Cloud Electronics Matrix4 - Manual (Page 8)

Matrix 4 I NSTALLATION AND OPERATION MANUAL 7
16 Paging Microphone Controls
The paging microphone input is controlled by the two-band equalisation adjacent to the input
connector on the rear panel. The equalised signal is then routed to the four Zone Routing
Switches positioned on the front panel. Use these switches to configure the operation of the
paging mic in the desired zones. When one or more Cloud CPM-4 paging microphones are
connected, the routing switches should be in the off position. Removal of the tamperproof
panel reveals the pre-set paging mic level controls for each of the four zones. The paging
mic signals are not affected by any other control or function and the signal is routed directly
to the relevant zone output and amplifier stage with priority over all other signals.
17 Music inputs
The Matrix 4 operates in mono but is fitted with two stereo line inputs via conventional RCA
type phono sockets; the stereo signals are mixed to form a mono signal internally. The line
inputs are suitable for most music sources such as compact disc players, tape players and
receivers etc. All the inputs are unbalanced with an input impedance of 47k
Ω. The gain
control adjacent to the input sockets adjusts the input sensitivity from –12dBu (195mV) to
+8dB (2.0V) and this should be set to provide the optimum signal level and a balance with
the second music source, if used.
18 Selection and control of music signals
Each of the four zones has a separate music level control and adjacent music source select
switch allowing selection and control of either line 1 or line 2. In addition to this, each of the
four zones has a set of two-band music equalisation controls on the front panel that are
located behind the removable tamperproof panel. This arrangement allows the installer to
optimise the response of the music signals on a zone-by-zone basis. The music treble
control (HF) has a range of ±10dB at 10kHz and the music bass control (LF) operates with a
range of ±10dB at 50Hz. A flat frequency response is achieved with the adjustment slot in
the horizontal position.
19 Outputs
The Matrix 4 Mixer is equipped with a line level balanced output for each zone via 3-pin male
XLR type connectors. The nominal output level is 0dB (775mV) and the minimum load is
600
Ω
20 EMC Considerations
The Cloud Matrix 4 fully conforms to the relevant electromagnetic compatibility (EMC)
standards and is technically well behaved; you should experience no operational problems
and under normal circumstances, no special precautions need to be taken. If the unit is used
within close proximity to potential sources of HF disturbance such as high power
communications transmitters, radar stations and the like, it is suggested that the microphone
screen be connected to the metal shell of the XLR type connector and the input leads from
music sources be kept as short as possible.
21 Technical Specifications
Line inputs
Frequency Response 20Hz-20kHz
±0.5dB
Distortion <0.05% 20Hz -20kHz
Sensitivity
20dB range
Input Impedance
195mV (-12dBu) to 2.0V (+8dBu)
Input Gain Control
47k
Ω
Headroom >20dB
Noise
-90dB 22Hz –22kHz
Equalisation HF:
±10dB/10kHz LF: ±10dB/50Hz
16/12/02 V6.0