Peecker Sound AMCL2 User manual

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User’s Manual AMCL2
SOUND REINFORCEMENT ACOUSTIC RESEARCHCONTROLLED RADIATION
1
AMCL2 USER’S MANUAL

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User’s Manual AMCL2
SOUND REINFORCEMENT ACOUSTIC RESEARCHCONTROLLED RADIATION
2
1. IMPORTANT SAFETY INSTRUCTIONS pag. 3
2. DECLARATION OF CONFORMITY pag. 3
3. WARRANTY pag. 3
4. USER LIABILITY pag. 4
4.1 Dangerous output voltage
4.2 Radio interferences
5. INTRODUCTION pag. 4
5.1 Unpacking
5.2 Installation
5.3 Front panel
5.4 Rear panel
6. CONNECTIONS pag. 6
6.1 Connection cables
6.2 Power supply
7. FEATURE DESCRIPTION pag. 6
7.1 Advantages of multi-band limiters over wideband ones
7.2 Automatic threshold corrector
7.3 Functional features
7.4 Controls and functions
8. SETUP pag. 8
8.1 XLR connections
9. SAMPLE CONFIGURATION pag. 9
10. TECHNICAL SPECIFICATIONS pag. 10
TABLE OF CONTENTS

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3. WARRANTY
Peecker Sound products are guaranteed against malfunction due to
defective materials or workmanship for a specied period of time, starting
from the date of original purchase. Should a malfunction occur during
the warranty period, the product will be repaired or replaced (at the
manufacturer’s discretion) free of charge. The shipping costs and related
risks, and any loss during shipment to authorized service centres are the
responsibility of the customer. The product will be returned to the customer
with a carriage forward shipment.
Warranty terms
The warranty covers the appliance under its initial purchase in compliance
with the laws in force. The warranty is valid for 3 years, starting from the date
of receipt of the product. Peecker Sound reserves the right, in certain cases, to
decide to replace the appliance with another identical or similar product. The
warranty is not extended following a product failure. The warranty does not
cover any incidental or consequential damages, without limitation, caused to
persons or property during any period of inefficiency of the appliance.
Exclusions and limitations
The warranty does not apply to:
• any damage to exterior nishings or surfaces, aesthetic elements, or electric/
electronic parts resulting from negligent use of the product;
• malfunction resulting from incorrect or improper use of the product or from
transport without due care;
• malfunction resulting from repairs carried out by unauthorized persons or
service centres;
• malfunction due to circumstances that cannot be ascribed to manufacturing
defects of the appliance;
• plastic or glass parts, bulbs and the like, as well as all that can be regarded
as normal wear and tear. As regards circuit components (transistors, diodes,
etc.) the general terms set by the original manufacturers apply.
The following are also not covered by the warranty:
• damage caused by accidents, product modications, negligence or
incorrect connection
• damage that occurred during transport
• damage resulting from failure to comply with the instructions contained in
the user’s manual
• claims based on misrepresentations by the seller and any product whose
serial number has been rubbed o, modied or removed.
Receiving warranty service
To receive repair or replacement of the product under warranty, the customer
must deliver the product in its original packaging carriage paid to an
authorized Peecker Sound service centre together with the relevant proof of
purchase, i.e. bill of sale, receipt or invoice.
The warranty service and list of authorized service centres is available at the
address below:
Peecker Sound - “After Sales Service”
Via Monti Urali, 29 - 42100 Reggio Emilia (Italy)
Tel: [phone] - Fax: [phone]
E-mail: [email protected]
Repair or replacement of the product and its return to the customer are the
only services provided to the customer. Peecker Sound shall not be held liable
to pay incidental or consequential damages including, without limitation,
injury to persons or property or loss of use.
Costs paid by Peecker Sound
Peecker Sound will pay for all labour and material expenses necessary for the
repairs covered by the warranty. Make sure you keep the original packaging;
otherwise, the cost of replacing will be charged to you if necessary. Produce
the original invoice to establish the date of purchase.
Do not send the product to the factory without prior authorization. Should
shipment of the product be a problem, please contact the service centre,
who will deal with it promptly. Otherwise, the customer is responsible for
shipment and handling of the product to be repaired and payment of all
shipping costs.
1. IMPORTANT SAFETY INSTRUCTIONS
This symbol indicates key operating instructions and
information requiring particular attention for correct use
of the product.
This symbol warns of dangerous voltage and the
consequent risk of electric shock. Take extra care and
proceed with caution.
1. Read carefully all the attached product documentation and keep for
further reference.
2. Heed the warnings.
3. Keep the packaging and check that all the material is in perfect condition.
4. Do not use the product in the vicinity of water or pour water or any
other liquid on the processor. Take care not to use it with wet hands or
with your feet in water.
5. Do not use near sources of heat such as radiators, stoves or other heat-
producing appliances.
6. Check that the power cable is intact and undamaged. Do not tread on
the cable and take care not to put any pressure on the plug.
7. Connect the plug to a properly earthed electric socket. Do not tamper
with the plug. Should the plug supplied not t your socket, have an
electrician replace it with the correct one.
8. Connect to the mains supply having identical voltage as that indicated
on the back of the processor.
9. Install the processor in compliance with the instructions.
10. Disconnect the appliance in case of storms or when not in use.
11. Wire exclusively as shown in the instructions.
12. Do not remove the upper or lower covers as this would expose the
user to the risk of electric shock.
13. Do not attempt to repair the appliance yourself but always seek the
assistance of qualied technicians.
14. Clean with a dry cloth only.
15. The product must be handled by qualied technicians when:
• the power cable or the plug is damaged
• the product has been exposed to rain or humidity
• liquid has got inside the unit
• an object has fallen on the unit
• the unit has fallen and is damaged
• the appliance seems to be malfunctioning or is showing a marked
change in performance
16. Careful supervision is required if the product is used in the presence of
children or by unskilled adults.
2. DECLARATION OF CONFORMITY
This device complies with the requirements of the European Electromagnetic
Compatibility Directive 89/336/EEC (and relevant 92/31/EEC amendment),as
well as the requirements of the Low Voltage Directive 72/23/EEC (and relevant
93/68/EE amendment).
Regulations applied:
EN 55 103-1 (Emissions)
EN 55 103-2 (Immunity)
EN 60065 Class I (Safety)

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Limitation of implicit warranties
All implicit warranties, including guarantee of merchantability and suitability
to specic purposes, are limited to the duration of the present warranty.
With the exception of certain types of damage, Peecker Sound liability is
limited to repairing or replacing, at its discretion, any defective products, with
no obligation of compensation for any kind of incidental or consequential
damages. In case of any controversy, the court of jurisdiction will be
exclusively the Court of Reggio Emilia (RE) – Italy.
4. USER LIABILITY
4.1 Dangerous output voltage
Do not touch exposed speaker cables while the processor is
operating.
4.2 Radio interferences
A sample of this product has been tested and approved in compliance with
the limits set out by the Electromagnetic Compatibility Directive (EMC). These
limits have been determined in order to provide reasonable protection
from dangerous interferences caused by electrical appliances. Should this
product not be installed or used in compliance with the instructions as set
out in this manual, it might interfere with other appliances such as radio
receivers, for example.
There is no guarantee, however, that interferences will not occur in a
particular installation.
Should the device interfere with two-way radios (switching
the device on and off will allow you to check whether this
is the case), you should try to eliminate the interference by
adopting one of the following measures:
A) Increase the distance between the appliance and the
receiver.
B) Connect the appliance to a socket positioned on a
circuit different from the one the receiver is connected to.
C) Re-position or move the aerial of the receiver.
Check that the unit complies with the EMC immunity limits (it must carry
the CE mark). All electrical appliances sold in the EU must be approved for
immunity to electromagnetic elds, high voltage and radio interferences.
Seek professional assistance.
5. INTRODUCTION
Congratulations on your choice of Peecker Sound Automatic Multiband
Controller & Limiter (AMCL2) and thank you for your confidence in us
and our products.
Your controller/limiter has been carefully engineered down to the smallest
detail, from component selection to final assembly.
All Peecker Sound products aim for full customer satisfaction and you
can rest assured that the product you have chosen uses cutting-edge
technology.
The AMCL2 has been designed in the Sound Corporation Design and
Research & Development (R&D) departments paying particular attention
to the choice of materials, safety devices and electronic design for the
manufacture of a safe, reliable and long-lasting product.
Since inappropriate use of the device can jeopardize its correct operating
performance, please ensure that you use it carefully and correctly.
Please read this manual carefully: all the information it contains is vitally
important for using your appliance safely.
5.1 Unpacking
Inspect the packaging and its contents immediately to check whether
there are any signs of damage. After unpacking, inspect the product
and any accessories. Should you notice any damage, inform your dealer
immediately.
Please keep all the packaging materials, which will be useful for returning
the product to Peecker Sound or sending it to one of our authorized Service
Centres if the product does not arrive in perfect condition. Use exclusively
the original packaging, as it is the best way to protect the appliance from
mishandling by the carrier.
Please take care of the environment.
Once the device has become obsolete, please dispose of
it in the appropriate recycling container.
5.2 Installation
The Peecker Sound Automatic Multiband Controller & Limiter (AMCL2) has
been designed to stand on a surface (e.g. a table) or to be installed in a
rack unit (1 RU) for standard 19”rack mounting.
282
483
44
Figure 1. AMCL2 unit dimensions
Remember to allow an extra clearing space of 10cm at the back for the
connectors.
Do not set the unit directly on top of power ampliers or power supply
units, as the heat and electromagnetic elds produced by these appliances
can interfere with correct device operation.
When moving the equipment with a trolley take extra
care not to injure yourself.
Please remember that the unit should not be installed in venues with:
• High temperatures;
• Dust or excessive humidity;
• Intense magnetic elds;
• Water in the vicinity of the unit;
• Vibrations;
• Enclosed spaces that inhibit proper ventilation.

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2
3
1
PUSH
132 1 32
2
3
1
PUSH
JUMPER CAL LINK INPUT
L LINKINPUT R OUTPUT OUTPUT LR
PROTECTION DO NOT
REMOVE SCREW
GROUNDING
FOR CONTINUED
MAINS
230V
50/60Hz
S.N.
Lmax Leq
12345678910
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on
16 1013 131212
151415 14
11 9
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0dB
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RANGE
+.6
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+1
+.4
+.2
(dBm)
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VERNICIATURA: NERO OPACO AMCL-2 _ 22-10-10
SERIGRAFIA 2 COLORI:
GRIGIO TEA HI-GLOSS
BLU PEECKER
FILE:AMCL-2_slkf.dxf
QUOTE
ANCORAGGIO
LEGENDA: MECCANICA
COMPONENTI
SERIGRAFIA 1
H=COME DA DXF
FONT:ARIAL
Lunghezza: 435.50mm
6 5 8 3 1
7 4 2
5.3 Front panel
5.4 Rear Panel
1. Power - Power switch.
2. Limiting - LED meter indicator (in dB) of the limiter intervention.
3. Release - This potentiometer adjusts the release time.
4. Process - This button enables by-pass of the device.
5. Coarse - Potentiometer that adjusts the threshold level from -20 dB to +2 dB.
6. Fine - Potentiometer that adjusts the threshold level with a more accurate range (form -1 to +1 dB).
7. Range - Button to select the most appropriate activation threshold by selecting an attenuation of 20 dB.
8. Input - Potentiometer of the input level control.
9. Jumper cal (only with OPTIONAL board) - It allows the input signal to drive the intervention of the optional board.
10. Lmax, Leq (only with OPTIONAL board) - Dipswitch selector to change Leq and Lmax parameters.
11. Ground Lift - Earth change to connect-disconnect electrical earth to/from mechanical earth.
12.Input - Female Neutrik® XLR input connectors.
13.Output - Male Neutrik® XLR output connectors.
14. Link - 6.3 mm Jack input and output connectors for input signal loop through.
15. Output - 6.3 mm Jack output connectors.
16. Mains - Power supply cable with CEE 7/7 Schuko plug
Figure 2. AMCL2 Front panel and cover
Figure 3. AMCL2 Rear panel

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7. FEATURE DESCRIPTION
The Peecker Sound Automatic Multiband Controller & Limiter (AMCL2)
is a multiband device expressly designed to control the sound
pressure level (SPL) within a space. It belongs to the category of
devices commonly called dynamic processors capable of acting on
the audio signal level or width in a variable way, depending on the
spectral distribution of the audio signal itself. Dynamic processors
are designed to optimize the signal based on the features of the
transmitting device being used or the type of appliances adopted for
the sound reproduction system.
When talking about the dynamic range of a music program, we mean
the difference, normally expressed in dB, between the maximum
(undistorted) level reached by the signal and its minimum “useful” level,
i.e. capable of being perceived by the human ear. The maximum output
signal of an appliance is normally limited by the adjustment of the
power supply side, since the excursion can never exceed the supply
voltage. Minimum output level, on the other hand, is determined by
the background noise level, since a signal whose level is below that of
background noise cannot actually be picked up. Modern professional
equipment can produce a dynamic range capable of reaching up to as
much as 120 dB.
Multi-band limiters are used to reduce the dynamics of the input
signals being received. This reduction is determined by the fact that a
highly dynamic signal is difficult for a sound reinforcement system to
handle, which is indeed the reason why existing regulations impose
limits on audio signal levels.
Typically, such devices are used for amplification systems in public
venues where sound pressure equivalent level (Leq) and maximum
level (Lmax) cannot exceed the limits required by the applicable
national rules and regulations. Using a suitably configured AMCL2 unit
allows the system to comply with such restrictions even if the source
signal has been unintentionally adjusted to exceed them.
Unlike traditional systems, the AMCL2 guarantees the highest quality
result, where the sound is free from modulations or unpleasant
“pumping” effects that may lead to volume fluctuations. Thanks to the
possibility to manage different frequency bands (Low, Mid and High),
the musical message is optimized for the entire frequency range,
producing rich and modulated bass notes and crystal clear high notes.
7.1 Advantages of multi-band limiters over wideband ones
The use of multi-band limiters has become necessary in the world
of professional audio to make up for the shortcomings of wideband
limiters, which suffer from the problem of spectral intermodulation
distortion where, in practice, the linear combination of incoming
signals causes a spectral alteration of the overall gain, thereby
producing intermodulation effects. Typical examples of this problem
include situations in which the voice signal drops as a result of a drum
roll, for example, or when an extra, unplanned speaker is introduced,
causing a reduction in the overall spectral content.
Low frequencies – which have a higher energy content – normally tend
to control the entire spectral content; when the lowest frequencies
exceed a set threshold limit, the high frequencies are attenuated and
consequently the sound output becomes dull and restrained.
Unlike wideband limiters, multiband limiters do not behave this way
but actually produce a spectral separation of the audio signal into
multiple frequency bands so that they can be processed separately.
This can lead to more serious design and implementation problems,
but these can be resolved by using an “intelligent circuit” capable of
controlling all the parameters automatically, thereby keeping to a
minimum the set of controls.
6. CONNECTIONS
Check that your mains power voltage corresponds to that
indicated on the back of the unit.
Before connecting the cable to the AC mains make sure it is
undamaged and that there are no bare cables.
Remember to turn off the limiter before connecting it to or disconnecting it
from any other units.
6.1 Connection cables
Input and output wiring diagrams are shown in Figure 4. Neutrik® XLR
connectors are used for connecting the main audio inputs and outputs,
while 6.3 mm stereo Jacks are used for auxiliary connections. To guarantee the
maximum performance, both inputs and outputs are balanced without the
use of transformers. In any case, the cross-coupled output stage allows for
both balanced and unbalanced connection without noticeable differences in
level. In the case of unbalanced connection, the unused pin (2 or 3) must be
short-circuited with pin 1 (GROUND), and in this case, the 70 Ω impedance
of the outputs allows you to drive even long capacitive lines without any
problems. Finally, the jumper on the rear panel allows you to select NORMAL
or CAL operation when tuning the system.
XLR BAL INPUT/OUTPUT
Pin 1 GND
Pin 2 HOT+
Pin 3 COLD-
JACK INPUT/OUTPUT
Pin 1 (Sleeve) GND
Pin 2 (Ring) COLD-
Pin 3 (Tip) HOT+
Pin 4 Insulating
rings
Figure 4. Cannon® XLR and Jack connectors
6.2 Power supply
The appliance is designed to operate with a 230 VAC – 50/60Hz mains power
supply.
Should the unit fail to work when switched on, check the protection fuse; if
it blows immediately, do not try to resolve the matter yourself but have the
appliance checked by a qualied service centre.

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7.2 Automatic threshold corrector
The multi-band limiter divides the audio signal into different,
individually limited frequency bands and then adds them together.
The resulting level can sometimes be different from the set threshold.
With conventional methods using wideband limiters, the problem of
intermodulation distortion mentioned earlier would arise.
When using the AMCL2, by contrast, the sum of the two bands is sent
to an automatic correction circuit. If this exceeds the benchmark value,
the circuit automatically adjusts the individual thresholds of each
band. When the value falls below the benchmark level, the individual
thresholds of each band return to their original value. This way, the
sound maintains the utmost sharpness and is free of noticeable
distortions.
Finally, the AMCL2 uses a single automatic correction circuit for both
channels, providing perfect balancing of the stereo image with equal
limitation on both channels.
7 .3 Functional features
A key feature of the Automatic Multiband Controller & Limiter (AMCL2)
is that it is a unitary gain device, i.e. an input signal variation is matched
by an identical output signal variation. To enable the device to operate
correctly, the front panel is fitted with the following four different
controls: input level, time release and two threshold controls.
In addition, the simple design of the front panel with just a few controls
makes the AMCL2 easy to install and test. It comes complete with a
lockable front cover, as prescribed by existing regulations, to prevent
possible tampering by unauthorized users.
7 .4 Controls and functions
• Release time
Release time enables the density of the music program to be altered.
It can be defined as the interval between the time when the limiter acts
to restore the signal level and the time when the signal being processed
returns below threshold. Differences in the duration of this parameter
cause changes in spectral characteristics.
An extremely short release time gives a very narrow dynamic range
that can cause distortion at low frequencies. By selecting a fairly
short release time, the output will be kept as close as possible to the
maximum level.
Conversely, as release time is increased, distortion will be reduced,
resulting in a softer, more rounded sound.
Finally, setting an extremely long time release will lower the average
output value, particularly if the music program contains considerable
and fast variations in level (transients).
Figure 5. Time Release selector
• Threshold level control
There are three controls to adjust the threshold level on the front panel of
the AMCL2. The first control (5 in Fig. 2), labelled COARSE, is an electronic
switch adjustable in 2 dB steps ranging from -20 dBm to +2 dBm. The
second control (6 in Fig. 2), labelled FINE, is much more precise and allows
for correction of the preceding setting with a range of action from -1 dBm
to +1 dBm. If the level of the music program to be controlled is too high
and the COARSE selector is insufficient, a third control labelled RANGE (7 in
Fig. 2) can be used to reduce the output level by 20 dB. Using these three
controls simultaneously allows you to adjust the total threshold level in a
44 dB interval.
Figure 6. Threshold selector
Note that the limiter can be regarded as a special compressor, representing a
compression ratio of ∞: 1.
Graph 1 Threshold effect
-15
-10
-5
0
+5
+15
+20
+10
INPUT LEVEL (dB)
)Bd(LEVELTUPTUO
-15 -10 -5 0+5 +15 +20 +10
1:1 Unity
2:1
4:1
:1
20:1
GREE N
Below Thresh old
Rotation Po int Threshol d
During device operation, the audio signal limiting level is shown by the
Limiting (point 2 on Figure 2) LED display on the front panel.
Figure 7. Limiting display

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• Process Switch
The AMCL2 features a PROCESS switch (4 on Fig. 2) which allows it to be
excluded from the reproduction chain. When in OFF position, input and
output connectors can be wired directly through high quality audio relay.
The switch is normally used to compare the unprocessed signal with the
signal resulting from using the limiter.
Figure 8. Process switch
• Automatic LMAX and LEQ Control
(with OPTIONAL DPC215 board)
Automatic control of action parameters is activated by setting the jumper
connector (point 9 in Fig. 3) to NORMAL. The input line signal will now drive
limiter action.
The default values of Lmax and Leq parameters, factory pre-set to 104.5 dB
and 95 dB respectively, can be changed using the dipswitch control panel (10
in Fig. 3) situated on the rear panel next to the JUMPER CAL connector. Use
dipswitches 1-6 to change the Lmax value (Fig. 9): setting the selector to ON
will increase Lmax value as shown in the table below.
The Leq value can be changed using dipswitches 7-10: each dipswitch set to
ON decreases LEQ value as shown in the table below.
Manuale d’uso
via Monti Urali, 33 - 42100 Reggio Emilia (Italia) • tel. [phone] • fax [phone] • e-mail: [email protected]
www.peeckersound.com
via Monti Urali, 33 - 42100 Reggio Emilia (Italia) • tel. [phone] • fax [phone] • e-mail: [email protected]
www.peeckersound.comwww.peeckersound.com
®
Operating controls
6
Figure 2: Hard Knee Compression Curve,and OverEasy® Compression Curve, and Threshold
LEDs.
Figure 3 shows the effect of 2:1 compression on a signal as it rises above and falls below the threshold.
Below the threshold the signal is not affected. Above the threshold, the output signal increases by only
half of the increase (in dB) of the input signal level. In other words, with a 2 dB increase in input level,
the output increases by only 1 dB, hence the 2:1 compression ratio.
Figure 3: Compression Effect on Signal Level with a 2:1 Ratio at a -20 dBu Threshold
Contour Switch - This switch adds a gentle low frequency de-emphasis into the detector path. This is
extremely useful in keeping low frequency program material from “muffling” or “punching holes in” the
compressed signal. This feature allows faster attack times and higher compression ratios with less arti-
facts. The switch will light indicating contouring is activated.
Compressor Ratio Control - This control selects the ratio between input and the output levels for sig-
nals above the level set by the COMPRESSION THRESHOLD control. It is adjustable between 1:1 and
infinity:1. Note, when OverEasy® processing is selected, the ratio transitions smoothly from the linear to
the compressed region. As the signal exceeds the threshold, the ratio approaches the ratio set by the
COMPRESSOR RATIO control.
Gain Reduction Meter - This 12 stage meter shows the amount of gain reduction due to compression,
expansion/gating, or Intelligent Predictive Limiting™, displaying gain reduction from 0 to 30 dB.
Attack Control - The ATTACK control sets the amount of time it takes the 1066 to begin compressing a
signal once the detector has sensed a signal above threshold. The ATTACK range is from 3 dB/msec (for
a tighter and more noticeable compression effect with very little overshoot) to .04 dB/msec (for more
delayed, gradual compression). A very fast ATTACK setting will cause the 1066 to act like a peak limiter
-40
-30
-20
-10
0
10
Time
Signal Level (dBu)
Below Threshold
Above Threshold
Input Signal
Output Signal
-40
-30
-20
-10
0
10
Time
Signal Level (dBu)
Below Threshold
Above Threshold
Input Signal
1:1
2:1
4:1
:1
<15
<10
<5
0
+5
+15
+20
+10
INPUT LEVEL (dB)
OUTPUT LEVEL (dB)
<15 <10 <5
0+5 +15 +20
+10
RED
Below Threshold
Above Threshold
OverEasy Range
GREEN
A
M
BE
R
-15
-10
-5
0
+5
+15
+20
+10
INPUT LEVEL (dB)
OUTPUT LEVEL (dB)
-15 -10 -5 0+5 +15 +20 +10
1:1 Unity
2:1
4:1
:1
20:1
RED
Above Threshold
GREEN
Below Threshold
Rotation Point Threshold
Durante il funzionamento del dispositivo, il livello di limitazione
del segnale audio Vu Meter (2 di Fig. 2) è visualizzato tramite
un’opportuno display a led posto sempre nel pannello frontale.
Graco 1: Effetto Threshold
Figura 7: Display Vu Meter
Tasto Process•
L’ AMCL2 è provvisto di pulsante PROCESS (4 di Fig.2) per
l’esclusione dell’apparecchio dalla catena di riproduzione. Il
pulsante in posizione 0FF, abilita un collegamento diretto fra i
connettori di ingresso e quelli d’uscita tramite release di alta qualità
audio. Normalmente l’interruttore è utilizzato per comparare il
segnale non elaborato rispetto al segnale risultante dopo l’impiego
del limitatore.
Figura 8: Tasto Process
Controllo automatico L• max e Leq
(con scheda DPC215 OPZIONALE)
Il controllo automatico dei parametri di intervento avviene inserendo
jumper di Fig. 10 nella posizione NORMAL. In questo modo, il
segnale di linea posto in ingresso pilota l’intervento del dispositivo.
I valori di default dei parametri Lmax e LEQ, impostati da fabbrica a
104.5 dB e 95 dB rispettivamente, possono essere variati tramite
il banco di dipswitch (10 di Fig.2), posto sul pannello posteriore
vicino al connettore JUMPER CAL. Il valore di Lmax (Fig. 9) è
modicabile agendo sui diversi dipswitch dall’1 al 6: impostando il
selettore in posizione ON si incrementa il valore di Lmax secondo la
tabella riportata. Invece, il valore di LEQ è modicabile agendo sui
dipswitch dal 7 al 10: ogni dipswitch impostato su ON decrementa
il valore di LEQ come da tabella riportata sotto.




   
  
 


 















Figura 9: Banco di dipswitch




 








 



 


 



 


 







Figura 10: Scheda DPC215 (OPZIONALE)
Dopo aver connesso l’AMCL2 alla linea di alimentazione e ai
dispositivi di ingresso e uscita, settare i controlli come segue:
Posizionare il pulsante PROCESS su ON.1.
Posizionare il pulsante RANGE in 0 dB.2.
Posizionare il commutatore COARSE al valore massimo (+2 3.
dBm).
Posizionare il tempo di rilascio su un valore opportuno tale da 4.
ottenere la funzionalità desiderata (vedi paragrafo “Tempo di
rilascio”).
Tenendo il JUMPER CAL disinserito, fare suonare l’impianto 5.
con un brano a bassa densità, in modo da produrre il più
basso valore di LEQ.
Ritoccare poi il valore di soglia THRESHOLD per ottenere il 6.
livello LEQ desiderato. Agire sull’attenuatore di ingresso no
ad ottenere sul display un’attenuazione che varia da 3dB a
6dB circa.
Impostare i livelli desiderati di L7. max e LEQ agendo sul banco
di dipswitch, nel caso in cui si vogliano valori diversi da quelli
impostati dalla fabbrica (Lmax = 104,5 dB ; LEQ = 95 dB).
8. Setup
9
Manuale d’uso
via Monti Urali, 33 - 42100 Reggio Emilia (Italia) • tel. [phone] • fax [phone] • e-mail: [email protected]
www.peeckersound.com
via Monti Urali, 33 - 42100 Reggio Emilia (Italia) • tel. [phone] • fax [phone] • e-mail: [email protected]
www.peeckersound.comwww.peeckersound.com
®
Operating controls
6
Figure 2: Hard Knee Compression Curve,and OverEasy® Compression Curve, and Threshold
LEDs.
Figure 3 shows the effect of 2:1 compression on a signal as it rises above and falls below the threshold.
Below the threshold the signal is not affected. Above the threshold, the output signal increases by only
half of the increase (in dB) of the input signal level. In other words, with a 2 dB increase in input level,
the output increases by only 1 dB, hence the 2:1 compression ratio.
Figure 3: Compression Effect on Signal Level with a 2:1 Ratio at a -20 dBu Threshold
Contour Switch - This switch adds a gentle low frequency de-emphasis into the detector path. This is
extremely useful in keeping low frequency program material from “muffling” or “punching holes in” the
compressed signal. This feature allows faster attack times and higher compression ratios with less arti-
facts. The switch will light indicating contouring is activated.
Compressor Ratio Control - This control selects the ratio between input and the output levels for sig-
nals above the level set by the COMPRESSION THRESHOLD control. It is adjustable between 1:1 and
infinity:1. Note, when OverEasy® processing is selected, the ratio transitions smoothly from the linear to
the compressed region. As the signal exceeds the threshold, the ratio approaches the ratio set by the
COMPRESSOR RATIO control.
Gain Reduction Meter - This 12 stage meter shows the amount of gain reduction due to compression,
expansion/gating, or Intelligent Predictive Limiting™, displaying gain reduction from 0 to 30 dB.
Attack Control - The ATTACK control sets the amount of time it takes the 1066 to begin compressing a
signal once the detector has sensed a signal above threshold. The ATTACK range is from 3 dB/msec (for
a tighter and more noticeable compression effect with very little overshoot) to .04 dB/msec (for more
delayed, gradual compression). A very fast ATTACK setting will cause the 1066 to act like a peak limiter
-40
-30
-20
-10
0
10
Time
Signal Level (dBu)
Below Threshold
Above Threshold
Input Signal
Output Signal
-40
-30
-20
-10
0
10
Time
Signal Level (dBu)
Below Threshold
Above Threshold
Input Signal
1:1
2:1
4:1
:1
<15
<10
<5
0
+5
+15
+20
+10
INPUT LEVEL (dB)
OUTPUT LEVEL (dB)
<15 <10 <5
0+5 +15 +20
+10
RED
Below Threshold
Above Threshold
OverEasy Range
GREEN
A
M
BE
R
-15
-10
-5
0
+5
+15
+20
+10
INPUT LEVEL (dB)
OUTPUT LEVEL (dB)
-15 -10 -5 0+5 +15 +20 +10
1:1 Unity
2:1
4:1
:1
20:1
RED
Above Threshold
GREEN
Below Threshold
Rotation Point Threshold
Durante il funzionamento del dispositivo, il livello di limitazione
del segnale audio Vu Meter (2 di Fig. 2) è visualizzato tramite
un’opportuno display a led posto sempre nel pannello frontale.
Graco 1: Effetto Threshold
Figura 7: Display Vu Meter
Tasto Process•
L’ AMCL2 è provvisto di pulsante PROCESS (4 di Fig.2) per
l’esclusione dell’apparecchio dalla catena di riproduzione. Il
pulsante in posizione 0FF, abilita un collegamento diretto fra i
connettori di ingresso e quelli d’uscita tramite release di alta qualità
audio. Normalmente l’interruttore è utilizzato per comparare il
segnale non elaborato rispetto al segnale risultante dopo l’impiego
del limitatore.
Figura 8: Tasto Process
Controllo automatico L• max e Leq
(con scheda DPC215 OPZIONALE)
Il controllo automatico dei parametri di intervento avviene inserendo
jumper di Fig. 10 nella posizione NORMAL. In questo modo, il
segnale di linea posto in ingresso pilota l’intervento del dispositivo.
I valori di default dei parametri Lmax e LEQ, impostati da fabbrica a
104.5 dB e 95 dB rispettivamente, possono essere variati tramite
il banco di dipswitch (10 di Fig.2), posto sul pannello posteriore
vicino al connettore JUMPER CAL. Il valore di Lmax (Fig. 9) è
modicabile agendo sui diversi dipswitch dall’1 al 6: impostando il
selettore in posizione ON si incrementa il valore di Lmax secondo la
tabella riportata. Invece, il valore di LEQ è modicabile agendo sui
dipswitch dal 7 al 10: ogni dipswitch impostato su ON decrementa
il valore di LEQ come da tabella riportata sotto.




   
  
 


 















Figura 9: Banco di dipswitch




 








 



 


 







 







Figura 10: Scheda DPC215 (OPZIONALE)
Dopo aver connesso l’AMCL2 alla linea di alimentazione e ai
dispositivi di ingresso e uscita, settare i controlli come segue:
Posizionare il pulsante PROCESS su ON.1.
Posizionare il pulsante RANGE in 0 dB.2.
Posizionare il commutatore COARSE al valore massimo (+2 3.
dBm).
Posizionare il tempo di rilascio su un valore opportuno tale da 4.
ottenere la funzionalità desiderata (vedi paragrafo “Tempo di
rilascio”).
Tenendo il JUMPER CAL disinserito, fare suonare l’impianto 5.
con un brano a bassa densità, in modo da produrre il più
basso valore di LEQ.
Ritoccare poi il valore di soglia THRESHOLD per ottenere il 6.
livello LEQ desiderato. Agire sull’attenuatore di ingresso no
ad ottenere sul display un’attenuazione che varia da 3dB a
6dB circa.
Impostare i livelli desiderati di L7. max e LEQ agendo sul banco
di dipswitch, nel caso in cui si vogliano valori diversi da quelli
impostati dalla fabbrica (Lmax = 104,5 dB ; LEQ = 95 dB).
8. Setup
9
Figure 9. Dipswitch control panel
Figure 10. DPC215 board (OPTIONAL)
8. SETUP
Once you have connected the AMCL2 to the power mains and the input
and output connectors, set the controls as follows:
1. Position the PROCESS button to ON.
2. Position the RANGE button to 0dB.
3. Position the COARSE switch to maximum value (+2dBm).
4. Position the release time to a value suitable for the function you require
(see paragraph on“Release time”).
5. With the JUMPER CAL off, play a piece of low density music to produce
the lowest possible LEQ value.
6. Adjust the THRESHOLD value to obtain the required LEQ value. Adjust
the input attenuator until the display shows attenuation varying
roughly from 3dB to 6dB.
7. Should you wish to change the factory pre-set LMAX and LEQ values
(LMAX = 104.5dB; LEQ = 95dB) use the dipswitch panel to set your
required values.
8. Set JUMPER CAL to NORMAL.
9. Play a piece of high density music (to produce the highest possible
LEQ value).
10.Perform a monitoring exercise lasting no less than 30 minutes playing
different types of music genres. Record the resulting LMAX and LEQ
data.
11.If the recorded values exceed allowed levels, use the various
THRESHOLD, LMAX and LEQ controls to get as close as possible to the
required limits.
Note: points 5. 7. and 8. are only applicable if the OPTIONAL DPC215 board is
installed.
8.1 XLR connections
The following diagrams show the possible balanced and unbalanced
connections with Cannon XLR connectors.
Figure 11. XLR connections

-22
-12
-30
-18
OFF
ON
PROCESS
-15
AMCL-2
Controller & Limiter
Automatic Multiband
-15
.15
-4 .25
dB
INPUT
0
-2 .2
-8
-10
-6 .4
4
6.5
sec
RELEASE
7
2.5
11.3 1.5
-3
LIMITING (dB)
-9
-12 -6 0
POWER
User’s Manual AMCL2
SOUND REINFORCEMENT ACOUSTIC RESEARCHCONTROLLED RADIATION
9
via Monti Urali, 33 - 42100 Reggio Emilia (Italia) • tel. [phone] • fax [phone] • e-mail: [email protected]
www.peeckersound.com
via Monti Urali, 33 - 42100 Reggio Emilia (Italia) • tel. [phone] • fax [phone] • e-mail: [email protected]
www.peeckersound.comwww.peeckersound.com
Manuale d’uso
Il limitatore multi-banda AMCL2 di Peecker Sound trova una
possibile applicazione a valle di un pre-amplicatore d’ingresso e
a monte di un amplicatore (come ad esempio i nuovi PS 2000-
PS2600-PS3400 Peecker Sound).
Figura 12: Esempio di congurazione





























 





 



 

  






 


 








   



   












































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


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






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





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


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

R L
LR
A AC C
CCB B
9. Esempio di configurazione
11
Figure 12. Sample configuration with AMCL2 between a pre-amplifier and PS1000 power amplifier
9. SAMPLE CONFIGURATION
A possible Peecker Sound AMCL2 application is downstream
from a pre-amplifier input and upstream from an amplifier (such as the Peecker Sound PSDSP amps, mod. PS2000-PS2600-
PS3400, for example).

-22
-12
-30
-22
-12
-30
-18
OFF
ON
PROCESS
-15
AMCL-2
Controller & Limiter
Automatic Multiband
-15
.15
-4 .25
dB
INPUT
0
-2 .2
-8
-10
-6 .4
4
6.5
sec
RELEASE
7
2.5
11.3 1.5
-3
LIMITING (dB)
-9
-12 -6 0
POWER
User’s Manual AMCL2
SOUND REINFORCEMENT ACOUSTIC RESEARCHCONTROLLED RADIATION
10
Input Channels 2
Input Impedance 20 kΩ, electronically balanced
10 kΩ, electronically unbalanced
Max Input Level +24 dBu
Nominal Input Level 0 dBu
Output Channels 2
Output Impedance 140 Ω, electronically balanced
70 Ω, electronically unbalanced
Max Output Level +22 dBu
Nominal Output Level 0 dBu
Acoustic specifications
Frequency Response 16 Hz ÷ 100 kHz (+0/-3 dB)
THD 0.005% typ (20 Hz ÷ 20 kHz)
IMD -SMTPE 0.006%
SNR > 90 dB with range 0 dB typ (20 Hz ÷ 20 kHz)
> 106 dB with range -20 dB typ (20 Hz ÷ 20 kHz)
Crosstalk - 86 dB (@ 10 kHz)
CMRR > 66 dB
Processing
Gain 0 dB
Time Release from 150 ms to 7 s
Threshold Range from -41 dBm to +3 dBm
Automatic Control Lmax: 90 ÷ 121.5 dBA
Leq: 82,5 ÷ 119.5 dBA
Connectors
Audio Inputs 3 pin female XLR, JACK
Audio Outputs 3 pin male XLR, JACK
Mains CEE 7/7 Schuko
Power
Operating Voltage 230 VAC ± 10% (50/60 Hz)
Consumption < 25 Watt
Dimensions and Weight
Width 483 mm (19”)
Height 44 mm (1 rack unit)
Depth 285 mm
Net Weight 4.5 kg
10. TECHNICAL SPECIFICATIONS