Dynaudio pmn - Manual (Page 28)

26
PLACING THE SUBWOOFER
Placement on the floor
In the corner
Adjacent to wall
Free standing
Advantages
Gain of bass response
Gain of bass response
Position can be optimized with
regard to standing waves
Disadvantages
Excitation of most standing waves in the
room, hence very uneven sound distribution
Excitation of several standing waves in the
room, hence very uneven sound distribution
It may take up space on the floor
Overview
Floor standing
The subwoofer is under normal conditions always placed directly on the floor. This is taken into account in the basic design
and the basic settings of the AIR system.
Placement in the corner
This is a
π/2 radiation, which yields a gain of 18 dB in the frequency range
where the monitor is considered to be omni-directional.
Most standing waves have their maximum in the corners of the room.
Especially if the room has a cubic or shoebox shape (the room having all
walls in parallel). The placing of the subwoofer in the corner may cause
uneven sound distribution of the bass.
The corner position is normally only preferred if all opposite surfaces in the
room are not in parallel.
Adjacent to a wall
This is a
π radiation, which yield a gain of 12 dB in the frequency range
where the monitor is considered to be omni-directional.
This position adjacent to a wall is commonly used, and it can be OK, but it
must be noticed that the subwoofer should neither be placed in the middle or
in the quarter points between two sidewalls if these are in parallel.
(See pages 29-32 for the optimum positions with regard to standing waves.)
Free standing
This is a
π radiation, which yield a gain of 6 dB in the frequency range where
the monitor is considered to be omni-directional.
The free standing position is highly recommended in all cubic and shoebox
shaped rooms.
In any case: Try to avoid placing the woofer on the half or quarter lines
between walls.
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