Connections; Internal Wiring - JBL VTX Series User Manual

7 - CONNECTIONS

The VTX B18 is equipped with four Neutrik NL4 SpeakON connectors, two at the rear for the cabinet and two at the front grill. All four
NL4 connectors are wired in parallel and can be used interchangeably. The NL4 connectors at the front of the B18 are typically used
when B18s are setup in a cardioid configuration, when some of the enclosures are pointed backwards. All NL4 connectors are installed
upside down so that the NL4 locking pin position can be seen from under the array.
Front NL4 Connectors : IN/OUT
A channel selection switch is available at the rear of the B18 that allows for selecting between Pins 1 and 2 of the NL4 connector/cable.
The switch is wired after the four NL4 connectors and affects all connections equally.

7.1 INTERNAL WIRING

FRONT NL4
1+
1-
2+
2-
1+
1-
2+
2-
CAUTION: Always use high-quality insulated speaker cables made by reputable manufactures. Keep cable length as
short as possible with sufficient gauge for the application.
REAR PANEL NL4
1+
1-
2+
2-
1+
1-
2+
2-
16
VTX B18 | User Manual
Rear NL4 Connectors : IN/OUT
Compact Single 18" Subwoofer
IN/OUT
A
Channel Selection
Channel Selection Switch
Pin Selection
Switch
A B
B18
IN/OUT
B SN
SUB