Owner`s manual
8
• Do not use any cleaning agents or chemical solvents when cleaning, as these could damage the 
surface of the device.
• Repairsmustalwaysbeconductedbyqualifiedspecialists,asyoumightotherwisebeexposedto
dangerous high voltage levels or other hazards.
THE ACTIVE SUBWOOFER MAGNAT QUANTUM 731A
This subwoofer has been adapted to provide the best visual and acoustic match to the MAGNAT Quantum 
range of loudspeakers. However, it goes without saying that it may be combined with other loudspeakers. 
When connecting your loudspeaker, please make sure that everything has been switched off. Furthermore, 
make sure that all loudspeaker cables are connected to the proper poles, i.e. the positive pole for the 
output is connected to the positive pole for the input and the negative pole with the negative pole. Please 
also refer to your receiver‘s/amplifier‘s and loudspeakers‘ instructions.
POSITIONING
The frequency range reproduced by the subwoofer cannot be pinpointed by the human ear. That‘s why 
positioning generally doesn‘t present any problems. However, it is preferable to place the speaker close 
to the front loudspeaker in front of the listening position. You should also make sure that the distance from 
the sides and from the rear to items and walls is at least 20 centimetres as otherwise bass reproduction 
may be impaired. 
THE SUBWOOFER‘S OPERATING ELEMENTS (FIG. 1)
Mains connection (1)
The subwoofer is equipped with an integrated amplifier and needs to be connected to a mains outlet by 
means of the supplied mains cable. 
Operating mode switch (2), operating state LED (3), power switch (4)
Power switch ON Power switch OFF
Operating mode 
switch ON
Subwoofer is in permanent operation, the LED is green. 
Favourable setting for the reproduction of programmes 
with long quiet passages (this prevents the subwoofer 
from switching off unintentionally).
The subwoofer is 
switched off, LED is off.
This is the setting for 
when subwoofer isn’t 
used over long periods.
Operating mode 
AUTO
The automatic switching on/off is activated 
(recommended setting).
The subwoofer switches on automatically when it 
receives a signal from the receiver, the LED turns 
green. 
It automatically switches to standby after receiving no 
signals for some minutes, the LED turns red.
AV input “LFE/SUB“ (5)
Connect your receiver‘s low-level subwoofer output (sub-pre-out) to the subwoofer‘s AV input (see Fig. 
2). You will require a mono-cinch cable for this (not supplied).










