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Gallien-Krueger MicroBass-III
Series オーナーズマニュアル

Rear Panel Controls

1 Power On/Off Switch: Press in to turn the amplifier

on, out to turn it off. Power/Protect LED is on when the

amplifier is on.

2 AC Receptacle: The power cord is detachable and

plugs in here.

3 Speaker Output: Power amp ¼" jack outputs. It

delivers 150W into 4 Ohms or 100W into 8 Ohms.

4 Internal Speaker On/Off Switch (Combo Only):

Turns the internal speaker off for private headphone lis-

tening or to allow the internal power amplifier to drive

an external speaker load of 4 ohms.

5 Effects Return Jack (MBE Only): When the Return

jack is used, the Effects Loop is in series. All of the signal

goes through the Effects Loop.

6 Effects Send Jack (MBE Only): Send and return

jacks provided for the insertion of effects after the EQ,

but before the boost section.

7 Footswitch Jack (MBE Only): Use the RF2 Foot-

switch to turn on/off the Boost and Chorus effects.

8 Direct Outputs (MBE Only): A pair of electronically

balanced low Z outputs, for sending a separate left and

right mic level signal to a PA system. Pre/Post Switch-

able.

9 Ground/Lift (MBE Only): This switch disconnects

the ground on the balanced, XLR output to eliminate

hum and buzz when connecting to equipment that is on

a different ground system.

10 Direct Out Mode Switch (MBE Only): When Mode

1 is selected, XLR Right is Mono Post and XLR Left is

Mono Pre. When Mode 2 is selected, the Direct Outs are

Post Left/Right for Stereo Chorus output.

11 Line Out: Provides a line level signal (post Boost)

for interfacing with outboard power amplifiers or an

external DI Box.

MicroBass-III Series

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Internal/External Speakers

The MB-III Series combos feature one 8 Ohm, 12"

low resonance speaker, which delivers surprising

low-end response and volume for it's size. While it

works great for electric bass, the MB Series combo is

particularly well suited for acoustic upright bass.

Driving External Cabinets:

The MB Series combo electronics are identical to

the MB Series heads and are rated for the same

maximum power output and speaker load (150W

into 4 Ohms or 100W into 8 Ohms). Maximum

power is achieved by connecting one 8 Ohm ex-

tension cabinet such as the 112MBX in addition to

the combo's internal 8 Ohm speaker load. To drive

more than one extension cabinet, the combo's in-

ternal speaker can be disconnected by pressing the

Internal Speaker switch on the back panel. Below

is a detailed description of the maximum loads the

combos can drive.

Maximum Recommended Load:

Internal Speaker On:

One 8 Ohm extension cabinet.

Internal Speaker Off:

One 4 Ohm, or Two 8 Ohm extension cabinets.

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