6
OPERATION
FRONT PANEL CONTROLS
POWER SWITCH
The POWER switch applies and removes power to the unit. Make sure that all equipment after the
CX311 is either off or the outputs are turned all the way down before turning the CX311 on or off.
LOW OUTPUT LEVEL CONTROLS
Each channel of the CX311 has a LOW OUTPUT LEVEL control. These controls are used to trim the
output levels to the LOW OUTPUT jacks on the rear of the unit.
These controls cover the range of –30dB to +10dB of output gain trim, as indicated on the front panel.
In most cases you would set them to 0dB, for flattest response from the crossover. You can use these
controls to compensate for amplifier gain variations or efficiency of your speakers.
LOW CUT FILTER SWITCH
The LOW CUT switch activates a 30Hz high pass filter. There is one for each of the LOW OUTPUT
jacks and one for the SUBWOOFER OUTPUT. This filter is a 2-pole Butterworth design
(12dB/octave). Its response reduces spurious subsonic frequencies, which tightens up the low end
and helps to protect your amplifiers and speakers.
CROSSOVER FREQUENCY CONTROL
Each channel of the CX311 has a crossover FREQUENCY control to set the crossover point for the
high and low frequencies. These controls cover the frequency range of 250 Hz to 6 kHz. All
frequencies below the set frequency will be sent to the LOW OUTPUT and all frequencies above the
set frequency will be sent to the HIGH OUTPUT.
The main crossover filters are 4-pole Linkwitz-Riley designs (24dB/octave). This yields a sharp rolloff
to help protect speakers and the outputs sum to a flat response.
HIGH OUTPUT LEVEL CONTROL
Each channel of the CX311 has a HIGH OUTPUT LEVEL control. These controls are used to trim the
output levels to the HIGH OUTPUT jacks on the rear of the unit.
These controls cover the range of –30dB to +10dB of output gain trim, as indicated on the front panel.
In most cases you would set them to 0dB, for flattest response from the crossover. You can use these
controls to compensate for amplifier gain variations or efficiency of your speakers.
PHASE SWITCH
Each channel of the CX311 has a PHASE switch. These switches are used to switch the polarity
(invert the phase) of the signals going to the HIGH OUTPUT jacks. Normally you would leave these
