I have an aer amp one which is great for most gigs, but for some gigs I could do with a bit more stage volume and as I have a bag end s 15 d cab,just wondering is there a power amp I could get that I could use to go from the aer amp to the bag end cab as you cannot connect an ext cab to the aer amp one,it has to be apowered sub or active cab,hence I need an amp to drive the bag end cab.Appreciate any advice on this.Many thanks.Sean.