13
4. Starting up
4.1 Cabling and switching on
Before connecting to mains, please ensure that your
local mains voltage is
suitable for the voltage of
the device (e.g. 120V in the
USA, 230V in Europe). The
relevant specs and safety
symbols are printed on the
rear side of the unit.
Master-
,
gain-
and
level-
control
should be
zeroed
(over to far left),
all other control
should be in
center
position, the
switches
should be
off = not pressed
.
Connect all cables according to your application and
switch the amplifier on. The green power control LED
indicates operational readiness. LED indicates operatio-
nal readiness.
4.2 Level adjustment
By proper level adjustment you adapt the
MM 200
to your signal sources (guitar pick-ups,
microphones, etc.).
For this purpose keep the master control initially
fully anticlockwise.
Set the line/mic switch (channel 2) to position mic if
you are using a microphone. Position line is suitable
for all types of guitar pickups and most other sour-
ces.
Now gradually increase the appropriate gain setting
as far as possible but without triggering the red clip
indicator, even when you play loud. Thereby you
keep some headroom for unexpected peak levels.
Very strong sources may cause a clipping warning
despite a low gain setting. Such sources can be
attenuated first by pushing the high/low switch
(channel 1).
Finally set the desired volume using the master
control.
• If the gain setting is too low, the amplifier may not
reach the desired volume, or distracting noise may
become noticeable.
• Setting the gain too high causes distorted sound
(clipping). The clip light will warn you before this
happens.
• If you use an instrument with a volume control, start
off with full volume but reduce it if the clip indicator
lights up early and the level adjustment is difficult.
• Please ensure there is always enough battery power
in your (active) pick-up system. Humming and sizzling
may be caused by an empty battery.
• If several inputs are used simultaneously, you also
determine the mixing ratio by the individual gain
settings.
• The gain controls of any unused inputs should stay
fully anticlockwise.
5. Functional characteristics
5.1 Tone control
The tone controls of the
MM
200 are a high-quality
sound modification tool that preserves the natural
tone of instruments and voice and allows you to apply
targeted accentuations.
If bass, middle, and treble are in center position and
the colour switch is not pushed, the tone controls are
neutral and have no influence on the sound.
The amplifier will already provide a very pleasant,
natural sound when all controls are in neutral position,
which you can then principally alter with the colour
filter: This will reduce the midrange and bring out the
trebles. The sound becomes more open and lighter and
is particularly suitable for finger picking techniques.
The tone controls can support or attenuate the effect of
the colour filter (see illustration below).
Monte
-Mute
Foot-
Switch
With colour-filter
(switch pressed)
reduce
treble
to soften possible
harshness.
Without colour-filter
(switch not pressed)
boost
treble
to
brighten the sound.
Please note:
The tone controls have an effect on the signal level. If the
clip indicator flashes more frequently, reduce the level a bit
using the gain control (see also 4.2).
