JBL CBT 70J-1 User Manual

Hookup Guide for CBT 70J-1/70JE-1 Arrays
(also applies to CBT 70J/70JE original version)
For the CBT 70J-1/70JE-1 array, it is very important for the proper functioning of the array
that the cabinets be wired with the same full-range signal to both cabinets, in parallel, at
the same level
. Do not use an external crossover.
The easiest and surest way is to simply wire a jumper (speaker cable) between the two cabinets
(In same polarity: “+” to “+” and “–” to “–”) and to wire the speaker cable from the amplifier
channel to either of these sets of terminals.
Stated from the amplifier side, wire from the amplifier to one of the cabinets (it doesn’t matter
which cabinet) and use a jumper speaker wire (“+” and “-”) to run the plus and minus in
parallel to the other cabinet.
-O
R
-
Important: Connect cabinets in
parallel with each other. Hookup
polarity must be maintained as shown.

JBL CBT 70J-1 Specifications

General

Sensitivity	96 dB
Coverage Pattern	150° H x 40° V
Impedance	8 Ohms
Directivity Factor (Q)	12.7
Directivity Index (DI)	11 dB
Maximum SPL	130 dB
Nominal Impedance	8 Ohms
Enclosure	Fiberglass reinforced ABS
Net Weight	12.7 kg
Type	Line Array
Enclosure Material	Fiberglass reinforced ABS
Connectors	2 x NL4
Frequency Range (-10 dB)	60 Hz – 20 kHz

Summary

Core Hookup Principles

Parallel Wiring and Signal Integrity

Ensures same full-range signal to both cabinets for proper array function.

Jumper Cable Hookup Method

Details using a speaker cable jumper between cabinets for parallel connection.

Alternative Hookup and Performance Crucials

Home Runs Hookup Method

Describes running separate cables to each cabinet for long cable runs.

Importance of Phase Relationship

Explains why correct phase relationship is vital for array performance.

Technical Considerations and Crossover Warnings

Avoid External DSP Crossovers

Warns against external crossovers due to phase shift and performance impact.

Science of Full-Range Signal

Explains why same full-range signal is needed for constant directivity.

Advanced Configurations and Fine-Tuning

Integrating External Subwoofers

Guide on adding subwoofers with high-pass filters before the amplifier.

Protective High-Pass Filter Recommendation

Suggests using a protective high-pass filter before the amplifier.

Signal Level Adjustment Caution

Warns against adjusting bass levels via different amplifier channel signals.

Crown CDI Amplifier Specifics

Notes for using Crown CDI amplifier DSP for EQ, HPF, or subwoofer integration.