User Guide

CA Series Installation & User Guide v1.2
7
Clearly better sound
OverviewOverview
Introduction
The Cloud CA Series is a range of versatile multi-channel
audio power ampliers of advanced design, able to drive low
impedance loudspeakers, or high impedance (100 V-line or
70 V-line) loudspeaker distribution systems directly. They
are ideal for sound reinforcement applications in the retail,
leisure, hospitality, commercial or industrial sectors.
Models CA2500, CA4250, CA6160 and CA8125 are capable
of delivering 1 kW of audio power. In high impedance (70/100
V-line) mode, this maximum power rating can be shared
between channels in an intelligent manner, allowing the
ampliers to drive different types or numbers of loudspeakers
in the various areas of a building or venue with maximum
economy. Model CA2250 can deliver a maximum of 500 W
of audio power, which may be similarly shared between its
two channels.
The range comprises ve models which, with the exception
of Model CA2250, differ only in the number of channels. The
gure in the “POWER” column below represents the power
that can be delivered to a four or eight ohm load when all
channels are equally driven:
MODEL CHANNELS POWER
CA2250 2 2 X 250 W
CA2500 2 2 X 500 W
CA4250 4 4 X 250 W
CA6160 6 6 X 160 W
CA8125 8 8 x 125 W
CA Series ampliers can be used on an Audinate Dante™
AoIP network with the addition of a CDI-CA digital
input card, available as a separate retrottable option.
CDI-CA cards are available in 2, 4 and 8-channel versions,
and t the rear panel expansion bay. Full installation and
conguration instructions are suppled with each card. Visit
www.cloud.co.uk, navigate to Resources > Manuals for
full information.
Particular design attention has been paid to the ampliers’
energy efciency. The Class D output stages dispense with
line output transformers, and consequently offer great
savings in weight and size over earlier designs. An automatic,
two-stage power-down feature (APD) mutes the amplier if
no input signal has been detected for 15 minutes, and then
enters an ultra-low-current standby mode if no input signal
has been detected for 25 minutes; in this latter mode the
power consumption is less than 2.5 W. The ampliers also
include a remote standby/wake up function, enabling them
to be placed into standby mode - and subsequently powered-
up again - by a simple external contact closure. The APD
feature can be disabled by a rear panel DIP switch.
Safety features of the design include output DC detection,
overcurrent protection, and thermal monitoring. A switch-
on delay provides loudspeaker protection at power-up. All
models use variable–speed forced-air cooling.
Applicable Models
This Installation Guide describes the installation and operation
of the following models:
• Cloud CA2250: 2-channel amplier, low impedance and
70/100 V-line outputs, total rating 500 W
• Cloud CA2500: 2-channel amplier, low impedance and
70/100 V-line outputs, total rating 1 kW
• Cloud CA4250: 4-channel amplier, low impedance and
70/100 V-line outputs, total rating 1 kW
• Cloud CA6160: 6-channel amplier, low impedance and
70/100 V-line outputs, total rating 1 kW
• Cloud CA8125: 8-channel amplier, low impedance and
70/100 V-line outputs, total rating 1 kW
Wherever the term “CA Series amplier” or simply “amplier”
is used in this manual, it may be assumed that the information
is applicable to all the above models. Where information is
specic to one (or more) models only, clear reference to the
relevant model type(s) will be made.
NOTE: Cloud amplier models CV2500, CV4250 and
CV8125 are NOT covered by this Guide.