Q Acoustics Concept Series User Manual page 8

Preparation
Foam Bung
The Concept Series speakers are rear ported and designed to work best with
some space behind them i.e. 200mm or so away from a wall. If you position your
speakers close to a wall/corner then the foam bungs should be inserted into the
rear ports or there could be too much bass.
Ensure bungs are fitted snugly into the port without inserting them too far.
You will find the level of bass is reduced but definition and bass extension is
increased. Experiment to see what you prefer and try making small changes to
the position of the speaker to optimise the final result.
Positioning
Concept 40
The Concept 40 loudspeakers should be positioned at least 200mm from a back
wall and 500mm from the side walls. Placing the speakers closer to the wall
will increase bass but could cause the sound to boom and lack precision and
detail. The speakers should be 2m - 4m apart and central to the seated listener.
Turning the speakers slightly inwards will sharpen a stereo image but may cause
narrowing of the sound source.
Concept 20
The Concept 20s are ideally mounted on Concept floor stands. If you are stand
mounting, a simple guide is that the treble unit should be at ear level to a seated
listener. Stand mounted speakers should be treated as floorstanding speakers
except that the speaker may be placed a little closer to the back wall. Shelf
mounting is also possible. Be prepared to experiment to find the best setup for
your taste in your particular listening room.