L-ACOUSTICS LA 24 MANUAL Version 2.2 17/11/08 12
• OPERATING MODES
Stereo operation
For stereo (dual channel) operation, leave the Link and Phase reverse switches in the
undepressed position (OUT). Both channels operate independently of each other and their
individual level attenuators control their respective levels.
Never connect either output terminal to ground or in parallel. The recommended
minimum nominal impedance, for stereo or tandem operation, is 2 ohms per channel.
Tandem mono
For tandem (dual channel-single input) operation, depress the Link switch (IN position). Both
channels are now driven by the same signal which can be applied at either input connector.
The output connection is the same as for stereo mode and both level attenuators are active,
allowing you to set different levels for each channel. You can use either of the two TRS
connectors for linking the signal to other amplifiers (daisychaining). Do not use the
remaining XLR and TRS connectors for mixing or other purposes. Never connect
either output terminal to ground or in parallel.
Bridged mono
To bridge the amplifier, depress the Link Switch (7) and Phase Reverse Switch (6). Both
channels are then driven by a single signal which can be applied at either input A or B. You can
use any remaining input connectors for linking etc. Do not use the remaining XLR and TRS as
input jacks simultaneously for mixing or other purposes.
Connect the speaker leads to pin +1 on the Channel A Speakon (positive speaker
terminal) and pin +1 on the Channel B Speakon (negative speaker negative).
Alternatively, connect the positive speaker terminal to +1 and the negative speaker
terminal to +2 of the Channel A Speakon. Do not connect either of the -1
(negative) pins of the Speakons. Do not connect speakers to channel A or B in the
normal manner in bridged mode, as this can cause serious damage.
The recommended minimum nominal impedance for bridged mono is 4 ohms (equivalent to
driving both channels at 2 ohms). Driving bridged loads of less than 4 ohms may cause
thermal overload.
Figure 11. Bridged mono connection
For bridged mono operation, both level attenuators must be in the same position. We
recommend you leave them in the 0 dB (fully open) position.
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