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Take the main outputs into a stereo input (or a pair of mono inputs) on the Peavey - without knowing which Peavey I cannot tell you further info re set-up but as you'll be sending line level signal you'll need to back off the gain on the channels you input to on the Peavey
Without more information of your speakers and amps we can't really help you. The Mackie board puts out line-level signals and that should drive any connected amp or powered speaker to the full capability. Make sure you are using BALANCED interconnect lines either XLR or TRS cables. Use of TS unbalanced cables costs you 6 DB and also noise pickup. Make sure ALL your gear, amps, speakers etc are powered from a SINGLE receptacle or power conditioning module. Normally you will use the AUX outputs of the mixer by way of TRS cables or balanced lines in a snake to power amplifiers onstage which then connect to the stage monitors. If you have powered monitors the returns of the aux to the stage go to the powered monitors. A heavy duty extension cord brings power back from thee stage power to the mixer.
The mixer is stereo and the amp is mono. The line level out of the mixer MAY overwhelm the KB2 regular inputs so try running the mixer into the PA input jack.
The amp is doing what is called "motorboating". This is usually caused when the voltages to sensitive preamp stages are inadequately filtered or regulated and the sudden load of the output stages cause a dip in the voltages sent to the preamps which in turn vary the input to the output stages starting the cycle over. This will require electronic troubleshooting and if your not skilled in that, then it is NOT a DIY fix. What you are seeing is NOT normal, there is a defect.
I don't believe there is a mute function on the XR684F unit. There is a mute on the XR8600 but they probably use different boards in it. The mute button for the XR8300 and XR8600 are near the effects selector button and LIKELY is board mounted and would not have a J111 connector. If the electrical function is in the XR684, it MAY just be pads like test points, to only be used during testing and troubleshooting.
Buy a powered stage monitor and gonnect to the MON jack. You will select the channels to go to the monitor with the AUX knobs and the overall level with the MON slider.
Use BALANCED lines to the powered monitor... This is a TRS plug at the mixer end for sure...
REMEMBER to power ALL interconnected equipment from the same receptaacle or source, even if it means running an extension from where your speakers are plugged in to the mixer !!! The ground bounce between power receptacles within a building can destroy your equipment's sensitive input circuits.
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