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6
Connections
the left and right speakers simultaneously.
Additionally, the crossovers are now con-
nected so that the crossover switches can
be adjusted to your requirements. You must
adjust the crossovers on each speaker with
this hook-up.
Optionally, a jumper of wire may be
connected between the L+ and the R+;
and between the L- and the R-. This con-
nects both voice coils of the CM8SW,
giving you a 2dB increase in output.
Since each subwoofer’s impedance
drops from 8
Ω to 4Ω, make sure your
amplifier is 2
Ω stable to accommodate
the satellite speaker’s impedance.
(See
Figure 6)
.
Very Large Subwoofer Array
(VLSA)
Using four or more CM8SW subwoofers
in a system creates a system of unprece-
dented clarity, with stunning bass impact
and potentially extraordinary maximum
volume capability. Because of the
extremely low impedance of a parallel
VLSA system, multiple channel amplifiers
are normally used to power them.
Because of this, in-wall volume controls
are incompatible with VLSA systems.
In a system of this type, it is recommended
that the satellite speakers be driven full
range (or with an external electronic
crossover) by a separate amplifier channel.
Connections are straight-forward; two
conductor wires connect each amplifier
channel to each individual subwoofer.
(See Figure 7).
Each CM8SW has a jumper installed to
parallel the voice coils for maximum effi-
ciency.
(See Figure 6).
The crossover controls on each subwoofer
affect only the subwoofer response. Level
controls on the amplifiers facilitate blend-
ing and compensation for placement.
Speaker Wire
For most applications, we recommend you
use 16 or 18 gauge wire. For wiring runs
longer than 80 feet we recommend 14
gauge wire. The No-Strip speaker wire ter-
minals can accommodate 12-20 gauge
wire. When you run wire inside walls, spe
-
cial jacketing (CL-2 or CL-3) is required to
both protect the wire and for fire preven-
tion. In some areas conduit is required. For
a trouble-free installation, low voltage wire
such as speaker wire must be run in accor-
dance with the National Electrical Code
and any applicable provisions of the local
building code. Consult your local Niles
dealer or your building contractor if you are
unsure of code requirements in your area.
Figure 6
Connecting the two voice coils in parallel with a
jumper (a piece of speaker wire).
Figure 7
Connections to a VLSA are normally made from
each CM8SW to a multi-channel amplifier like
the Niles SI-1230 twelve channel amplifier.
WR+
W
R–
L–IN R–IN
CM8SW
L
L
C
C
H
H