Focal SUB 1000 F Manuel D'utilisation page 19

SUB 1000 F
U s e r m a n u a l
19
connections
Using the "low-level" rcA inputs
When a 2-channel amplifier with pre-out line outputs are used, the subwoofer should always be connected
to the stereo RCA inputs "Left/Right LINE INPUTS" (fig. A).
Using the lFe input
When a multi-channel audio/video amplifier is used, the subwoofer's single LFE input should be
connected to the audio/video amplifier's "Subwoofer" output if there is one (fig. B).
positioning the subwoofer in the listening room
Contrary to loudspeakers, which have to be placed at a sufficient distance from the walls and corners of
the listening room, we recommend positioning the subwoofer in a corner (fig. C, D).
If the subwoofer is positioned against only one wall or far away from the walls, the very long wavelengths
of the low frequencies will cause the random excitation of room resonances. The frequency response
will not be linear and the quality of the bass will be seriously affected (lack of depth, tinny sound, poorly
defined and/or poorly held bass, difficult or impossible overlap crossover with other loudspeakers).
By placing the subwoofer in a corner, the room resonances will be excited in a more linear and predictable
way. Not only will bass perception be optimal, but this arrangement will also make it possible to boost the
bass level by + 6 dB (fig. E).
If for practical reasons you aren't able to place the subwoofer in a corner, experiment positioning the
subwoofer in different places within the room until you find the best compromise.
Generally speaking, it is better to place the subwoofer towards the front of the room.
As the frequency ranges involved are in principle omnidirectional, the bass is not affected by objects or
furniture placed between the subwoofer and the listening point.