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6
Connections
Now, the volume control will raise and
lower the volume for the subwoofer and
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 subwoofer
with this hook-up.
Optionally, a jumper of wire may be con-
nected between the L+ and the R+; and
between the L- and the R-. This connects
both voice coils of the PSW800, giving
you a 2dB increase in output. Since each
subwoofer’s impedance drops from 8
Ω to
4
Ω, make sure your amplifier is 2Ω stable
to accommodate the satellite speaker’s
impedance.
(See Figure 6).
Very Large Subwoofer Array
(VLSA)
Using four or more PSW800 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 PSW800 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 spring loaded terminals of
the PSW800 speakers will accommodate
up to 12 gauge wire directly. Larger sizes
can be accommodated via pin connectors.
When you run wire inside walls, special
jacketing (CL-2 or CL-3) is required to both
protect the wire and for fire prevention. In
some areas conduit is required. For a trou-
ble-free installation, low voltage wire such
as speaker wire must be run in accordance
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).
LEFT— IN
RIGHT— IN
L
WF WF
SW2
SW1
C
H
H
C
L
–
PSW-800 PASSIVESUBWOOFER
SI-1230
Subwoofers
Figure 7
Connections to a VLSA are normally made from
each PSW800 to a multi-channel amplifier like
the Niles SI-1230 twelve-channel amplifier.