System Amplification & Wiring; B18 Using Crown I-Tech 12000Hd - JBL VTX Series User Manual

10 - SYSTEM AMPLIFICA TION & 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 around 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
control software.

10.1 B18 USING CROWN I-TECH 12000HD

When using Crown I-Tech 12000HD amplifiers, up to four VTX B18 (two per channel) subwoofers can be powered by each amplifier.
Based on B18 component resource requirements, this allows for optimum power-to-transducer ratio without compromising the maxi-
mum SPL capabilities of the system. The example below illustrates how to connect four VTX B18 cabinets to a two-channel I-Tech HD
amplifier using standard four-conductor NL4 cables. One NL4 cable is used to connect the amplifier to the first B18 cabinet and then
standard four-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, pin 1) and two B18s are set
to B (channel 2, pin 2).
Amplifier Channels
Channel 1 B18 1&2
Channel 2 B18 3&4
Amplifier Rear Panel
Crown I-TECH 12000HD
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, where Channel 2 connects only to Channel 2.
www.jblpro.com website and are always bundled in the latest version of JBL's Performance Manager
NL4 Cable
VTX B18 | User Manual
JBL VTX B18
21
Channel Selection
Switch
A
B
A
B
A B
A B