Introduction
This manual covers the Systemline Multi-room Amplifiers, the MRA-4 and MRA-2. The MRA-2 is a two channel
version of the four channel MRA4. These units have been designed specifically to meet the demands of the
custom installation market for high power and performance. Special features such as music sensing, tone
controls and cool running ensure easy installation and use. Both amplifiers use the same high quality chassis
and front panel as the S4.3 controller providing an ideal match.
Features
MUSIC SENSING
This feature saves power by ensuring the amplifier is switched to standby when no audio signal is present.
INDEPENDENT LEVEL CONTROLS
Tamper proof front panel adjustment of the audio volume that can be used for level matching, or setting of a maximum volume limit.
BASS & TREBLE CONTROLS
Enables adjustment of the frequency response to the user's preference and also helps to compensate for room acoustics. Tamper proof
front panel adjustment.
SPEAKER SWITCHING
Easy connection of a second pair of speakers to each stereo amplifier. A simple button press from the front panel controls the output
to both speaker pairs. Front panel LED indicators show speaker output status. The amplifier also remembers the speaker settings when
it is switched off. BFA speaker plugs are provided.
SIGNAL MONITOR
Front panel LED illuminates when an audio signal is present at the amplifier's input. This helps when checking source connections
and wiring.
LOOP THROUGH STEREO INPUTS
Line Out sockets are provided for each Line Input. This enables easy daisy chaining when you want to add more than one MRA-4 or
MRA-2 amplifier to a Zone.
SUPER COOL OPERATION
An advanced power supply reduces heat output by up-to 60% at low to medium power levels when compared to conventional class AB
amplifiers. When high output powers are demanded a microprocessor controlled fan ensures that the amplifier stays cool under the most
stressful conditions.
EASY CONFIGURATION
If you want to drive both stereo amplifiers in the MRA-4 with the same audio signal, there is no requirement for extra leads or adapters.
A "Common Input" configuration switch is provided on the rear panel.
HIGH PERFORMANCE
The MRA-4 features a powerful 600VA power supply and the MRA-2 a 350VA unit. Long cable runs and high quality speaker systems are
easily driven. Both units are fully protected against short circuits and thermal overloads, and are designed specifically to deliver long
term reliability and performance in the toughest installations.
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MRA-2 & MRA-4 Installation Manual
Introduction & Features
02
Configuration and Set-up
07
- Line Output Connections
When connecting multiple MRA-2 or MRA-4 amplifiers together, additional units can receive their LINE IN signal feed from the AMP LINE
OUT sockets of the previous unit. An additional shielded Phono to Phono cable should be taken from the LINE IN Right and Left sockets
on the receiving amplifier to the LINE OUT Right and Left sockets on the sending unit.
- Speaker Output Connections
The speaker connections on the rear of the MRA-4 AND MRA-2 amplifier use BFA style speaker sockets. Supplied with the amplifier are
a set of black and red BFA speaker plugs to enable the proper termination of the speaker cables.
To terminate the speaker cables first split the cable into its left and right channels halves. By convention the right channel should be
terminated into the RED connector. Strip back approximately 7mm of insulation from the cable to leave bare copper. Insert the cable
into the cable entry point on the plug as indicated on the diagram and use a small flat bladed screwdriver.
Locate the correct speaker outputs for the appropriate zone, and push the BFA plugs securely home.
1
2
3
SCREWDRIVER
BFA PLUG
CABLE
S P E A K E R S
PA I R 1
PA I R 2
LINE IN
L I N E O U T
A M P
R
L
R
L
MADE IN ENGLAND
SERIAL NO -
MRA2
STEREO ROOM AMPLIFIER
POWER CONSUMPTION 300W MAX
230V
50Hz
I M P O R TA N T : K E E P A L L V E N T S C L E A R O F O B S T R U C T I O N
MUSIC SENSING
I M P E DA N C E- 4 - 1 6
Ω
230V T3.15AH 250V
110V T5AH 250V
MRA
ON/OFF
CD
S P E A K E R S
PA I R 1
PA I R 2
LINE IN
L I N E O U T
A M P
R
L
R
L
MADE IN ENGLAND
SERIAL NO -
MRA2
STEREO ROOM AMPLIFIER
POWER CONSUMPTION 300W MAX
230V
50Hz
I M P O R TA N T : K E E P A L L V E N T S C L E A R O F O B S T R U C T I O N
MUSIC SENSING
I M P E DA N C E- 4 - 1 6
Ω
230V T3.15AH 250V
110V T5AH 250V
MRA
ON/OFF
OUT
R
L
LINE OUT to
LINE IN sockets
BFA plug
and assembly format
