Mackie Spike User Manual page 52

Parametric EQ continued
Shelf 1 and Shelf 4 buttons
Click these buttons to convert band 1 into a low-fre-
quency shelving fi lter, and band 4 into a high-frequency
shelving fi lter, with gain and frequency control param-
eters (no Q adjustment).
Gain sliders
These sliders control the gain for each node, with a
range from –15 dB to +15 dB.
Frequency sliders
These sliders control the center frequency for each
band (or corner frequency, if SHELF 1 or SHELF 4 is
selected). Each band has a frequency range from 20 Hz
to 20 kHz.
Q sliders
These sliders control the Q (quality factor) for each
band, with a range from 0.1 to 16. The larger the
number, the narrower the band of frequencies that are
affected by the fi lter (Q=freq/bandwidth).
HP/LP display (zoom view only)
The HP/LP display shows any fi ltering applied to the input signals before the DSP section. Use it
wisely with the EQ display to gauge the overall EQ applied. Marvel how the display changes when
the LP and HP fi lter frequencies are adjusted in the Overview section (see page 41).
Nodes
HP/LP
display
Shelf 1
Shelf 4
Gain
Freq
Quality
Band 1
Parametric Equalizer with Shelf 1 and 4 on
Band 2 Band 3 Band 4
User's
Guide
52