Often the A channel power output blows. CEASE using the unit immediately until repaired as continued use can have additional damage to power supply.
Any problem with speakers can blow the channel as there is real weak insulation on a multi-layer circuit board in the rear most amp (channel A). It burns and takes out three transistors on the HCA2400 module inside.
ALSO read my tip on here regarding a hazard of Behringer PMP units due to the channel A connection when using Speakon to 1/4 inch plugs or adapters having the BARREL being the hot lead instead of the TIP of the 1/4 inch plug. Short that barrel to ANY ground and goodbye channel A.
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