I have a GK400RB head with a mesa boogie 115 cab. This cab has a PAS 400w rms woofer & foster horn. I was doing a show with a new band and in the middle of soul man playing at a moderate to loud volume the cab just shut down without warning not a peep. I checked my head & cables it's definatley the cab. It's under waranty I'll be curious to find out what happened.Totally ruined my night.