User manual

Master Filter
Descripon
The Master Filter secon consists of a High-Pass Filter (HPF), a Low-Pass Filter (LPF),
and a Resonance control (RES) to adjust the sharpness of the High-Pass lter. Unlike a
Voltage-Control Filter system, (VCF) the lter elements are passive in order to
minimise distoron and eliminate DC voltage breakthrough and because the lter is
passive there is also zero thermal frequency dri. The Master Filter can be used as a
swept frequency performance eect, or as pre-set frequency mix tool to instantly cut
the low or high frequencies of any channel routed to the Filter.
HPF RES - Adjusts the sharpness (Q) of the High-Pass Filter. Set to minimum the HPF
will have a smooth roll o with a low Q. Turning the control clockwise will
progressively increase the Q of the HPF and the gain at the cut-o point - see graph
below for illustraon. Because high Q levels at low frequency can damage the PA
system, high Q sengs are automacally reduced as the HPF control is turned counter
clockwise.
LPF - Progressively aenuates the high frequency content as it is rotated counter
clockwise. A virtually at frequency response up to about 20kHz is achieved with the
control fully clockwise. With the control set fully counter clockwise all frequencies
above 500Hz will be progressively aenuated. The Q of this lter is xed and is not
eected by the resonance control.
HPF - Progressively aenuates the low frequency content as it is rotated clockwise.
A at frequency response down to 30Hz is achieved with the control fully counter
clockwise. With the control set fully clockwise all frequencies below 1kHz will be
aenuated. The Q of this lter is adjusted by the Resonance control.
MASTER FILTER ON - Turns the Master Filter ON. This switch is controlled by the zero-
crossing detecon system so can be used as a performance eect. The zero crossing
system minimises audible clicks and switching arfacts when roung channels to the
Master Filter or switching the lter ON.
4
This graph illustrates how the resonance of the High-Pass Filter is automacally
reduced as the frequency is lowered