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Serious Humming/Feedback

I recently purchased a brand new Numark Mixdeck Express midi controller. I connected it the other night at a gig to my QSC K12 speakers using XLR cables. On the rear of the controller are 3 XLR outputs that say BALANCED. I connected regular XLR cables (microphone cable) and ran it to the left and right speakers separately. I then tried to power up the speakers and they would not turn on.

Troubleshooting a Tascam 22-4 playback issue

I owned this reel-to-reel machine from when I purchased it new years ago. I want to restore it.
One issue I'm having is when playing back recordings I'm not getting audio out of track one. The VU meter shows audio is present. Other tracks are fine.
If anyone can provide some tips to for finding the root cause of failure that would be appreciated.
Thanks,
Paul

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