Selecting Stereo, Parallel, Or Bridge Mode; Setting Low Frequency Filters - QSC RMXa Serie Manual Del Usuario

Selecting Stereo, Parallel, Or Bridge Mode

The amplifier can be set for normal Stereo operation, Parallel input Mode, or Bridge Mono Mode.
Stereo Mode- Each channel remains independent. The amplifier may be used for two different signals.
Stereo Mode - Switches 4, 5, 6 and 7 are all set to the LEFT position.
Parallel Mode - This setting connects both inputs together. One signal feeds both channels. Each
channel's Gain control and loudspeaker connection remain independent.
Parallel Mode - Switches 4, and 5, are set to the RIGHT position. Switch 6 and 7 are set to the LEFT
position
Bridge Mode- This setting combines both channels into a single channel with twice the output power. Use
only the first channel's input and Gain control. Set the second channel's Gain control at minimum. The load
must be rated for the higher output power, and is connected as shown in the Outputs section.
Bridge Mode- Switches 4, 5, 6,7 and 8 are all set to the RIGHT position and Switch 10 is set to the LEFT
position.
CAUTIONG!: Do not connect different inputs to each side of a channel pair
when operating in Parallel or Bridge Mode.
EN

Setting Low Frequency Filters

Each channel has a 12dB per octave Low Frequency Filter to prevent cone overexcursion,
making more power available for the loudspeaker's rated frequency range. This reduces
distortion and prevents amplifier overload.
The Filter should only be turned off for driving subwoofers with special low frequency
capability. Otherwise, unless you have filtering in the signal path preceding the amplifier,
use the Low Frequency Filter. The loudspeaker's documentation will specify the low
frequency limit.
Each channel has its own switches for LF Filter on/off and frequency selection.
• Channel 1 uses switches 2,3.
• Channel 2 uses switches 8,9.
• Switches 3 and 8 turn the LF Filter ON.
• Switches 2 and 9 select 30Hz or 50 Hz.
7
— Figure 5 — — Figure 6 —
USE CH1 INPUT, CLIP LIM, AND
FILTERS. USE CH1 GAIN CONTROL
TO ADJUST LEVEL. SWITCH OFF
THE CH2 CLIP LIMAND FILTER.
SET CH2 GAIN OFF (-∞ ).
USE THE BRIDGE MONO SPEAKER
CONNECTION.
— Figure 7 —
— Figure 8 —