Hi guys thanks for the input I'm taking all this on board. Barefaced claim that the Big Twin to be the loudest speaker that they do but my problem is 2x10 Big Twin or 4x10 Vanderkley or Genz Benz, Purple Chilli Bla! bla! It gets a bit confusing...... My main problem is volume. I'm playing with a V loud drummer Swing stuff RnR, Rockabilly, Reggae and an Elvis gig so some electric bass as well. I have recently got the GK1001 and have been using a GK RB800 with a 400w 4x10 but the 300w that the RB800 chucks out isn't loud enough. Can the drummer turn down i can almost hear you ask?? Not when he's being Ronnie Tut i shouted.....the search continues.....all advice great fully received Cheers!!!