5
MicroBass-III Series
Setup & Maintenance
Setup:
To insure proper operation and to avoid potential
safety hazards, place the unit on a firm, level surface.
Do not plug or unplug the instrument or speaker
cable while the amplifier power is on. Rack-mount-
ing this unit is not recommended.
Heat & Ventilation:
For proper ventilation, make sure there is at least
8 inches (20cm) of clearance around the sides, top,
back and front of the amplifier. Avoid using in
extremely hot or cold locations and areas that are
exposed to direct sunlight, or near heating equip-
ment. The heat sink fins and ventilation slots that
form part of the enclosure are specially designed to
displace heat generated by the amplifier. Placing
other electronic equipment near these heat-dissi-
pation systems may possibly affect the long-term
reliability of both your amplifier and the other
equipment.
Moving the Unit:
Before moving the unit, be certain to disconnect all
cables. Make sure that you disconnect the unit from
the AC outlet. If Traveling with the unit frequently,
we recommend a road case or gig bag to protect it
from scratches and road wear.
Cleaning & Maintenance:
Clean only with a dry cloth. Never use benzene,
thinner, alcohol, or other volatile cleaning agents.
Do not use abrasive cleaners, as they may damage
the finish of metal parts. Avoid spraying insecti-
cides near the unit. No other maintenance should
be necessary.
Quick Start
Plug It In:
Set the power switch to Off and connect the sup-
plied power cord, from the amplifier’s AC recep-
tacle, to an AC power outlet of proper voltage
and power rating (see safety information on page
3 for details).
Connect Your Cabinets:
Connect your external speaker cabinets to the
amplifier outputs marked SPEAKER OUTPUTS.
If you are using two 8 ohm or one 4 ohm external
cabinet with an MB Series combo, turn the internal
speaker off by pressing the switch out. Be sure not
to exceed the recommended speaker load below.
Maximum Recommended Speaker Loads:
EXTERNAL
INTERNAL TOTAL
SPEAKER(S)
SPEAKERS LOAD
1 x 8 ohms
on
= 4 ohms
1 x 4 ohms
off
=
4 ohms
2 x 8 ohms
off
=
4 ohms
If you are using a Gallien-Krueger HMS (Horn
Management System) compatible speaker cabinet,
set the cabinet’s bi-amp switch to Full Range.
Initial Front Panel Control Settings:
Set all EQ controls and the Boost control to 12
o’clock (The MBS does not have a boost control).
The Voicing Filters should be turned all the way
down to get a flat response. Set the Input and
Master Volumes at 0.
Connect Your Bass:
Using an instrument (shielded) cable, connect your
bass to the Input jack and press the power switch
on.
Input and Master Volume Settings:
Set the master to 12 o’clock then gradually increase
the preamp volume control to a comfortable listening
level. If you hear distortion at low volume settings,
try pressing in the -14dB pad. If it’s still distorted,
try turning the volume down on your bass.
Setup & Quick Start
