Cloud 46 Series User Manual

46 Series Installation and User Guide V1.0
18
Outputs
Speaker Outputs
The power amplier stages are fully protected against DC
offset and output over-current, and also have two-stage
thermal protection. Activation of the protection circuitry
mutes the power amplier stage until the fault condition
clears. All protection conditions will automatically self-
clear once the fault condition is removed, or if the amplier
is power-cycled. The exception to this is muting due to
detection of DC at the output terminals, which will require
manual power-cycling to clear. A switch-on delay function
mutes the output during power-up and power-down to
protect loudspeakers.
Each zone of a 46 Series mixer-amplier has both a low
impedance output (4 or 8 ohms) and a high voltage output
for 70/100 V-line speaker systems. Both output types are
available on the four 3-pin 5 mm-pitch screw-terminal
SPEAKER OUTPUTS connectors
27
. The four zones may
be congured independently, but in each zone, only one
output option can be used at a time. The output type is
selected with SPEAKER CONFIGURATION DIP switch
28
:
see details below.
The following connection notes apply to each of the four
zone outputs.
Connecting to Lo-Z loudspeakers
For low-impedance operation, set SW2 to ON (switch down).
The mixer-amplier can deliver its rated power into a 4 ohm
or 8 ohm load: set SW3 up (4 ohms) or down (8 ohms) as
appropriate. Installers tting multiple low-impedance
loudspeakers (generally 8 ohms) should employ series and
parallel wiring to produce, where possible, a total load
impedance of either 4 or 8 ohms.
IMPORTANT: Under no circumstances should
the total load impedance be less than the
output impedance selected with SW3
(i.e., 4 or 8 ohms).
For low-impedance operation, wire the SPEAKER OUTPUT
connector according to (a) or (b) in the diagram below.
Connecting to 70/100 V-line systems
46 Series mixer-ampliers’ output stages use a
transformerless design which can directly drive 70 V-line or
100 V-line loudspeaker systems. The power amplier stage is
rated at 120 W per-zone (Model 46-120MK2) or 240 W per
zone (Model 46-240).
Connect to a 70 V-line or 100 V-line speaker system by
setting SW2 to high-Z (switch up) and setting SW3 either up
for 70 V-line operation, or down for 100 V-line operation, as
required: see (c) in the diagram below. Note that units will be
factory-set for 100 V-line operation “out of the box”..
4 ohm
loudspeaker
+
-
+
-
70 V-line or
100 V-line
speaker system
(a) Lo-Z (4 ohm)
connection
(c) Hi-Z
connection
COM
4Ω
8Ω /
HIZ
COM
4Ω
8Ω /
HIZ
8 ohm
loudspeaker
+
-
(b) Lo-Z (8 ohm)
connection
COM
4Ω
8Ω /
HIZ
70 V-line
100 V-line
OPTIONAL
OPTIONAL
OR
1 2 3
ON
1 2 3
ON
1 2 3
ON
1 2 3
ON
OR
When driving 70/100 V-line loudspeaker systems there is
a risk of transformer core saturation at high levels and low
frequencies, which can produce distortion. To prevent this,
the mixer-amplier’s output stages are provided with a 65 Hz
high-pass lter, which may be enabled by setting SPEAKER
CONFIGURATION switch SW1 to ON (switch down).

Cloud 46 Series Specifications

General

Channels	2
Signal-to-Noise Ratio	>100dB
Input Impedance	20k Ohms
Dimensions	19"
Weight	3.5kg