CLB Active Subwoofer User Manual
Connection
Connect balanced or unbalanced line level signal(s) from sound source or audio mixer to the L+R combo inputs using good quality XLR
or 6.3mm jack leads. Connecting to either of these will work for a mono input.
Connect the OUTPUT XLR to any further active speakers or amplifiers that are to be fed the same signal.
Connect the supplied mains cable from the IEC connector to a suitable mains outlet, ensuring correct voltage and adequate current
capacity.
Operation
With the INPUT LEVEL control (1) turned fully down, switch on the power switch (8). The power LED will illuminate.
Ensure a signal is playing to the input(s) and gradually increase the INPUT LEVEL control (1) until the required output volume is
reached.
The power LED doubles as a clip indicator, turning to red when the amplifier signal is clipping. It is OK for the clip indicator to light red
momentarily on peaks in the audio but if the LED shows red for longer periods, it will be necessary to turn down the input level.
Adjusting the FREQUENCY control (3) varies the cutoff frequency of the high cut filter. Rotate left for lower frequency and right for
higher frequency. Remember that lower frequency settings will cut out more of the mid frequencies and input level may need to be
increased to compensate.
The INV switch reverses polarity when pressed in, which may help to avoid low frequency feedback or phase align 2 subs facing
toward each other. The correct setting for this switch is whichever produces the best output or lowest feedback and is subject to trial
and error.
The GND/LIFT switch can be used if there is noise introduced into the signal from a poor mains earth.
Otherwise, the best position for this switch is GND, which connects signal ground to mains earth.
Before powering down, turn the channel gain controls fully down to avoid loud noises when switching off.
