The Bass MuRF’s FILTERS
The Bass MuRF’s seven resonant lters have xed center
frequencies and a shelving(lowpass) lter that has a xed cutoff
frequency. These frequencies are shown on the legend underneath
the lters’ sliders. Their frequencies are: 110 Hz(shelving lter),
160 Hz, 240 Hz, 350 Hz, 525 Hz, 775 Hz, 1.2K and 1.8K.
Each lter has a slider that adjusts the gain of that lter. In this
respect, the Bass MuRF resembles a graphic equalizer. When a
lter’s slider is all the way down, the gain for that lter is zero,
and the lter’s output is zero. When the slider is all the way up,
the lter’s output is maximized. The resemblance to a graphic EQ
ends there. The Bass MuRF’s lters have a characteristic that sets
them far apart from a graphic equalizer. A graphic equalizer will
theoretically not color the signal at all when all the sliders are set
to the same level. The Bass MuRF’s resonant lters and shelving
lter on the other hand color the signal a great deal, adding warm
analog resonances at pleasing intervals through out the frequency
spectrum of a bass instrument. We’ll now show how the Bass
MuRF’s lters affect your MF-105B frequency response. We will
always start with this ‘basic’ panel setup, which is:
1) Set each of the lters’
sliders to all the way up.
2) Switch the PATTERN to
Bank A, Pattern 1. Pattern 1
turns off the Animation so you
can hear the effect of just the
lters.
Figure 5 - Basic Settings for checking out the
lters.
