PROEL AMP 120Z4 Instruction manual

PROEL AMP 120Z4 Instruction manual
PA Zone Mixer/Amplifier
AMP 120Z4 / 180Z4 / 240Z4
To reduce the risk of electric shock do not remove cover (or back panel). No
user serviceable parts inside. Refer servicing to qualified personnel only.
To reduce the risk of fire or electric shock, do not expose this apparatus to
rain or moisture.
This symbol is intended to alert the user of the presence of uninsulated
dangerous voltage within the product enclosure that may be of sufficient
magnitude to constitute a risk of electric shock to persons.
This symbol is intended to alert the user of the presence of important operating
and maintenance (servicing) instruction in the literature accompanying the
appliance. Please carefully read the owner’s manual.
All safety and operating instructions should be read before the product is operated.
Retain these instructions:
All safety and operating instructions should be retained for future reference.
This owner’s manual should be considered as a part of the product and it must accompany it
every time, and delivered to the new user when this product is sold. In this way the new owner will
be aware of all the installations, operating and safety instructions.
Heed all warnings:
All warnings on the product and in owner’s manual should be adhered to.
Heed all warnings.
Follow all instructions:
All operating and user’s instructions must be followed.
Sentences preceded by
symbol contain important safety instruction. Please read it carefully.
Water and moisture:
This apparatus should not be used near water (i.e. bathtub, kitchen sink, swimming pools,
This apparatus should be placed in a position that doesn’t interfere with correct ventilation.
This unit, for example, should not be placed on a bed, sofa cover o similar surfaces that could
cover ventilation openings, or placed in a built-in installation, such a bookcase or a cabinet
that could block air flow trough ventilation openings.
This apparatus should be placed away from heat sources, like radiators, heat registers, stoves
or other products (including amplifiers) that produce heat.
Power sources:
This apparatus should be connected only to power source type specified in this owner’s
manual or on the unit.
If the supplied AC power cable plug is different from wall socket, please contact an
electrician to change the AC power plug.
Grounding or Polarization:
All precautions must be observed in order to avoid grounding or polarization defeating.
Unit metal parts are grounded through the AC power cord.
If the AC power outlet doesn’t have grounding, consult an electrician for outlet grounding.
Power cord protection:
The power cord should be routed in a way it will not be walked on or pinched by items placed
upon or against it, paying particular attention to cords at plugs, convenience receptacles and
wall outlet.
You can clean the unit with a compressed air flow or a wet cloth.
Don’t clean the unit using solvents like trichloroethylene, thinners, alcohol, or other fluids
with very strong volatility and flammability.
Non use periods:
The unit AC power cord should be unplugged from the outlet if it’s unused for a long period.
Objects or liquid entry inside the unit:
Be careful that no objects fall or liquid is spilled inside the unit through ventilation openings.
Safe power line use:
Keep firmly the plug and the wall outlet while disconnecting the unit from AC power.
If the unit will not be used for a long period of time, please unplug the power cord from AC
power outlet.
To avoid unit power cord damaging, please don’t strain the AC power cable and don’t
bundle it.
In order to avoid unit power cord damaging, please be sure that the power cord is not
walked on or pinched by heavy objects.
Unit relocation:
Before any unit relocation please control the unit is turned off. The power cord must be
unplugged by wall outlet, as well as all the connections wires should be disconnected.
Don’t open this unit:
Don’t attempt to open or repair this unit by yourself. For any problem solution not described in
this owner’s manual, please refer to qualified personnel only or consult us or your National
Distributor. Any improper operation could result in fire or electric shock.
Damages requiring services:
Don’t attempt to do operations not described in this user’s manual.
In the following cases please refer to an authorized maintenance center or skilled
- When the unit works improperly or it doesn’t work at all.
- If power cord or plug are damaged.
- If liquid has spilled, or objects have fallen into the unit.
- The unit has been exposed to rain.
- The unit doesn’t operate normally o it exhibits a marked change in performance.
- If the product has dropped or it has been damaged in any way.
The user shouldn’t attempt maintenance operation not described in this user’s manual. Every
maintenance operation should be done by qualified personnel only.
Install this unit following owner’s manual instructions.
Don’t install, connect or disconnect power supply when the unit is powered, otherwise
there’s an high risk of electric shock.
Don’t open the unit, there are no user serviceable parts inside.
If you detect a particular smell from the unit, please immediately turn it off and disconnect
the AC power cord.
Don’t block the unit ventilation openings.
Avoid using this unit in overload for a long period.
Don’t force commands (switches, controls, etc.)
To obtain good speakers wire contacts, please tighten the screw terminals firmly.
For safety reason, don’t defeat the grounding connection. Grounding is useful for user
Use only connectors and accessories suggested by the manufacturer. .
This unit should be placed in a rack (see INSTALLATION) and kept far from:
Wet places
Direct exposure to heat sources (like sun light)
Non properly ventilated places
Disconnect the power cord during storms or when the unit is not used.
In order to prevent fire and electric shock risks, it’s necessary to keep the unit far
from sprinkling and drops. Please don’t put cups, vases or other object containing liquids
over the unit. In case of interferences from source signal, THD value will raise over 10%.
Don’t place this unit in a bookshelf o in other places with small room.
PROEL S.P.A. is not responsible for any damage that occurs due to a wrong unit
Thank you for choosing one of Proel products, and for your confidence towards
our brand, synonymous of professionalism, accuracy, high quality and reliability.
All our products are CE approved and designed for continuous use in
professional installation systems.
2. Description
These units have been specifically designed for paging, music, and sound
reinforcement applications in P.A. systems.
• Impedance constant outputs (4, 8, 16 Ω) and constant voltage outputs
(25, 70, 100 V).
• Four combo (XLR – ¼” jack) inputs
• PRE-OUT output
• MAIN-IN input
• RCA input
• LED level meter
• Five zone selection switches
• Monitor output
• Vocal activating priority input
• Contact activating priority input
• Signal peak LED
• Signal present LED
Protection circuit LED
Telephone-line signal input
Bass and Treble EQ controls
Output volume control
Five independent level controls for input signals
fig. 1
1) POWER - Power switch.
2) P.I. - Power LED. This LED is lit when the power switch is on.
3) LED volume meter.
4) Zone selection switches.
5) PEAK - Signal peak LED
6) SIGNAL - Signal present LED
7) PROT - Protection circuit status LED
8) ZONE SELECT - Active zone LED indicator
9) TREBLE - High frequencies control
10) BASS - Low frequencies control
11) Input signal level controls
12) MASTER – Master level control
13) CHIME – Chime activating switch
fig. 2
IEC AC power socket.
Telephone - paging input.
Priority function activation terminals.
Monitor output terminals.
Zone 1, 2, 3 and 4 (100V outputs ) output terminals.
Speakers outputs for constant impedance/constant voltage connection.
INPUT 1-2-3-4 sensitivity selectors.
INPUT 1-2-3-4 connectors.
AUX IN sensitivity selector.
AUX IN inputs.
MAIN IN input.
PRE-OUT output.
Monitor volume trimmer control.
Telephone - paging volume trimmer.
Vite GND
Selettore della tensione d’alimentazione
5. Installation
1. Input connections yellow green red
• INPUT1, INPUT2, INPUT3, and INPUT4 are balanced/unbalanced,
useful for low impedance (30-600Ω) dynamic microphones, or 24V
phantom condenser microphones, or audio sources with line level
output (i.e. AM/FM tuner, cassette deck, CD player, etc.). The
connectors are 3-pin “XLR”.
To choose the source type to be connected, please use selectors
(fig. 2 ref. 7): LINE position for AM/FM tuners, CD players etc.,
MIC position for dynamic microphones and PHANTOM position
for condenser microphones. INPUT1 is provided of VOX function.
When this input receives a signal, this signal has priority over all the
other inputs; in this way only INPUT 1 audio signal is amplified.
- Never connect unbalanced microphones when PHANTOM power is active, this
power could be damaged.
- Turn off PHANTOM power before connecting or disconnecting the microphones
- Be sure that PHANTOM power is not active when you use microphones that don’t
need external power. Phantom power applied to XLR pin 2 and 3 could damage the
R (right) and L (left) sockets allow to input right and left channels using
RCA connectors. It’s possible to use this input for an external audio
source (fig. 2 ref.10).
MAIN IN input is connected to PRE OUT output by a jumper. It’s
possible to obtain a better performance of amplified sound inserting
an external unit (i.e. equalizer, processor etc.). Please see the
following picture for proper wiring.
• IEC AC power connection.
To connect this unit to AC power outlet, please use the supplied AC
linecord. (fig. 2 ref. 1).
Before connecting the unit to AC power, please control that the
power selector (fig.2 rif.17) matches your local AC power value.
• TEL.PAGING input
This input allows you to connect a telephone signal (600Ω) with
priority over all the other signals (fig. 2 ref. 2).
Signal volume may be set using the TEL.VOL. trimmer located on
unit rear panel (fig. 2 ref. 14).
2. Output connections
To prevent the risk of electric shock, never touch amplifier outputs
when the amplifier is turned on.
• Speakers connections.
To access to speaker connection terminals remove the protection
cover unscrewing the correspondent screws (fig.2 ref. 5, ref. 6).
This amplifier may be used both with constant impedance speakers
(4, 8, and 16 Ω) and with constant voltage speakers (25V, 70, and
100V). Make proper connections applying following instructions.
Constant impedance line
To use this amplifier with a constant impedance line (4Ω, 8 Ω, and
16 Ω), please connect the COM terminal to the negative post of your
speaker and connect the proper impedance terminal to the positive
− To obtain the best performances, total speakers impedance
connected to the line, should be equal to the amplifier output
− The speakers power sum should not be lower than amplifier output
− We suggest you don’t use long cables. Anyhow, for longer
distances application use a thicker cable.
Constant voltage line
If you’re using a constant voltage line, connect either the 70, or 100V to
the “+” side of speaker system, and connect COM to “-“ side of the
speaker (fig.2 rif.6).
− For discrete line installation (zone system), each zone is
independent from the other, connect speakers terminals to COM
and to the desired zone number (fig. 2 ref. 5).
− If you’re using a zone selector, you won’t be able to use constant
impedance speakers, since the line is set at 100 V constant
− Speakers should have a transformer of the same voltage
developed by the amplifier.
− The speakers power sum should not exceed the amplifier
maximum output power.
• MONITOR output connection
This output allows you to connect a speaker (monitor), driven from
the unit internal 1W amplifier, reproducing AUX IN signals.
− Connection is obtained using rear panel terminals (fig. 2 ref. 4).
− Output signal is set by AUX IN volume control, or by rear panel
Monitor vol. trimmer (fig. 2 ref. 13).
3. GND terminal (unit grounding).
This terminal allows hardware unit grounding if power socket is not
“grounding” provided (fig. 2 ref. 16).
Grounding connection should be done by qualified personnel only.
4. COM terminal
Common output terminal, see step 2 (constant voltage output line
5. PRIORITY function
When PRIORITY and COM terminal (fig. 2 ref. 3) are in short-circuit,
AUX INPUT is automatically lowered, leaving priority to INPUT2
INPUT3 and INPUT4 signals.
6. VOX function sensitivity
It’s possible to modify the signal level that sets the activation of VOX
function using the “F” trimmer at the bottom of the unit.
Using a screwdriver, please rotate clockwise the trimmer to boost
activating sensitivity, or counter clockwise to cut activating sensitivity.
7. CHIME switch
The unit has a chime built in generator, that can be activated by the front
panel switch (fig. 1 ref. 13), to be used for paging beginning or end.
When chime is activated it has priority over all the other signals and its
volume is set by INPUT1 and MASTER controls.
6. Operations
a. To turn the unit on press the POWER switch.
b. To turn the unit off press the POWER switch again.
c. BASS control modifies the signal lower frequencies output. Set this
control level by personal taste and ambient acoustic character.
d. TREBLE control modifies the signal higher frequencies output. Set
this control level by personal taste and ambient acoustic character.
e. INPUT 1-2-3-4 and AUX IN (INPUT 5) inputs have independent
volume controls. Set these control level by personal taste to decide
for each audio source its own intensity.
f. Turning clockwise the MASTER volume control, the playback level
will raise, turning it counter clockwise it will be lower. To get the best
output level the master volume should be set between an output
level between –20 dB and 0 dB, as shown by 5 lower LEDs (fig. 1
ref. 3). Make sure the two higher LEDs (+3dB and +6dB) are not lit.
These LEDs will indicate that signal is distorted and that MASTER
volume should be decreased.
g. To select the area (ZONE) where sound diffusion is desired, it’s
necessary to press the key close to the chosen section. If you want
to activate simultaneously all the areas, you’ll just have to push the
ALL key.
7. Technical specifications
RMS / MAX (W) output
Constant impedance
Constant voltage
Inputs connectors
Outputs connectors
Frequency response
Harmonic distortion
Signal to noise ratio
AC power
Rack unities
Dimensions (W x H x D)
120 W / 150 W
180 W / 240 W
240 W / 300 W
4Ω, 8 Ω, 16Ω
25V, 70V, 100V
4 COMBO XLR / 6.3 mm jack input
AUX IN RCA input
4Ω, 8Ω, 16Ω on terminal board
25V, 70V, 100V on terminal board
30-20000 Hz (± 3dB)
≤ 0,5% (1KHz)
Input 1-4 ≥60dB; Aux in ≥70dB; Main in ≥80dB
BASS ± 10dB-100 Hz / TREBLE ±10dB-10KHz
7 independent volume controls for: Input 1-2-3-4,
Aux in, Monitor,Tel.Paging; 1 Master output control;
Zone 1-2-3-4-All level controls
115/230 V AC (± 5%) - 60/50 Hz
2U standard 19”
435 mm x 100 mm x 335 mm – 17.1 x 4 x 13.2 in.
9.3 kg. - 20.4
10.3 kg. –
12 kg. – 26.5 lbs
22.6 lbs
8. Typical hookup diagram
The product is in compliance with Directive 89/336/EEC (Electromagnetic Compatibility)
and following modifications 92/31/EEC and 93/68/EEC, as the following standards:
EN 50082-1:1997, EN 55013:1990, EN 55020:1994
it is also in compliance with Directive 73/23/EEC (Low Voltage)
and following modifications 93/68/EEC, as the following standard:
EN 60065:1998
Proel SpA pursue a policy of continuous research and development. Proel SpA reserve the right to modify
product circuitry and appearance at any moment, without prior notice.
(World Headquarters - Factory)
Via alla Ruenia 37/43
64027 Sant’Omero (Te) – Italy
Tel: +39 0861 81241
Fax: +39 0861 887862
E-mail: [email protected]
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