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Does a bass preamp fry a channel on an analog board?

My bass player just fried two channels on my board. He used a preamp compression pedal, into a passive DI box into an XLR channel. My formerly beautiful board smoked. It was clipping. We changed channels, DI box, cables and the second channel started to smell too. I disconnected the bass player and ran him thru my Roland keyboard amp. Please help me understand what happened!