MFJ MFJ-384 User Manual

MFJ-384

Amplified Communications Speaker

General Information and Operating Instructions

Thank you for purchasing the MFJ-384 Amplified Communications
Speaker. The MFJ-384 is a self-contained, portable amplified communications
speaker that gives you powerful audio with its built-in power amplifier. Please
read this page in its entirity prior to operation of the MFJ-384.

POWER REQUIREMENTS:

The MFJ-384 can be powered by two 1.5volt C size batteries or by an external
power adaptor. The power adaptor should have an output of 6 Vdc and polarity
with the center pin negative.

BATTERYRY INSTALLATION:

• Remove the battery cover.

• Insert two fresh 1.5 volt C size batteries according to the polarity marks inscribed

inside the battery compartment.

• Replace the battery cover.

• The LED on the front of the MFJ-384 will be dimly lit when the power switch is in

the “OFF” position.

• The LED on the front of the MFJ-384 will be brightly lit when the power switch is

in the “ON” position.

Operating Instructions

When you first open the MFJ-384, the audio input connector will be inside the
battery compartment. Open the battery cover to release the audio input connector.

Operation as a Non-amplified Speaker

• Simply connect the 3.5mm audio input plug to the audio source.

• The power switch on the back of the MFJ-384 should be in the “OFF” position.

• When the MFJ-384 is operated in non-amplified mode, the “Volume” and “Tone”

controls are inactive. The volume level should be adjusted from the audio source.

Operation as an Amplified Speaker

• Connect the 3.5mm audio input plug to the audio source.

• Turn power switch on the back of the MFJ-384 to the “ON” position.

• Adjust the “Volume” control to a suitable level. Turn the knob clockwise to increase

the volume or counter-clockwise to decrease the volume.

• Adjust the “Tone” control to a suitable level. Turn the knob clockwise to increase

the treble or counter-clockwise to increase the bass of the audio output.

Note: In amplified mode, it may be necessary to decrease the audio output from
the signal soucre to prevent distortion.

MFJ-384

Amplified Communications Speaker

General Information and Operating Instructions

Thank you for purchasing the MFJ-384 Amplified Communications
Speaker. The MFJ-384 is a self-contained, portable amplified communications
speaker that gives you powerful audio with its built-in power amplifier. Please
read this page in its entirity prior to operation of the MFJ-384.

POWER REQUIREMENTS:

The MFJ-384 can be powered by two 1.5volt C size batteries or by an external
power adaptor. The power adaptor should have an output of 6 Vdc and polarity
with the center pin negative.

BATTERYRY INSTALLATION:

• Remove the battery cover.

• Insert two fresh 1.5 volt C size batteries according to the polarity marks inscribed

inside the battery compartment.

• Replace the battery cover.

• The LED on the front of the MFJ-384 will be dimly lit when the power switch is in

the “OFF” position.

• The LED on the front of the MFJ-384 will be brightly lit when the power switch is

in the “ON” position.

Operating Instructions

When you first open the MFJ-384, the audio input connector will be inside the
battery compartment. Open the battery cover to release the audio input connector.

Operation as a Non-amplified Speaker

• Simply connect the 3.5mm audio input plug to the audio source.

• The power switch on the back of the MFJ-384 should be in the “OFF” position.

• When the MFJ-384 is operated in non-amplified mode, the “Volume” and “Tone”

controls are inactive. The volume level should be adjusted from the audio source.

Operation as an Amplified Speaker

• Connect the 3.5mm audio input plug to the audio source.

• Turn power switch on the back of the MFJ-384 to the “ON” position.

• Adjust the “Volume” control to a suitable level. Turn the knob clockwise to increase

the volume or counter-clockwise to decrease the volume.

• Adjust the “Tone” control to a suitable level. Turn the knob clockwise to increase

the treble or counter-clockwise to increase the bass of the audio output.

Note: In amplified mode, it may be necessary to decrease the audio output from
the signal soucre to prevent distortion.