Presently, I have an Ashdown Mag 300H head and an Avatar SB112 cabinet. The head pushes about 300 watts into the 500 watt cab and I was thinking of getting another cab but I'm not sure if it will be too underpowered. The head is around 300 watts but an additional cab would make two cabs in the range of 1000-1200 watts. Is this severely underpowered or would I just have to keep the volume down and watch out for clipping? Also, could I just buy another head and use it together with the Ashdown head? In other words, can I use two heads and two cabinets but one head per cabinet?