I hear exactly what you are saying Bill. However, I did say that I had no clue about this sort of thing hence my initial post. I can't add the Mesa 1X12 extension cab as my combo is 4ohms rated and not the 8ohms version. If it was the 8ohms version I would quite happily add the extension cab. Therefore, what can I do to achieve to get greater volume. Please remember I am dense about abs and sensitivity etc.