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MPA Series User Manual v1.1

When this transformer is in circuit it is strongly

recommended that the amplier’s 65 Hz high pass lter is

set ON (see section below: High pass lter).

High pass lter

A high pass lter is provided to protect speakers,

transformers etc. from the effects of low frequency signals.

The lter is enabled by the internal jumper J2 (see g.7). The

lter 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 re service requirement to mute the music

signals from a re alarm control panel when an alarm

condition arises. The MPA Series ampliers 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 amplier, powered by the re alarm

control panel. Other arrangements may exist depending

on the design of the re control system and the re alarm

installation company should be consulted when making the

connection. The MPA Series ampliers 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 g.6.

Bose® Equalisation Modules

MPA Series ampliers 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 g.7) for the location

of the Bose EQ module connector and its associated bypass

jumper J3.

To install an EQ module, proceed as follows:

Switch off the power and isolate the unit from the 1.

mains.

Remove the top panel.2.

Remove jumper J3 from the main pcb.3.

Plug the Bose® equalisation module onto its connector; 4.

note that the connector has two notches on one

side which engage with lugs on the module’s mating

connector to ensure correct orientation.

Replace the top panel. 5.

REMOTE MUSIC MUTE TERMINATIONS

1 2

MUSIC MUTE

INPUT

RELAY

NORMALLY OPEN (NO)

CONNECTION

1 2

MUSIC MUTE

INPUT

RELAY

NORMALLY CLOSED (NC)

CONNECTION

g.6: Remote Music Mute

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Cloud MPA SERIES Guía de usuario Pagina 10

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