 W output power. Consider a standard use at 1/8 of full power (9 dB headroom). The power delivered per
channel is then 1800 / 8 = 225 W, leading to a total power of 4 x 225 = 900 W for the controller. According to Table 3
the controller's power consumption is 1500 W, the heat power produced is then 1500 - 900 = 600 watts (difference
between power consumption and output power).
LA8_UM_EN_1.2
Mains input power and current draw
Power 1/3 Output Power (-5 dB)
1800 W 22 A / 3100 W
1100 W 15 A / 1950 W
w w w . l - a c o u s t i c s . c o m
1/8 Output Power (-9 dB)
11 A / 1500 W
10 A / 1300 W
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