Full Text Searchable PDF User Manual
CV Series Digital Amplifiers
Quick Start Guide
CV Series Digital Amplifiers v1.0
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WARNING:
To reduce the risk of fire or electric shock, do not expose this appliance to rain or moisture.
CAUTION:
WARNING: SHOCK HAZARD – DO NOT OPEN
AVIS: RISQUE DE CHOC ÉLECTRIQUE – NE PAS OUVRIR
The lightning flash with the arrowhead symbol within an equilateral
triangle, is intended to alert you to the presence of uninsulated
dangerous voltages within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to
alert the user to the presence of important operating and maintenance
(servicing) instructions in the literature accompanying the appliance.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these Instructions.
2. Keep these Instructions.
3. Heed all Warnings.
4. Follow all Instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturers’ instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus (including amplifiers) that
produce heat.
9. Do not defeat the safety purpose of the polarized or grounding - type plug. A polarized plug has two blades with one wider
than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are
provided for your safety. When the provided plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12.
Use only with the cart, stand, tripod, bracket or table specified by the manufacturer or sold with the apparatus,
when a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
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13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
Do not expose the apparatus to dripping or splashing, and ensure that no objects filled with water, such as vases,
are placed on the apparatus.
L’appareil ne doit être exposé aux écoulements ou aux éclaboussures et aucun objet ne contenant de liquide, tel
qu’un vase, ne doit être placé sur l’appareil.
The mains plug is used as the disconnect device and it should remain readily accessible during intended use. In
order to isolate the apparatus from the mains, the mains plug should be completely removed form the mains
outlet socket.
Le prise du secteur ne doit pas être obstruée ou doit être facilement accessible pendant son utilisation. Pour être
complètement déconnnecté de l’alimentation d’entrée, la prise doit être débranchée du secteur.
SAFETY INFORMATION
Safety notes regarding installation
•
Do not expose the unit to water or moisture.
•
Do not expose the unit to naked flames.
•
Do not block or restrict any air vent.
•
Do not operate the unit in ambient temperatures above 35 °C.
•
Do not touch any part or terminal carrying the hazardous live symbol while power is supplied to the unit.
•
Do not perform any internal adjustments unless you are qualified to do so and fully understand the hazards associated
with mains operated equipment.
•
The unit has no user serviceable parts. Refer any servicing to qualified service personnel.
•
If the moulded plug is cut off the AC power lead for any reason, the discarded plug is a potential hazard and should be
disposed of in a responsible manner.
Conformities
This product conforms to the following European EMC Standards:
BS EN 55032:2012
BS EN 55024:2010
This product has been tested for use in commercial and light industrial environments. If the equipment is used in controlled
EMC environments, the urban outdoors, heavy industrial environments or close to railways, transmitters, overhead power lines
etc. the performance of the unit may be degraded.
This product conforms to the following electrical safety standard:
BS EN 62368-1:2014
This product is designed to be compliant with the relevant provisions of Energy Star® Eligibility Criteria Ver 3.0 for Audio-
Video products
.
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RoHS and WEEE declaration
Cloud Electronics Limited manages its business and collaborates with its suppliers to comply with the European Union restriction
of the use of certain hazardous substances in electrical and electronic equipment, RoHS Directive (2002/95/EC), that came into
force on 1st July 2006, and similar restrictions in other jurisdictions.
The “crossed out wheelie bin” symbol on the product and represented above is there to remind users of the obligation
of selective collection of waste. This label is applied to various products to indicate that the product is not to be
thrown away as unsorted municipal waste. At the end of life, dispose of this product by returning it to the point of
sale or to your local municipal collection point for recycling of electric and electronic devices.
Customer participation is important to minimize the potential effects on the environment and human health that can result
from hazardous substances that may be contained in this product.
Please dispose of this product and its packaging in accordance with local and national disposal regulations, including those
governing the recovery and recycling of waste electrical and electronic equipment. Contact your local waste administration,
waste collection company or dealer.
Safety Considerations and Information
All models in the Cloud CV Digital range must be earthed. Ensure that the mains power supply provides an effective earth
connection using a three-wire termination.
Caution – High Voltage
Do not touch any part or terminal carrying the hazardous live symbol while power is applied to the unit. Terminals to which the
hazardous live symbol refers require installation by a qualified person.
Caution – Mains Fuse
The CV Digital amplifier contains no internal fuses. Mains over-current protection is provided by the fuse on the rear panel
below the IEC connector; only replace this fuse with one of an identical type and rating.
Caution – Servicing
The unit contains no user-serviceable parts. Refer servicing to qualified personnel. Do not perform servicing unless you are
qualified to do so. Disconnect the power cable from the unit before removing the top panel and do not make any internal
adjustments with the unit switched on. Only reassemble the unit using bolts/screws identical to the original parts.
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Introduction
This Quick Start Guide is intended to help you get a CV Digital amplifier installed and working as quickly as possible. The Guide
will show you how to connect your sources and speakers to the amplifier, how to connect Cloud remote control plates and
how to perform basic amplifier configuration. It also explains the amplifier’s Power Sharing principle and covers the use of the
Remote Power Down function, which allows the amplifier to comply with some regional emergency regulations.
IMPORTANT
The Quick Start Guide is not intended as a replacement for the full Installation and User Guide.
CV Series Digital Amplifiers have a wide range of advanced features and functions, many of which are accessible from the
internal web server using a suitably-connected computer, tablet or smartphone. It is recognised that the additional flexibility
afforded by these functions will not be needed for a great many installations, and in these cases, “out-of-the-box” operation can
be achieved using the Quick Start Guide, without recourse to the web pages or knowledge of the amplifier’s more sophisticated
features.
Specifically, this Quick Start Guide does not cover configuration of the amplifier’s internal DSP section (EQ, delay, limiting,
crossovers, etc.), advanced routing options, external control via RS-232 or use of the GPIO ports. If your installation needs to
use any of these functions, or if you are in any doubt about any of the points covered in the Quick Start Guide, please consult
the full Installation and User Guide, which is available as a free download from
www.cloud.co.uk/resources/.
It should be noted that some of the operating instructions in this Guide may become inapplicable if external web browser
control is used, as external control is able to take priority over certain rear panel physical controls.
Unpacking the amplifier
The amplifier itself should be packed with the following items, in addition to this Quick Start Guide:
•
IEC power cable
•
A set of mating screw-terminal connectors for all rear panel connections.
CV Digital amplifier – models
There are four models in the range, which differ only in the number of channels available and the maximum power available
from each channel. All models have a total output rating of 1 kW, and are designed to drive 70/100 V line loudspeaker systems
directly. The models, with their nominal power ratings (see “Power Sharing” below), are:
•
CV2500 – 2 channels, 500 W/ch
•
CV4250 – 4 channels, 250 W/ch
•
CV6160 – 6 channels, 160 W/ch
•
CV8125 – 8 channels, 125 W/ch
The models are mechanically identical, and differ only in the number of LEDs on the front panel and the number of connectors
on the rear panel, which reflects the number of channels.
Power sharing
A fundamental principle of the amplifier’s design is the use of two separate internal power supplies, each rated at 500 W. The
two supplies serve the odd- and even-numbered channels respectively. Each amplifier channel is actually capable of delivering
500 W, but this figure can only be realised if the other channels in its odd/even group are unused. As other channels in the
same group are required to deliver power, the maximum power available from any one channel is reduced. The nominal ratings
quoted above are the maximum power ratings per channel when all channels are simultaneously driven equally.
This principle allows installers to use some channels to drive speakers in areas where only low power is needed, and others for
areas where more is needed.
It should be apparent that the 2 channel CV2500 is largely independent of the power sharing principle, having only one odd
and one even channel.
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Power requirements and turning the amplifier on and off
Connect the CV Digital amplifier to AC mains using the supplied IEC cable. The amplifier will operate on supply voltages from
85 to 265 V, 50 or 60 Hz.
The power button
is a “soft” type; press once to turn the amplifier on. All front panel LEDs will illuminate for a few seconds
while internal diagnostics are conducted. The green LED adjacent to the power button will remain on after this sequence.
The amplifier is highly energy efficient and has an Automatic Power Down (APD) feature, which puts individual channels
into Standby Mode after 30 minutes if no input signal to the channel has been detected. If no input signals are present when
the amplifier is turned on, all channels will go immediately into Standby Mode. The power consumption in Standby Mode is
approximately 2.5 W.
Press the power button again to turn the amplifier off.
If the mains supply is interrupted while the amplifier is on, the amplifier will execute the boot/diagnostic sequence automatically
when power is restored.
Remote Power Down
The amplifier may be “forced” into Standby Mode applying a short-circuit to the rear panel REMOTE PWR DOWN connector.
The connector is a 2-pin, 5 mm-pitch screw-terminal type. The amplifier will “wake up” when the short-circuit is removed:
wake-up time is typically 200 ms. This function can be useful in shutting down e.g., visitor attractions at museums and theme
parks.
Front panel LEDs
Each amplifier channel has four LEDs on the front panel, which function as follows:
•
POWERED
(green) – illuminates when the channel is active, i.e., it has been “woken up” when the input signal level
exceeds -77 dBu (typical threshold: may vary with programme type).
•
SIGNAL
(green) – illuminates when the output signal level from the amplifier channel is at least 30 dB below the rated
output level.
•
PEAK
(yellow) – with the channel’s limiter enabled (the factory default setting), the LED illuminates when the limiter is
active, i.e., reducing gain. Note that the limiter settings are accessed via the browser control pages. When the limiter is
disabled, the LED illuminates to indicate that the amplifier is clipping: this will normally indicate that the signal level is
too high.
•
PROTECT
(red) – illuminates when the power amplifier stage is shut down by the internal protection circuitry. This
will occur if excessive current or DC is detected at the output terminals, or if the internal temperature becomes too
high. Over-current or DC fault conditions can be cleared by removing the AC power supply for a few seconds, but when
the cause is over-temperature, the amplifier will remain in its protected state until the temperature drops (which will
generally occur if the input signal is reduced).
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Connections and adjustments
INPUT CONNECTORS
REMOTE POWER DOWN
CONNECTOR
REMOTE LEVEL CONTROL CONNECTORS
OUTPUT
CONNECTORS
70/100 V
SWITCHES
AMPLIFIER PRESETS
INPUT ROUTING
SWITCHES
HIGH PASS FILTER
SWITCHES
Inputs
The amplifier inputs are balanced. Each channel uses a separate 3-pin, 3.5 mm-pitch screw-terminal connector. Connect as
shown below:
1
3
2
INPUT: BALANCED
CONNECTION
scn
scn
cold (-)
hot (+)
1
3
2
INPUT: UNBALANCED
CONNECTION
-
+
OUTPUTS
to additional
loudspeakers
+ -
+ -
+ -
hot (+)
Outputs
The amplifier outputs can drive 100 V line or 70 V line loudspeaker systems directly. Check the 70V / 100V DIP switches to
ensure that they are in the correct position for the system voltage: there is one switch for each channel. (Note that on the
CV6160, switches 7 and 8 are not used.)
1
8
2
3
4
5
6
7
CH
100 V line
70 V line
70V / 100V
(CV8125 shown as an example)
CV8125 8-Channel Digital Amplifier (shown as an example).
Other CV models with fewer channels provide the same
functionailty as the CV8125.
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Each channel uses a separate 2-pin, 5 mm-pitch screw-terminal connector. Observe loudspeaker polarity: always connect all
‘+’ terminals together, and all ‘-‘ terminals together.
1
3
2
INPUT: BALANCED
CONNECTION
scn
scn
cold (-)
hot (+)
1
3
2
INPUT: UNBALANCED
CONNECTION
-
+
OUTPUTS
to additional
loudspeakers
+ -
+ -
+ -
hot (+)
100/70 V line loudspeakers will generally include a tapped transformer with selectable power settings. When connecting
large numbers of loudspeakers, always choose the correct tapping for the volume required in the physical area where the
loudspeakers are fitted: e.g., speakers in quiet corridors will need a much lower power setting than those in noisy public areas.
The total power rating of all the loudspeakers connected to a single amplifier channel should not exceed the maximum power
that the channel is intended to provide (see section on “Power Sharing” on page 5) and should never exceed 500 W under
any circumstances.
Each channel has a switchable 65 Hz hi-pass filter, selected by rear panel DIP switches. Programme material with high levels
of low frequency may saturate the loudspeaker transformer cores, causing unpleasant distortion. We recommend that the
filters are left in their factory setting of ON (switches down) if the relevant channels are being used for loud music. It may be
possible to switch the filters OFF for other types of programme, but this should be assessed by listening tests. (Note that on
the CV6160, switches 7 and 8 are not used.)
The maximum volume in each area can be adjusted with the preset LEVEL controls: each amplifier channel has its own control.
Input routing
In common with other Cloud power amplifiers, each amplifier channel can either be fed with a signal from its own input (the
factory default setting), or with the signal feeding another channel. This allows the same input signal to feed several channels
without the need for input connectors to be wired in parallel. CV Digital models with fewer channels are obviously restricted
in the range of routing options available in comparison with models with more channels.
The rear panel INPUT ROUTING DIP switches are used to select input source for each channel, except Channel 1. The factory
default setting is with all switches UP, which connects the input of each amplifier channel to the same-numbered input
connector, as indicated on the upper row of numbers. Setting a switch DOWN parallels the input of that amplifier channel with
the input of the amplifier channel indicated below the switch.
Notes:
•
Switch 1 is inoperative on all models
•
Switches 7 and 8 are inoperative on model CV6160
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Example 1 (all models):
To feed Channels 1 and 2 with the same source, connect the source to Input 1 and set Switch 2 DOWN.
1
2
CH
I/P
1
CH1
CH2
INPUT 1
INPUT 2
Example 1
Example 2 (models CV4250 up):
To feed Channel 1, 2, 3 and 4 with the same source, connect the source to Input 1 and set Switches 2, 3 and 4 DOWN.
CH1
CH2
INPUT 1
INPUT 2
1
2
3
4
CH
1
2
1
CH3
CH4
INPUT 3
INPUT 4
Example 2
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Example 3 (models CV4250 and up):
To feed Channels 1 and 3 with the left signal from a stereo source, and Channels 2 and 4 with the right signal (thus forming a
pair of stereo amplifiers), connect the left signal to Input 1, the right signal to Input 2, and set switches 3 and 4 DOWN, leaving
switch 2 UP.
CH1
CH2
INPUT 1
INPUT 2
1
2
3
4
CH
1
2
1
CH3
CH4
INPUT 3
INPUT 4
Example 3
Connecting Remote Control Plates
CV Digital amplifiers support remote volume control by Cloud RL-1 Series remote control plates.
Each channel has a 3-pin, 5 mm-pitch screw-terminal connector (REMOTE LEVEL) on the rear panel. Connect an RL-1 using
two-core screened cable as shown:
1
2 3
REMOTE LEVEL
CONNECTOR
1 2 3
REMOTE LEVEL CONTROL WIRING
RL-1/1A
USE TWO-CORE SCREENED CABLE
Maximum reliable cable run is 100 m. An RL-1 will control the level in the channel from zero (“off”) to the maximum determined
by the setting of the rear panel LEVEL preset control.
The LEVEL port responds to a control voltage in the range 0 to 10 V DC (where 0 V produces maximum level). A DC voltage
in this range may be applied here to allow an external control system to vary the volume in each channel. Please see the
Installation and User Guide for full details.
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Using the Auxiliary Outputs
The two rear panel connectors AUX 1 and AUX 2 may be used to drive additional amplifiers, for recording, or any other purpose
where system “expansion” is required. The connectors are 3-pin, 3.5 mm-pitch screw terminal type.
The signals at the auxiliary outputs are balanced and line level, and can thus be use to drive most external equipment directly.
The connector pinout is identical to that used for the amplifier inputs:
1
3
2
OUTPUT: BALANCED
CONNECTION
scn
cold (-)
hot (+)
1
3
2
OUTPUT: UNBALANCED
CONNECTION
hot (+)
scn
(DON’T CONNECT PIN 2)
The factory default sources for outputs AUX 1 and AUX 2 are the signals routed to the inputs of Channels 1 and 2 respectively.
It can be seen from the Input Routing examples from page 9 that in practice this means that AUX 1 will always carry the
signal applied to INPUT 1, and AUX 2 will always carry the signal selected by INPUT ROUTING DIP switch 2 - either that
applied to INPUT 1 or that applied to INPUT 2.
Note also that the sources for the auxiliary outputs are effectively derived “post” the rear panel channel (the factory default
setting) preset controls, and thus the LEVEL controls for Channels 1 and 2 will vary the output level at AUX 1 and AUX 2
respectively.
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