L-Acoustics LA4, Руководство пользователя

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LA4
AMPLIFIED CONTROLLER
User Manual
VERSION 1.1
LA4_UM_ML_1.1
w w w . l - a c o u s t i c s . c o m
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6.6.3 L-NET Wiring
The LA4 can be connected to a computer running PC-based LA NETWORK MANAGER Software and to a network of
other controllers via the I/O Ethernet sockets located on the rear panel using standard CAT5e STP (or more) cables
and RJ45 connectors (see Figure 11)
Figure 11: L-NET RJ45 Connector sockets for networking and remote control
Note: The network is 100 Mbps with 100 Ω impedance.
The CAT5e STP reference stands for a category 5 Shielded Twisted Pair cable.
6.7 Power consumption
The power requirements of the LA4 (4 channels being driven at the same time) summarized in Table 3 are dependent
of load impedance and signal level/characteristic:
Table 3: LA4 Maximum Output Power versus Mains Input Power
Maximum output power Mains input power and current draw
Load Number of channels Power 1/3 Output Power (-5dB) 1/8 Output Power (-9dB)
4 Ω 4X 1000 W 22 A / 3250 W 12 A / 1600 W
8 Ω 4X 800 W 17 A / 2550 W 9 A / 1350 W
Values given for 230V mains input. Multiply current values by 2 for 120 V / Multiply current values by 2.3 for 100 V.
Note: 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 1000 W output power. 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 controller. Moreover, the
controller’s power consumption is 1500 W (according to Table 3). Then the
heat power produced is 1500 - 500 =
1000 watts (difference between power consumption and output power).