Cloud Electronics MPA60 - Manual (Page 10)

MPA Series User Manual v1.2 10
High pass filter
A high pass filter is provided to protect speakers,
transformers etc. from the effects of low frequency signals.
The filter is enabled by the internal jumper J2 (see fig.7). The
filter reduces the output level of frequencies below 65 Hz,
and ideally should be used if the line output transformer is
in circuit.
Music Mute
(Fire Alarm Interface)
In some installations (such as licensed premises or retail
outlets within a shopping mall), there may be a local
authority or fire service requirement to mute the music
signals from a fire alarm control panel when an alarm
condition arises. The MPA Series amplifiers include a
facility to mute the music signals only (i.e., mic inputs are
still active), via the Music Mute input. This is a 2-pin 5 mm-
pitch screw terminal connector on the rear panel, and the
contacts are fully isolated.
Activation of the Music Mute is often via a relay mounted
close to the MPA Series amplifier, powered by the fire alarm
control panel. Other arrangements may exist depending
on the design of the fire control system and the fire alarm
installation company should be consulted when making the
connection. The MPA Series amplifiers will mute on either a
contact closure at the Music Mute input (NO) or an open-
circuit (NC). Selection of NO or NC operation is made with
internal jumper J14. NO is the factory default. See fig.6.
Bose® Equalisation Modules
MPA Series amplifiers are compatible with single channel
Bose® Series II equalisation modules. EQ modules are
available to suit the following Bose® loudspeakers:
• Panaray MA12
• Panaray 402-II, 502B and 502BEX
• Panaray LT Series:
Models 3302, 4402, 9402 and 9702.
Modules to suit other models are available – please enquire.
Installation Instructions
Refer to the pcb layout diagram (see fig.7) for the location
of the Bose EQ module connector and its associated bypass
jumper J3.
To install an EQ module, proceed as follows:
1. Switch off the power and isolate the unit from the
mains.
2. Remove the top panel.
3. Remove jumper J3 from the main pcb.
4. Plug the Bose® equalisation module onto its connector;
note that the connector has two notches on one
side which engage with lugs on the module’s mating
connector to ensure correct orientation.
5. Replace the top panel.
REMOTE MUSIC MUTE TERMINATIONS
1 2
MUSIC MUTE
INPUT
RELAY
NORMALLY OPEN (NO)
CONNECTION
1 2
MUSIC MUTE
INPUT
RELAY
NORMALLY CLOSED (NC)
CONNECTION
fig.6: Remote Music Mute