As the functioning of the MID B/C, HIGH B/C
switches and the TONE control is very complex,
some remarks regarding this novel control stage
will be shown in the following. The frequency
fixed with the TONE control can be further
boosted via the MID B/C switch (in center
position it will be slightly boosted), or cut -
similarly to a semi-parametric equalizer.
Boosts and attenuations are less intense in deeper
frequency ranges than in higher spectra. These
have been determined so as to obtain efficient
results by quick adjustment.
The switch position HIGH cut makes the TONE
control act like a low-pass filter. You can therefore
cut treble that your bass does not produce anyway,
so as to eliminate unnecessary noise.
INPUT socket to plug in a bass guitar.
GAIN control + 3 LEDs to adjust the input level:
CLIP too high,
OK optimum,
LOW too low.
LIMITER 3-way switch + 2-colored LED to
compress the signal within the preamp:
LED green Limiter on,
LED red the signal level is actually
being reduced.
switch in top position on,
centered off,
bottom position on, when graphic EQ is on.
70/140/210/420/7301.2k/2.5k/5k faders for
boosting/cutting the respective frequencies by +/-
12 dB.
EQ ON/OFF switch + LED for
activating/bypassing the graphic EQ (and possibly
the limiter).
LOW B/C 3-way switch + 2-colored LED to
boost/cut low frequencies. In boost position
(LED red) the bottom-end is boosted, in cut
position (LED yellow) it remains unmodified, but
deep mids are attenuated to obtain a clearer
sound (chords, tapping, harmonics, etc.).
MID B/C 3-way switch + 2-colored LED for the
boost (LED red)/cut (LED yellow) of the
frequency determined via TONE control. It will
be slightly boosted when the switch is centered. All
boosts and attenuations are less intense in deeper
frequency ranges than in higher spectra (300 Hz
+6/+12 dB, 14 kHz +15/+20 dB, flat/boost).
HIGH B/C 3-way switch + 2-colored LED to
boost/cut high sound attributes. In boost position
treble is boosted (fixed preset, LED red), in cut
position (LED yellow) the TONE control works as
a low-pass-filter, means that frequencies higher
than the TONE control setting are eliminated.
Moreover the MID-boosts are softened by about
5 dB.
TONE control sets the basic sound characteristics
(frequency control between 300 Hz and 14 kHz).
DI PRE/POST switches the signal lying at the DI
OUT socket PRE (switch in top position) the
unmodified bass signal is retained, POST (switch
in bottom position) the tone controls and the
effects loop are inserted into the signal path.
DI OUT symmetrical output for supplying a stage
or studio mixing console.
PHONES socket for connecting a headphone
(min 200 Ω).
MUTE switch + LED cuts the signal from all
outputs, except from the PHONES socket, and
activates the TUNER output (rear panel).
MASTER control determines the mains level.
POWER switch for turning the amplifier on and
off.
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