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move the speaker farther away from the
listener, both the reflected and the direct
sound will dissipate, requiring more
power from your surround sound amplifier
channels. If the surround sound system
you are using has a small five or ten watt
amplifier for the rear speakers, stay within
five to eight feet of the listening location. If
you are using a 25 to 50 watt amplifier
you can mount the speakers 10 to 15 feet
away from the listening location and still
achieve reasonably high volume levels.
In large or unusually shaped rooms this
might be the only way to achieve a good
effect. If you like to listen to music sur-
round modes which emulate concert hall
acoustics, more than two surround speak-
ers will prove extraordinarily effective
(See Figure 6). With Niles DS6.3, DS6.5
and DS6.7 loudspeakers it is easy to add
another pair without affecting the decor of
the room. However, you will need to use
a much more powerful amplifier than that
which is built into a typical surround
sound receiver or amplifier. Niles makes a
number of Systems Integration Amplifiers
with proprietary features that make them
uniquely suited to enhance a good sur-
round sound system. Consult your local
Niles dealer for more information.
The Boundary Effect
Corners can affect the bass response of the
speaker powerfully! This is called the
boundary effect. You will emphasize par-
ticular bass frequencies and cancel out
other bass frequencies when you place
speakers close to the wall/ceiling bound-
ary or a corner wall boundary. This can
make the speaker sound excessively
boomy and inaccurate to some listeners,
while to others it just seems like more bass
sound. A good rule of thumb is if you
always listen to your current pair of speak-
ers with the bass turned up, you’ll enjoy
corner placement. If you keep your tone
controls at neutral, try to keep the speak-
ers at least two or three feet from the
boundaries of the room.
8
Speaker Placement
Figure 5
Varying Listening Position
Figure 6
Surround Sound