User Manual Viper Musical Instrument Amplifier Mf-105B [7/29 Pages]

Viper musical instrument amplifier MF-105B

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.