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I thought that I had better add a bit. On these units the actual muting part of the circuit is on the Class D amp/ power supply card. The front panel DSP card controls this via the ribbon cable, centre pin nearest the edge of the front panel input card. If the screws that hold the connectors to...

This disables the auto off. One of the faults that I have had is that the amp switches off even with a signal applied. Stays on for a minute or so and then goes to sleep. Hearsay has it that JBL had endless problems with this unit: intermittent faults, noise etc. In Australia the warranty...

On the PRX715 discontinued input/ control panel with the DSP card 'PRX700 Full Range V6' manufactured around mid 2013 and no longer available, there is a ribbon cable to a 26 way header; two rows of 13 pins. This carries + and - 15V DC from the power amp/ power supply, audio signal and ground...