Niles Audio CM8SW manual Very Large Subwoofer Array Vlsa, Speaker Wire

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 8Ω to 4Ω, make sure your amplifier is 2Ω stable to accommodate the satellite speaker’s impedance. (See Figure 6).

	L
	L	C
	C
	H	H
	CM8SW
L–IN	R–IN

Figure 6

Connecting the two voice coils in parallel with a jumper (a piece of speaker wire).

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).

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.

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.

Connections

6