Electro-Voice Mixer Amplifier MA-1206 Manuel utilisateur

Electro-Voice®®

®®

MA-1206 and MA-1212 User Manual

User Manual

MA-1206/MA-1212

Professional Mixer/Amplifiers

Electro-Voice®®

®®

MA-1206 and MA-1212 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

Hig 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

Ot er Rig ts ............................................................................ 13

Appendix B: Safety Guidelines ............................................................. 14

AC Power Supply..................................................................... 14

DC Power Supply .................................................................... 14

Safety Precautions................................................................... 14

Tec nical Specifications ....................................................................... 16

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

Page 2

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.

•Au iliary line level inputs with internal mi ing 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 Electro-Voice MA series of mi er-amplifiers are available with output

power ratings of 60 (MA-1206) or 120 (MA-1212) watts. The MA series

products provide background music and allow paging in environments

such as churches, small businesses, and professional offices.

The MA inputs include 10 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 Au 1 and 2 may include: tape players, compact-disc

players, AM/FM tuners, mi er-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.

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

Page 3

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 e ample 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

(appro imately 200 ohms) or unbalanced high impedance

(appro imately 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.

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

Page 4

Typical Connections

Figure 1:

Typical Connections

Electro-Voice®®

®®

MA-1206 and MA-1212 User Manual

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.

Au iliary 1 and 2: High-level unbalanced sources may be connected to

the Au 1 and 2 jacks on the back panel.

Appropriate sources include a tape player, compact-disc player, AM/FM

tuner, mi er-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.

Page 5

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

Page 6

The set of RCA jacks (R and L) provided on the AUX 1 and 2 inputs are

designed to match to the two outputs of the typical stereo source. The

jacks are in parallel through internal series resistors and mi both

channels. The series resistors are chosen to avoid undesirable loading

effects on the output stage of typical stereo sources.

Plug monaural high-level unbalanced sources into either the R or L

jacks.

Paging: The voice paging signal from a 600 ohm balanced audio paging

line (such as a PBX system) may be connected to the au paging input

on the back panel.

Power Amp In: The Power Amp In jack provides direct access to the

power amplifier. It requires a line- level signal fed through a RCA type

phono plug wired with a single-conductor shielded cable.

Output Connections

The amplifier-can accommodate both Low Impedance and high

impedance constant-voltage speaker loads (25, 70.7, and 100 volt lines).

There are several considerations in the connection of a speaker or

multiple speakers to an amplifier:

1. Matching speaker impedance to the amplifiers rated Impedance: In

general, power amplifiers deliver rated power into a rated load

impedance. Lower impedances reduce the ma imum available power

available at rated distortion. Significantly lower impedances may cause

the amplifiers protection fuses to open, especially at high volume levels.

These low impedances should be avoided.

2. Power loss in speaker wire: The impedance of the speaker connecting

wire would ideally be zero, so all of the amplifier output power can be

delivered to the speaker load. However, the impedance of a longer

speaker wire installation can become a significant proportion of the total

impedance. Thus, part of the amplifier power is lost in the wire and the

power to the load is reduced. Wire impedance is highest for the longest

wire runs and smallest wire sizes.

Table 1 shows the two wire cable (copper) lengths permissible for a

number of wire sizes and speaker impedances to avoid a loss of more

than 0.5 dB. For a 1 dB loss (basically imperceptible), double the wire

lengths. For a 2 dB loss, multiply the lengths by 4.4.

In general, note that high load impedances allow the use of longer,

smaller gauge wiring.

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

3. Balancing relative speaker levels: There is no easy, electrically

efficient way to balance and adjust the sound levels among multiple

speakers in a low impedance installation. Constant-voltage high

impedance systems ease this process because they typically employ

speakers equipped with transformers with multiple input taps marked in

watts.

Low Impedance Speakers. The low impedance ohm output terminal is

provided for direct connection of one or more standard low impedance

speaker systems. For e ample, connect a single speaker system to the

common and 4 ohm terminals. Correct connection of several low

impedance speakers must follow the rules of proper series and parallel

impedance summation.

High Impedance/Constant-Voltage Systems

Installations that require high impedance speaker loads permit smaller

diameter wire for a given power loss in the speaker lines. Usually, low

impedance speakers are still used in such systems, but transformers are

used at the speaker locations to increase the impedance to the desired

value. Multiple transformer taps, labeled in watts, permit easy adjustment

of the individual speaker levels. Use simple parallel connection of the

transformer primaries (inputs). This eliminates the determination of load

impedance and series-parallel speaker connections.

For proper operation, all speakers should have transformers with the

same voltage rating, i.e. 25, 70.7, or 100 volts. The total of all the power

taps should be equal to or less than the amplifiers rated output power.

When the total equals the rated power, the amplifier may deliver rated

power to the load, depending on the input signal levels. Totals less than

the rated amplifier output will not damage the amplifier since the

resultant load impedance is higher than the amplifiers rated impedance

and thus only reduces the power delivered at ma imum amplifier level.

How ever, avoid power totals greater than rated amplifier power, since

the total load impedance drops below the amplifiers rated load.

Preamp Out: The Preamp Out jack provides a line-level mi of the input

signals, fed through a 1/4 inch phone plug wired with a single-conductor

shielded cable.

Use the signal at the Preamp Out jack to feed an e ternal equalizer or

signal processor whose output would connect to the Power Amp In jack.

Page 7

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

Page 8

The preamplifier output may also be used alone to drive an additional

e ternal power amplifier with its own set of speakers. When the Preamp

Out jack is used, the mi ed signal to the internal power amplifier is

interrupted.

The balanced line level XLR output connector is ideal for feeding an

e ternal recording device or assistive listening system. When the rear

panel switch is in the fi ed position, the master volume control does not

affect the level at this line out jack, which permits setting the tape

recorders input level independent of system volume. The tape output is

buffered, so that an improper load will not affect system performance.

Operation

Figure 3:

Front Panel Layout

Front Panel Controls

(Refer to Figure 3)

1. Mute function switch: This switch lets you turn the Voice

Priority or page ducking function on or off of input 1 (1).

2. Au iliary 1&2 : These controls adjust the level of the two stereo

summing au iliary inputs. Input 1-10: These controls adjust the

levels of the 10 multi-use inputs.

3. Music signal monitor output level control: This control is a

screwdriver adjustment and lets you individually set the volume

of a headphone that is connected to the MONITOR OUTPUT

(4) or a small speaker connected to the 1w 8 ohm terminals on

the rear panel (25). Turning the control clockwise increases the

volume of the corresponding source.

Electro-Voice®®

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MA-1206 and MA-1212 User Manual

Page 9

Front Panel Controls (cont )

5. Overload indicator light: When the amplifiers output overloads

the OVER LOAD indicator illuminates and interrupts the output

signal. The output will resume when the volume is lowered or

the offending load is remove from the output line.

6. Power Switch and Power Indicator: This switch supplies power

to the unit. The power indicator lights when power is applied to

the unit.

7. Master: This control adjusts the level of the combined input

signals to the power amplifier.

8. Treble: This control adjusts the high frequency response by

providing up to 7 dB of boost or 12 dB of cut at 10 kHz.

9. Bass: This control adjusts the low frequency response by

providing up to 7 dB of boost or 12 dB of cut at 100 Hz.

Rear Panel Controls and Connections

(Refer to Figure 4)

10. Main cord connector: This connector is for the connection of the

supplied AC line cord.

11. AC fuse: The fuse can only be changed, in the event of a fault or

changing the supply voltage. This service should only be done by

an EV service center.

12. GND screw: In case the main outlet does not provide a ground

conductor, this screw offers the possibility to ground the amplifi-

ers metal parts.

Figure 4:

Rear Panel Layout

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