Hookup Guide for CBT 70J-1 + 70JE-1 Array
2
Home Runs --
Another hookup method for accomplishing the proper parallel hookup –
albeit more costly for cable and with more potential for something to get accidentally
connected wrong – is to run two “home run” cables from the
same
amplifier channel, one
cable to each cabinet.. This method may be preferred for long cable runs because it puts more
cable “copper” between the amplifier and the speakers for lower cable resistance (for better
damping factor and less signal loss through the cable). However, it brings with it the risk that
someone might accidentally connect these two cables to two different amp channels, which
then could send different signals – or different
levels
of signals – to the two cabinets. Or it
could open the possibility of someone thinking that they can put a crossover in circuit between
the two cabinets, or any number of other potential mistakes. It is also a bit more difficult to
double-check the polarity in that simply paralleling the cabinets directly is fairly easily to
inspect visually. But if hooked up correctly, from the same amplifier channel and in correct
polarity, then this works fine.
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. If this phase relationship is not
maintained (due to not following these hookup instructions), then some aspect of the array
performance will be impaired, probably significantly.
Important:
Hookup polarity
must be maintained as shown.
Must be from SAME
Amplifier Channel
