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Skytec SPJ1500 - 178.015 Manual

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CABLE CONNECTIONS
This range of speakers features 4-p loudspeaker connectors. These connectors are hooked in a parallel
“loop-through” configuration for connection to additional speakers. For optimum performance it’s important to
use cables specifically designed for speaker use. Do not use shielded “guitar” signal cables for connection to
these speakers.
Selection of the appropriate wire gauge is important for system operation. A cable that is too light will result
in amplifier power being wasted due to the series resistance of the cable. In addition, loss of low-frequency
performance may be experienced due to a degraded damping factor. The chart below illustrates the
appropriate minimum wire gauge for various cable lengths and speaker impedance combinations.
When using this chart, keep in mind that two 8 Ohm parallel linked speakers will equal a 4 Ohm load (see
“looping speakers”).
Looping speakers
Running too many speakers from a single amplifier channel may result in damage to the amplifier and/or in
degraded audio performance. To calculate the combined impedance of multiple identical speakers in parallel,
please use the formula below:
Impedance of a single speaker
--------------------------------------------------------- = Amplifier load
Number of speakers connected in parallel
Refer to your power amplifiers owners manual, for information on minimum recommended load impedance.
INPUT PANEL
Loop through capability (12” & 15” version only)
The two jacks on the rear panel of this series of speakers are wired parallel. This means whatever you plug
in to either of the two jacks is available to “patch out” from the other jack to another loudspeaker.
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