Filter Button; Filter Edit Functions - Mackie quad eq Owner's Manual

16. FILTER button

This button provides you with access to the variable
high-pass and low-pass filters of the current EQ chan-
nel. Pressing the FILTER button engages and disengages
these two pass filters at their currently edited settings.
For the high-pass filter, the signal level of the fre-
quency range below the filter frequency is attenuated by
an amount determined by the high-pass filter slope. In
other words, it rolls off the lows (less boom-boom).
The high-pass filter can be used to reduce any low-
frequency effects such as stage rumble, or microphone
handling. In another example, you might have speakers
which do not reproduce frequencies below 60 Hz very
well. You can set the high-pass filter frequency to 60 Hz,
so your amplifiers do not receive much signal level at
frequencies below this, and do not waste power. They
will have more power reserves for the frequency range
your speakers can reproduce well.
For the low-pass filter, the signal level of the fre-
quency range above the filter frequency is attenuated
by an amount determined by the low-pass filter slope. In
other words, it rolls off the highs (less tweeter tribble).
For example, you can reduce the really high frequen-
cies upsetting the local cat population, and protect your
tweeters at the same time.
With both of these filters, you can still adjust the EQ
levels of individual filters as desired.
To get a better idea of the effect of your filter settings,
on your audio, you may want to engage the RTA and see
what's happening.

FILTER EDIT functions

The frequency and slope of the high-pass and low-pass
filters can be adjusted as follows:
1. Press EDIT [13] (blinks) and FILTER (blinks)
to get to the first option shown in the DISPLAY
[20]. Use the KNOB [19] to adjust its param-
eter.
2. Each time you press FILTER, you move to the
next option to be adjusted, The options are as
follows, in the order in which they appear: HPF,
LPF, HPs and LPs.
3. Press the KNOB or EDIT to exit the edit mode.
HPF (High-pass filter frequency)
The KNOB and DISPLAY allow adjustment and
display of the HPF frequency. The range is 20 Hz to
3 kHz
LPF (Low-pass filter frequency)
The KNOB and DISPLAY allow adjustment and
display of the LPF frequency. The range is 1 kHz to
20 kHz
HPs (High-pass filter slope)
The KNOB and DISPLAY allow you to change the
high-pass filter's slope between 12 dB and 24 dB per
octave. (This is the rate of signal attenuation for fre-
quencies lower than the high-pass filter's frequency.)
LPs (Low-pass filter slope)
The KNOB and DISPLAY allow you to change the
low-pass filter's slope between 12 dB and 24 dB per
octave. (This is the rate of signal attenuation for fre-
quencies higher than the low-pass filter's frequency.)
Owner's Manual
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