MRA-2 & MRA-4 Installation Manual
Declaration of Conformity
The MRA4 and MRA2 Multiroom amplifiers have been designed and independently tested to be in compliance with the following standards:
Safety - EN60065:1993/IEC65, EMC-EN55013:1990, EN50082-1:1997, EN61000-3-2:1995, EN61000-3-3:1995
Systemline Amplifier (MRA-4 & MRA-2)
Important Safety Information
Read all the instructions before connecting or operating the power amplifier. Pay particular attention to safety information. Keep this
manual in a safe place so you can refer to these safety instructions.
WARNING:
There are no user serviceable parts inside this unit. Refer all servicing to qualified service personnel.
WARNING:
To reduce the risk of fire or electric shock, do not expose the amplifier to moisture or water. Do not allow foreign objects to get inside
the enclosure. If moisture or water, or a foreign object gets into the enclosure, immediately disconnect the power cord from the wall.
Take the unit to a qualified service person for inspection and necessary repairs.
The unit should only be connected to a power supply only of the type and voltage stated on the rear of the unit.
The unit should only be cleaned using a dry cloth or a vacuum cleaner.
The amplifier should be placed on a fixed level surface, strong enough to support its weight. Keep the amplifier away from radiators,
heat registers, stoves and any other appliance that produces heat.
If the amplifier is placed in an enclosure, there must be sufficient ventilation of the enclosure to ensure proper cooling. Keep all ventilation
inlets clear, especially the fan inlet on the rear of the unit. Anything placed on the unit should have sufficient clearance, to allow for
airflow.
Connect the amplifier to the power outlet only with the supplied 3-pin grounded power supply cable or an exact equivalent. The cable
should be connected to a properly grounded 3-pin wall outlet. Do not modify the supplied cable in any way. Do not use extension cords.
Do not route the power cord where it will be crushed, pinched, bent at severe angles, exposed to heat, or damaged in any way. If the
power cord shows any signs of wear or damage, immediately disconnect from unit and obtain a proper replacement from a qualified
service agency, or from the Systemline service department.
If the amplifier shows signs of improper operation, or if it has been dropped or damaged in any way, immediately disconnect the power
cord from the wall. Take the amplifier to a qualified service person for inspection and necessary repairs.
The unit should not be placed near high outputs of RF signals, as this will affect the performance of the amplifier.
Heed all the warnings and safety information in this manual, and on the product itself. They are there to protect you.
GUARANTEE
All products are covered be a 2 year guarantee for parts and labour. Site visits are not covered by this guarantee and will normally result
in a call-out charge if such a visit is deemed necessary.
Configuration and Set-up, Troubleshooting
09
Bass and Treble adjustment
Depending on the speakers and the room acoustics you may wish to alter the amplifier's frequency response. This can be achieved by
adjusting the individual bass and treble controls via the front panel.
The best way to set these controls is to have a source playing through the amplifier and slowly adjust the bass and treble controls until
the desired lift or cut in response is achieved. Clockwise adjustment will cause frequency response "lift", and anticlockwise adjustment
frequency response "cut".
Note:
There is no click centre position for "flat" response. The bass and treble controls should be returned to a midway position between
maximum and minimum to return to a flat response if required.
- Speaker Switching
If two pairs of speakers have been connected to one of the amplifiers then they can be switched in the following way:
PRESS SPEAKER
SWITCHING
BUTTON
PRESS SPEAKER
SWITCHING
BUTTON
PRESS SPEAKER
SWITCHING
BUTTON
PAIR A ONLY
PAIR B ONLY
PAIR A AND B
- Fan Operation
Both the MRA4 and MRA2 have an internal fan to provide automatic forced air cooling when the amplifier is under load. The fan is
temperature operated and under most conditions will be off or running at half speed. The level of fan assistance used will depend on
both the temperature of the surrounding environment and the level at which the amplifier is being operated.
Troubleshooting Tips
Question: Why when I turn the unit ON are there no LED indicators illuminating?
Check the mains cord is fully "home" in its socket, and that the mains switch is ON at the AC outlet. Also check that the amplifier's fused
inlet has the fuse correctly inserted and of the correct rating. You should find two fuses in the fuse draw, one of which is a spare.
Question: Although I've connected different sources to each Line-In on the MRA-4, I hear the same source in both amplifier zones, why?
Make sure that the COM-INPUT switch at the rear of the amplifier is set OFF. The second switch down should be set to its Right Hand
position. Always ensure that the amplifier is switched OFF when you change the switch settings.
Question: The amplifier is ON and the "signal" LED is glowing but I don't hear any sound, why?
a) Check which output the speakers are connected to and then ensure that the Green "speaker active" LED is illuminated for the amplifier
and pair output connected.
b) Check that the source connections are in the LINE IN sockets and not the LINE OUT.
c) Ensure if using an S4.3 controller that the Zone is activated and the source is playing.
d) Check that the Level control is not set at minimum.
Question: Why does the amplifier switch itself off a few minutes after the music stops?
The amplifier will be set to Music Sensing mode. If you want the amplifier to always be active you will need to set the MUSIC SENSING
feature OFF. The switch is at the rear of the amplifier and should be set to its Right Hand "OFF" position.
Declaration of Conformity, Safety
