Yes, connecting 4&5 to ground will turn on the power supply.
On your second point, please be aware I only use 1 unit, not a pair.
Having a single switch for both units would be possible, but I'm not sure how you need to wire it.
On your second point, please be aware I only use 1 unit, not a pair.
Having a single switch for both units would be possible, but I'm not sure how you need to wire it.
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