Cloud Electronics MPA60 - Manual (Page 7)

MPA Series User Manual v1.2 7
Music Inputs
The unit has six stereo line inputs; these inputs are suitable
for most music sources such as compact disc players, tape
players, satellite receivers and the like. Each stereo input is
summed internally to mono.
All inputs are unbalanced and use RCA phono sockets. The
input impedance is 47k ohm.
Line 6 input can be configured to have priority over any
other music source, see Music Priority, page 8.
Sensitivity & Gain Control
All six stereo line inputs have a preset gain control on the
rear panel adjacent to the respective input sockets. The gain
control has a range of 20 dB allowing the input sensitivity to
be varied from -12 dBu (200 mV) to +8 dBu (2.0 V).
The preset gain control should be adjusted so that all the
input signals are operating at the same level and that the
front panel level control has an optimum range of control.
Music Source Select
This front panel six position switch is used to select the
desired music signal. Remote control of source selection is
possible with a remote control plate (RSL-6), See fig.4.
Music Level Control
A front panel mounted music level control is provided.
Remote control of music level is possible by connecting a
remote control plate (either RSL-6 or RL-1), See fig.4.
Remote Control of Music Source
Select and Level
The MPA Series mixer-amplifiers are compatible with
standard Cloud remote control plates Types RSL-6 (music
source select and level) and RL-1 (level only).
Either type of plate may be connected at the rear 3-pin
5 mm-pitch screw terminal connector (Remote Music
Control), using the wiring shown in fig.4.
Use two-core (RSL-6 or RL-1) or single-core (RL-1 only)
screened cable to connect the remote level plate (max
length 100 metres).
Pressing the button adjacent to the rear panel connector
activates the remote control plate and disables both the
front panel level and source select controls. If an RL-1 is
being used, the internal jumper J4 should be moved from
its default ‘SW’ setting to ‘FR’, to override the disabling of
the front panel source select switch. See fig.7
for location of
jumpers.
1 2 3
REMOTE MUSIC
CONTROL
CONNECTOR
1 2 3
REMOTE LEVEL CONTROL WIRING
RL-1
SINGLE-CORE SCREENED CABLE MAY BE USED
1 2 3
REMOTE MUSIC
CONTROL
CONNECTOR
1 2 3
REMOTE SOURCE & LEVEL CONTROL WIRING
RSL-6
USE TWO-CORE SCREENED CABLE
fig.4: RL-1 and RSL-6 Wiring
1 2 3
+
-
SCN
1 2 3
+
SCN
BALANCED CONNECTION UNBALANCED CONNECTION
MIC INPUTS
PIN 1: SCREEN (GROUND)
PIN 3: HOT/PHASE (+)
PIN 2: COLD/ANTIPHASE (-)
fig.5: Microphone Input Wiring