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Re: JBL JRX118SP POWERED SUB. Getting power and signal...
There's a 8-pin ic located right at the side of output devices & power supply filter caps, that is a common issue with JRX active subwoofers, hope it helps.
For some reason the soft on protection circuit has failed. it is not a simple fix and would require the amplifier module to be removed from the speaker to assess the damage.
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I'd have to know the make and model mixer to properly advise you. In general, if I were you, I'd come out of the L/R mixer outs to the JBLs and run the sub from an aux send set to post faders.
However, I would suggest getting a different sub. That one will not keep up with the eon's.
You would probably need 4 of them to get close to matching.
Looks like it takes regular home theatre speaker wire. If this is a powered speaker (like a JBL eon g2), then all you need is a passive mixer, and connect the speakers to the mixer. If this is not a powered (amplified) speaker, then you will need an amplifier to boost the sound source and drive the speakers, so you would connect the mixer to the amplifier, then the amp outs to the speakers.
For some reason the soft on protection circuit has failed. it is not a simple fix and would require the amplifier module to be removed from the speaker to assess the damage.
First thing is to use an ohmmeter to check the voice coil of the speaker to make sure it is not blown open. After that it is into the shop for amplifier repair.
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