Preamp Controls
Figure 1: Preamp Section of the front panel
INSERT switch
This switch enables the rear panel insert loop by inserting any device connected to the Send and
Return jacks into the signal path. The insertion point is post-tube, pre-EQ. See page 15 for more
details on the Insert feature.
LOW control
This control varies the gain of the low frequency equalization; the gain range is -15 to +15 dB. The
low frequency filter is a shelving lowpass configuration with a knee frequency of 80 Hz.
MID control
This control varies the gain of the mid frequency equalization; the gain range is -15 to + 15 dB. The
mid frequency filter is a bandpass configuration with variable frequency and switchable bandwidth.
NARROW switch
This switch selects the bandwidth for the mid frequency filter. The default bandwidth is 1.5 octaves;
with the Narrow switch depressed, the bandwidth is 0.5 octaves.
FREQUENCY control
This control selects the center frequency for the mid frequency filter. The frequency range is 100 Hz
to 8 kHz.
HIGH control
This control varies the gain of the high frequency equalization; the gain range is -15 to +15 dB. The
high frequency filter is a shelving highpass configuration with a knee frequency of 12 kHz.
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