Thanks @itu, don't panic, I'm using the amp wisely! I messaged last night as I was wondering whether it might be safe to run from two of the three outputs but I was assuming not and am not inclined to experimentation with electrics. The two cabs are to all intents the top and bottom halves of a Mesa 1516 (the top cab having 1 x 10, 2 x 6 and a tweeter) so to get the best out of the rig I was thinking about bi-amping at the next rehearsal anyway, driving the 15 with the Mesa and the 10/6/6 with the Ashdown, probably safer and more satisfactory all round 👍