L-ACOUSTICS LA 24 MANUAL Version 2.2
17/11/08 8
MAXIMUM OUTPUT POWER
MAINS INPUT POWER
Load
# of Ch
Power
Full Power
1/3 Power
1/8 Power
Idle
(watts)
(sine wave)
(see note 1)
(see note 2)
8 ohms
2X
1000
2900
1200
600
130
4 ohms
2X
1400
4300
1700
900
130
2 ohms
2X
1400
6000
2200
1100
130
note 1
Mean power with music as program source (amplifier driven to clip level)
note 2
Normal music power with 9 dB headroom (IEC standard power rating)
Table 1
The current draw
can be calculated by dividing the mains input power by the mains voltage.
We recommend you design your power distribution system to ensure sufficient current for at
least 1/8 power operation and to upgrade service to meet 1/3 power requirements for heavy
duty demands like discos etc.
The heat power
can be calculated according to the following example:
Consider a headroom of at least 9 dB and a 4 ohm load on an amplifier producing 1400 watts
per channel. The 1/8 power per channel is then: 1400 / 8 = 175 watts; total output: 2 x 175
= 350 watts.
The power consumption according to Table 1 is 900 watts.
The heat power produced
is the difference between the power consumption and output
power :
900 - 350 = 550 watts per amplifier.
Input connections
XLR Input connectors are balanced and wired according to
IEC 268
(pin 2 hot):
PIN 1
GROUND/SHIELD
PIN 2
HOT (+ve)
PIN 3
COLD (-ve)
Figure 3. XLR input connector pinout
There are also TRS jacks for linking etc. They are wired as follows:
TIP
HOT (+ve)
RING
COLD (-ve)
SLEEVE
GROUND/SHIELD
Figure 4. TRS phone plug
