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VTX B18 | User Manual
10 - SYSTEM AMPLIFICATION & WIRING
Like all other VTX systems, the VTX B18 subwoofer is powered exclusively by Crown I-Tech HD amplifiers, providing optimum per-
formance and consistency across the world. All B18 processing is performed using the I-Tech HD’s internal processing, so no other
external DSP is required. The Crown amplifiers include a user-adjustable input section for room correction equalization, array size com-
pensation and circuit adjustments.
Standard JBL presets are available for both the Crown I-Tech 4x3500HD and Crown I-Tech 12000HD. The most up-to-date presets are
available for download from the www.jblpro.com website and are always bundled in the latest version of JBL’s Performance Manager
TM
control software.
10.1 - B18 USING CROWN I-TECH 12000HD
When using Crown Audio I-Tech 12000HD amplifiers, up to four VTX B18 (2 x per channel) subwoofers can be powered per amplifier.
Based on the B18 component resource requirements, this allows for optimum power-to-transducer ratio without compromising the
maximum SPL capabilities of the system. The example below illustrates how to connect 4 x VTX B18 cabinets to a 2-channel I-Tech
HD amplifier using standard 4-conductor NL4 cables. One NL4 cable is used to connect the amplifier to the first B18 cabinet and then
standard 4-conductor NL4 jumpers are used to connect all the cabinets together. The channel selection switch at the back of each B18
is used to assign each cabinet to the appropriate amplifier channel. Two B18s are set to A (channel 1, Pin1) and two B18s are set to B
(channel 2, Pin 2).
A
B
A B
A
B
A B
Channel Selection
Switch
JBL VTX B18
Crown I-TECH HD
NL4 Cable
Amplifier Rear Panel
Amplifier Channels
Channel 1 B18 1&2
Channel 2 B18 3&4
CAUTION: In this configuration, only the Channel-1 NL4 connector can be used on the I-Tech 12000HD amplifier. The
Channel-1 NL4 connector is wired to both Channel-1 and Channel-2 were Channel-2 includes only Channel-2.
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