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Hookup Guide for CBT 70J-1/70JE-1 Arrays
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.
(also applies to CBT 70J/70JE original version)
-OR-
Important: Connect cabinets in
parallel with each other. Hookup
polarity must be maintained as shown.
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Related Manuals for JBL CBT 70J-1
Summary of Contents for JBL CBT 70J-1
- Page 1 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.
- Page 2 Why Proper Hookup is Crucial – For proper functioning of the array, the proper phase relationship must be maintained between the low-frequency (LF) drivers in the CBT 70J-1 and the LF drivers in the CBT 70JE-1. The low-frequency drivers must work together in a certain way, and this parallel hookup is required for accomplishing that.
- Page 3 The reason that the CBT 70JE-1 drivers go up so high in frequency (up to 800 Hz) is that the CBT 70J-1 by itself behaves as a line array that has a total height of 70 cm (28 inches). Based on that height (and some other factors, such as the coverage switch position), the vertical coverage typically starts broadening around 800 Hz.
- Page 4 Using with External Subwoofer – There are some applications where you may need more – or deeper – bass than the CBT 70J-1/70JE-1 array can provide, so you may want to add an external subwoofer. For these applications, you can add a high-pass filter but it absolutely must be before the signal gets to the power amplifier.