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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.
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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.
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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.
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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.