ProAudio MZA8412 User manual

USER MANUAL
EN
MZA8412
AMPLIFIER MIXER ZONE
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
0 0 0 0 0 0 0 0 0 000
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4MUTE MUTE MUTE MUTE
0 +10
LEVEL
CH 1
CH 2
CH 3
CH 4
POWER
ON
OFF
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 CH 7 CH 8 MASTER 4MASTER 3
MASTER 2
MASTER 1
-10
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
SIG
-15 +15
HIGH
-15 +15
HIGH
-15 +15
HIGH
-15 +15
HIGH
-15 +15
-15 +15
LOW LOW LOW LOW
-15 +15 -15 +15 -15 +15
MID MID MID MID
-15 +15 -15 +15 -15 +15
4CH MIXER AMPLIFIER
MZA8412

REV.02-06/21
All rights reserved by Music & Lights S.r.l. No part of this instruction manual may be
reproduced in any form or by any means for any commercial use.
In order to improve the quality of products, Music&Lights S.r.l. reserves the right to modify the
characteristics stated in this instruction manual at any time and without prior notice.
All revisions and updates are available in the ‘manuals’section on site www.musiclights.it

3
MZA8412
CONTENTS
4
4
5
5
7
8
9
10
11
Safety
General instructionsGeneral instructions
Warnings and installation precautionsWarnings and installation precautions
1 Introduction
1. 1 Description1. 1 Description
1. 2 Technical specications1. 2 Technical specications
2 Operating elements and connections
2. 1 Front Panels2. 1 Front Panels
2. 2 Rear Panels2. 2 Rear Panels
2. 3 Block diagrams2. 3 Block diagrams
2. 4 Specications2. 4 Specications
3 G3 General criteria for installation of soundal criteria for installation of sound
systemssystems
• MZA8412
• User manual
Packing content:

4MZA8412
Before carrying out any operations with the unit, carefully read this instruction manual, and keep it with cure
for future reference.
It contains important information about the installation, usage and maintenance of the unit.
SAFETY
General instruction
• The products referred to in this manual conform to the European Community Directives and are there-
fore marked with .
• The unit is supplied with hazardous network voltage (230V~). Leave servicing to skilled personnel only.
Never make any modications on the unit not described in this instruction manual, otherwise you will
risk an electric shock.
• Connection must be made to a power supply system tted with ecient earthing (Class I appliance ac-
cording to standard EN 60598-1). It is, moreover, recommended to protect the supply lines of the units
from indirect contact and/or shorting to earth by using appropriately sized residual current devices.
• The connection to the main network of electric distribution must be carried out by a qualied electrical
installer. Check that the main frequency and voltage correspond to those for which the unit is designed
as given on the electrical data label.
• This unit is not for home use, only professional applications.
• Make certain that no inammable liquids, water or metal objects enter the xture.
• Do not dismantle or modify the xture.
• All work must always be carried out by qualied technical personnel. Contact the nearest sales point for
an inspection or contact the manufacturer directly.
• If the unit is to be put out of operation denitively, take it to a local recycling plant for a disposal which
is not harmful to the environment.
Warnings and installation precautions
• This product in combination with amplier, may be capable of producing dangerous sound levels that
could cause permanent hearing loss. Do not operate for a long period of time at high volume level or
at a level that is uncomfortable.
• If this device will be operated in any way dierent to the one described in this manual, it may suer
damages and the guarantee becomes void. Furthermore, any other operation may lead to dangers like
short circuit, burns, electric shock, ect.
• Do not install the xture near sources of heat.
• The xture must be located in a place where a proper ventilation or thermal dissipation is not impeded.
Do not install the xture in a conned space.
• The output level of the amplier must never exceed the marked sensitivity.
• Do not link the output of any amplier channel back into another channel’s input. Do not parallel or
series connect an amplier’s output with any other amplier’s output.
• Make sure that the signal is correctly connected to the amplier’s input channel and set to proper input
mode.
• Please turn o the power switch before pulling o the power cord.
• Before starting any maintenance work or cleaning the unit, cut o power from the main supply.
• When cleaning unit, please do not use solvents such as acetone or alcohol, since they may damage the
of the unit outer nish and the printings on the panels.
• This product was designed and built strictly for the use indicated in this documentation. Any other use, not expressly
indicated here, could compromise the good condition/operation of the product and/or be a source of danger.
• We decline any liability deriving from improper use of the product.
WARNING!

5
MZA8412
- 1 - INTRODUCTION
1.1 - DESCRIPTION
MZA8412 is a 4 zone mixer, 2U amplied rack, equipped with 8 inputs and 4 assignable outputs.
FEATURES
• It is suitable for installation where a specic sound is required in dierent areas.
• The 1,2,3,4, mic inputs have phantom power and priority function.
• Gain adjustment trimmer on each channel and 3-band tones control for 1-4 channels.
• Outputs with LED indicators and 2-band tones control.
• Zone audio monitoring through transducer on the front panel.
• Remote zone control with WP-1.
1.2 - TECHNICAL SPECIFICATIONS
AMPLIFIED MATRIX MIXER
• Channels: 8 input - 4 output
• Circuit class: digital, without output transformer
OUTPUT
• Power at constant voltage (70/100V): 4x120W
• AUDIO SPECIFICATIONS
• Frequency responce: 20- 20000Hz @ 8 Ohm (±0.5 dB)
• THD+N: <0.1%
• Input impedance: 20kΩ
• Signal/Noise rate: >90dB
POWER SUPPLY STAGE
• Type: Switching
• Operating voltage/frequency: 100/240V, 50/60Hz
PROTECTIONS
• Output: Soft-start, short circuit, DC, overheat
FUNCTIONS
• Input sensitivity: mic. (-50dB ~ -6dB), line (-30dB ~ +14dB)
• Remote control: 0dB/600Ohm balanced
• Tone controls input: 80 Hz, 2.5kHz, 12kHz (±15dB)
• Tone controls output: 80 Hz, 12kHz (±15dB)
• Phantom power: ch1 - ch2/3/4 +15
INDICATORS
• Indicators: sig, peak for each in and sig, -20dB, -10dB,0dB - clip for each out
INPUT/OUTPUT CONNECTORS
• Input signal: XLR/Jack bal. pin RCA unbal
• Output signal: molex
• Data: RJ-45
• Power connection: VDE

6MZA8412
88
420
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
0 0 0 0 0 0 0 0 0 000
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4MUTE MUTE MUTE MUTE
0 +10
LEVEL
CH 1
CH 2
CH 3
CH 4
POWER
ON
OFF
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 CH 7 CH 8 MASTER 4MASTER 3
MASTER 2
MASTER 1
-10
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
SIG
-15 +15
HIGH
-15 +15
HIGH
-15 +15
HIGH
-15 +15
HIGH
-15 +15
-15 +15
LOW LOW LOW LOW
-15 +15 -15 +15 -15 +15
MID MID MID MID
-15 +15 -15 +15 -15 +15
4CH MIXER AMPLIFIER
MZA8412
Fig.1Technical drawing
PHYSICAL
• Cooling: heat sink without fan
• Dimensions (WxHxD): 482x88x320mm
• Rack unit: 2
• Weight: 9kg

7
MZA8412
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
PEAK
SIG
0 0 0 0 0 0 0 0 0 000
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4MUTE MUTE MUTE MUTE
0 +10
LEVEL
CH 1
CH 2
CH 3
CH 4
POWER
ON
OFF
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
HIGH
-15 +15
LOW
-15 +15
CH 1 CH 2 CH 3 CH 4 CH 5 CH 6 CH 7 CH 8 MASTER 4MASTER 3
MASTER 2
MASTER 1
-10
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
-10
SIG
PROT
CLIP
0
SIG
-15 +15
HIGH
-15 +15
HIGH
-15 +15
HIGH
-15 +15
HIGH
-15 +15
-15 +15
LOW LOW LOW LOW
-15 +15 -15 +15 -15 +15
MID MID MID MID
-15 +15 -15 +15 -15 +15
4CH MIXER AMPLIFIER
MZA8412
1 2 3 7 15 16
12
8 9
4 5 6 10 11 14 13
Fig.2
- 2 - OPERATING ELEMENTS AND CONNECTIONS
2.1 - FRONT PANEL
1. INPUT CHANNEL EQ CONTROLS: These controls allow to equaliza the input signal from -15dB to
+15dB at 80Hz(LOW),2.5kHz(MID) and 12.5kHz(HIGH) for CH1~CH4.
2. SIGNAL INDICATORS: These indicators show current input signal on the each input channels.
3. PEAK INDICATORS: These indicators warn against overload shortly on the each input channels. We
would like to recommend for users to adjust TRIM control on the rear panel when PEAK indicators are
ickering to make best performance.
4. INPUT CHANNEL FADER: These allow to adjust for each input level.
5. OUTPUT CHANNEL SELECTORS: These selectors allow to route each input signal through out to
selected output channels.
6. OUTPUT CHANNEL EQ CONTROLS: Output channels have two band equalizer which is adjustable
over a wide range as follow. HIGH : ±15dB at 12KHz / LOW : ±15dB at 80Hz
7. OUTPUT LEVEL METER: These indicators show current output level.
8. CLIP INDICATORS: These indicators warn against overload shortly on the each output channels. We
would like to recommend for users to adjust FADER control when CLIP indicators are ickering to make
best performance.
9. PROTECT INDICATORS: These indicators show to be protected ampliers due to over current or over
heat.
10. MUTE SWITCH: These buttons allow to mute for each output channels.
11. OUTPUT FADER: These faders allow to adjust the level for each output channels.
12. POWER INDICATOR: This indicator lights when power switch is turned on.
13. POWER SWITCH: This button is power on/o switch.
14. MONITOR SWITCH: These switches allow you to monitor each output channel through monitor
speaker.
15. MONITOR OUTPUT CONTROL: This control allow to adjust the monitor level of monitor speaker.
16. MONITOR SPEAKER

8MZA8412
2 4 6
7
3 51
1. AC POWER INPUT CONNECTOR A correct capacity of fuse and power cable should be applied. Please
make sure the value of fuse before replacing.
2. REMOTE INPUT These RJ45 jacks allow to connect with WP1(wall control panel) for adjusting volume
and inserting music source of remote area.
LINE
0 10
5
ACTIVE
MIC
WA LL CONTROL
WP1
VO L
ON
2.2 - REAR PANEL
WP1 WALL CONTROL
Features
Wall Control Panel for MZA8412 and MZX84.
Controls
• Volume control for Wall Panel Mic and Line input or Remote main set
source.
• Push Switch for Wall panel input or Remote main set source.
Connectors
• Input : XLR for Mic & RCA for Line.
• Output : RJ 45 to connect with Remote main set on the rear.
NOTE: possible to use only dynamic microphones.
Fig.3
3. AMPLIFIER OUTPUTS These amplier output blocks provide 100V constant voltage output for com-
mercial and industrial use.
4. TRIM CONTROLS These controls allow to accept variable input level. They have 44dB adjustable range
as -50dB to -6dB for microphone input channels and -30dB to +14dB for line input channels.
5. SIGNAL INPUTS This amplier provide several connectors for signal input and these connectors allow
easy connection. The channel 1~4 are balanced line and microphone input and channel 5~8 are mono
line input.
6. PRIORITY SWITCH All other input signals are muted by the input signal of channel 1 automatically
when this switch pressed on.
7. PHANTOM POWER SWITCH The phantom power can be provided to each microphone input for using
condenser microphone.

9
MZA8412
2.3 - BLOCK DIAGRAMS
Fig.4

10 MZA8412
2.4 - SPECIFICATIONS
Technical data MZA8412
RMS Output power 120W X 4
Constant impedance output 83 Ohm
Constant voltage output 100V
Input sensitivity/ impedence mic input - 50dB~ - 6dB / 20KΩ Balanced
Input sensitivity/ impedence line input -30dB~ + 14dB / 20KΩ Balanced
Input connections XLR, Mic 1-4, 6.3mm jack for line 1 - 8, RCA
for Line 1-4, Remote control RJ45 input 1-4
Output connections Molex output 1-4
Frequency response 20/20.000Hz (±1dB)
Distortion (THD) <0.1% (1KHz)
Tone controls input 80 Hz, 2.5kHz, 12kHz (±15dB)
Tone controls output 80 Hz, 12kHz (±15dB)
Power supply AC 230 Volt, 50~60Hz - DC 24V
Rack units 2U
Phantom power +15VDC
Dimensions (WxHxD) 420x88x320 mm
Weight 9 kg
Technical data WP1
Output Level/Impedance 1V/600 Ω Balanced 1V/600 Ω Balanced
Input sensitivity / Impedance Mic Input - 50dB / 20KΩ Balanced
Line Input -0dB / 30KΩ Balanced
Frequency Response (-1dB) 20Hz - 20kHz 20Hz - 20kHz
T.H.D < 0.1% < 0.1%
Hum & Noise EIN > 129 dB
Residual > 100dB
Power Source DC ±15V DC ±15V
Weight (Net) 0.5 kg 0.5 kg
Dimensions (W x H x D) 80 x 80 x 50mm

11
MZA8412
- 3 - GENERAL CRITERIA FOR INSTALLATION OF SOUND SYSTEMS
INTRODUCTION
This guide represents a quick introduction to the criteria for the installation of a sound system at constant
voltage or constant impedance.
A sound system must be made by qualied personnel only, who must evaluate the needs of the user and the
environmental characteristics of the spaces to be covered, select the speakers according to the spaces and
the type of message to be broadcasted (ie: speech / music ), identify the suitable amplier model to drive the
complex of all the speakers and having an adequate number of inputs, evaluate the proper connection for the
speakers and determine the section of the wiring.
CONSTANT VOLTAGE SYSTEMS
In terms of selection of speakers and their connection it’s necessary to evaluate whether to use normal speak-
ers with 4/8/16Ohm impedance or speakers with transformer. The decision is usually inuenced by the desti-
nation of the system (supermarket, disco , pub, house, ...) and by the number of speakers to employ. Constant
voltage speakers are normally used into situations where it is necessary to install several speakers with low
power to get a homogeneous distribution of audio and overall low volume. The classic example is the sound
installation in airports or supermarkets. In these situations several speakers are usually placed within a short
distance between them, normally a volume low enough to not disturb and a frequency covering the entire
area with same sound pressure.
DIFFERENCES BETWEEN 4/8/16 OHMS SYSTEMS AND CONSTANT VOLTAGE SYSTEMS
The 4/8/16Ohm systems are aected by problems of impedances:
• speakers connected in “series”mode add their impedance (example: 4Ohm + 4Ohm = 8Ohm)
• speakers connected in “parallel” mode divide their impedance (example: 8Ohm // = 8Ohm 4Ohm)
In the following pictures nd a few examples of connections: series, parallel, series + parallel. Also the applicable
powerisreportedaccordingtotypeandimpedanceofeachspeaker.Pleasenotepolarityindicatedforeachspeaker.
Constant voltage systems use speakers equipped with transformer. Normally they can be con-
gured on 2 or more dierent maximum power levels. In this type of system only 2 conduc-
tors are employed: the black one is connected to the negative terminal (usually marked by “0” or
“COM”), the red one is connected to one of the contacts (50V, 70V, 100V). The amplier driving all
speakers will be connected to such 2 wires paying attention that right polarities are respected.
Please note that:
• Voltage selected on speaker transformer must match the voltage selected on the amplier.
• Total sum of speakers power must not exceed power of the amplier.
• To ensure a correct reproduction of the audio signal it is important to setup the connection with no phase
shifts: the connection between positive and negative poles of the amplier must match the polarity on
speaker transformer.
• It is important that cables have an adequate section: increasing total length of the sound installation in-
volves increasing of cable section to avoid distortion or signal loss.
• Cables for connection of the speakers should be passed separately from other electrical or microphone
cables, to avoid ground loops or triggers of any kind.
• It‘s always important to use cables with twisted wires

12 MZA8412
16 Ohm 120W
4 Ohm 30W
4 Ohm 30W
4 Ohm 30W 4 Ohm 30W
SERIES CONNECTION
16 Ohm 30W
16 Ohm 30W 16 Ohm 30W 16 Ohm 30W
4 Ohm 120W
PARALLEL CONNECTION
16 Ohm 30W
16 Ohm 30W
8 Ohm 60W
4 Ohm 120W
PARALLEL CONNECTION
4 Ohm 120W
8 Ohm 60W
4 Ohm 30W
4 Ohm 30W
SERIES + PARALLEL CONNECTION

Note

Note

MUSIC & LIGHTS S.r.l. - Phone [phone] - www.musiclights.it PROAUDIO è un brand di proprietà della Music & Lights S.r.l. PROAUDIO is a brand of Music & Lights S.r.l. company. ©2021 Music & Lights S.r.l.