Electro-voice MA-606 User Manual
User Manual
MA-606
Professional Mixer/Amplifier
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Electro-Voice
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MA-606 User Manual
Table of Contents
Typical Connections ............................................................................... 3
Features ................................................................................................. 2
Description ............................................................................................. 2
Installation .............................................................................................. 3
Grounding .................................................................................. 3
Ventilation .................................................................................. 3
Key Input Connections ............................................................... 3
Typical Connectons ................................................................... 4
Output Connections ................................................................... 6
High Impedance/Constant-Voltage Systems .............................. 7
Operation ................................................................................................ 8
Front Panel Controls .................................................................. 8
Rear Panel Controls and Connections ....................................... 9
Appendix A: Limited Warranty .............................................................. 13
Exclusions and Limitations....................................................... 13
Obtaining Warranty Service ..................................................... 13
Other Rights ............................................................................ 13
Appendix B: Safety Guidelines ............................................................. 14
AC Power Supply..................................................................... 14
DC Power Supply .................................................................... 14
Safety Precautions................................................................... 14
Technical Specifications ....................................................................... 16
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Electro-Voice
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MA-606 User Manual
Features
• Level controls for each input and a master volume control.
• Individual bass and treble tone controls.
• Automatic muting circuit with threshold adjustment.
• 600 ohm transformer-isolated line input for paging, with
automatic muting of all other inputs.
• Low distortion.
• Output protection circuit.
• Auxiliary line level inputs with internal mixing for stereo source.
• Balanced line level output.
• Insertion point between preamp and amplifier.
• Phantom power on all microphone inputs enables microphones
to be used without separate power supplies.
Description
The MA series products provide background music and allow paging in
environments such as churches, small businesses, and professional
offices.
The inputs include 4 combination balanced or unbalanced Microphone/
AUX level connections, 2 stereo AUX summing inputs, telephone paging
and Power Amp In connections. Inputs to Mic 1 can be set to
automatically mute the other Mic and AUX level input channels.
Input sources to Aux 1 and 2 may include: tape players, compact-disc
players, AM/FM tuners, mixer-preamplifiers or wireless microphones.
The telephone paging input accepts the signal from a standard 600 ohm
paging line.
The Power Amp In jack, along with the Preamp Out jack, is provided to
insert an equalizer or other signal processing device before the power
amplifier.
The amplifier includes protection circuitry to prevent damage from either
open or shorted speaker lines.
An adjustable automatic muting circuit mutes all other inputs when the
paging input is activated.
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Electro-Voice
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MA-606 User Manual
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Installation
To avoid hum in the output, be certain that all input cables are physically
separated from power wiring and transformers. Speaker cables should
also be kept away from input cables and power cables.
An example of what sources and output devices would be connected to
this unit is shown in Figure 1.
Grounding
Ground the chassis of the unit by using the ground terminal located on
the back panel. For the best grounding, connect the amplifier to an earth
ground such as a cold water pipe or ground rod. If additional equipment
is installed along with the amplifier, make sure their chassis are
connected together to reduce noise and hum.
Ventilation
To remove the heat generated by the power amplifier, provide ample
ventilation around the unit. Avoid blocking or impeding the vent slots in
the cabinet.
Locate the unit where it is free from direct sunlight, humidity, dust and
vibration.
Key Input Connections
Microphones. The Mic inputs are for use with balanced Low Impedance
(approximately 200 ohms) or unbalanced high impedance
(approximately 20k ohms) microphones. For high impedance
microphones, cables should be as short as possible in order to avoid
loss of High Frequency response. The results will vary with the
microphone and cable capacitance. However, a limit of 30 feet is
recommended.
The Mic inputs may be accessed by either XLR connectors or ¼ phone
plugs.
Figure 2 shows the wiring configurations of both unbalanced and
balanced microphones using either ¼ or XLR type connectors.
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Electro-Voice
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MA-606 User Manual
Typical Connections
Electro-Voice
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MA-606 User Manual
Figure 1:
Typical Connections
Page 4
Figure 2:
XLR and Jack Inputs
Figure 2 shows the wiring configurations of both unbalanced and
balanced microphones using either ¼ or XLR type connectors.
Phantom Power: Phantom power allows the use of microphones without
separate power supplies on the Mic inputs. When phantom power is on,
24 V dc is produced at pins 2 and 3 on the Mic inputs. To enable
phantom power simply move the selector switch to the 24v position
above the desired input connector.
Microphone auto muting input: When a microphone or other source is
connected to input 1 and the front panel mute switch in the on position,
advance the threshold control to the point where the typical voice, and
not noise in the room, will operate the mute circuit. The microphones on/
off switch may be on, with the actual voice announcement triggering the
mute. If you want to defeat the muting function, place the mute switch in
the off (defeat) position.
Auxiliary 1 and 2: High-level unbalanced sources may be connected to
the Aux 1 and 2 jacks on the back panel.
Appropriate sources include a tape player, compact-disc player, AM/FM
tuner, mixer-preamplifier, wireless microphone or turntable equipped with
a ceramic or crystal cartridge. Use a single-conductor shielded cable.
Turntables usually have a separate ground wire. Connect this wire to the
ground terminal on the back panel to minimize hum.
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Electro-Voice
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MA-606 User Manual
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