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PLACEMENT OR POSITIONING
Your new subwoofer will work well in a variety of locations. However,
placement in your listening room will affect its performance. Since the
wavelengths of sound reproduced by your subwoofer are large compared
to its size, those sounds are omni-directional in nature. This means that
locating your subwoofer in relation to your left and right main speakers will
not affect the directional cues which they provide.
Because the sounds you hear are a combination of direct sound from
the speaker and reflected sound from the walls, ceiling, and floor of your
listening room, placement of the subwoofer in relation to room boundaries
changes the balance of what you hear at low frequencies. In that low
frequency range, the dimensions of most rooms are comparable to the
wavelengths of those sounds. As sound propagates and reflects in the
room, “standing waves” are created at frequencies where the wavelength
of sound or multiples of the wavelength are equal to one of the dimensions
of the room. At your listening position, these standing wave patterns of
reflected sound add together in and out of phase causing large variations
in the response that you hear.
As a general rule, locating your subwoofer near the corner of the room will
increase its overall output, but will excite more standing waves in the room
and may result in a more uneven response. Locating your subwoofer along
a wall will usually mean less acoustic output but a somewhat smoother
response. A middle of the room location would suggest the smoothest
response with the least output capability. Of course, any location will be a
compromise between acoustic performance and the aesthetic blend of the
subwoofer enclosure with the decor and furnishings of your room. Don’t
be afraid to experiment with the location of your subwoofer in your room for
the best results at your listening position. As with any other listening test,
use program material that you are familiar with that has substantial bass
content.
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WIRING AND CONNECTIONS
Turn off all power to your subwoofer and other equipment before
making any connections.
Installation using speaker level inputs
A) For amplifiers with one set of speaker connections.
If a preamplifier output connection is not available on your amplifier
or receiver, your subwoofer can be connected using your equipment’s
speaker outputs. These connections are made using commonly available
18 or 16 gauge lamp cord or speaker hook-up wire. Observe correct
polarity by connecting red(+) to red(+) and black(-) to black(-) for both left
and right channels. Connect your amplifiers speaker output terminals to the
subwoofer’s speaker level input terminals as well as to your main stereo
speakers according to Figure B.
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FIGURE B
R
- +
L
+ -
-
+
Right
Speaker
Left
Speaker
Receiver
or
Power Amplifier
+
-