I'm thinking about getting a Hartke Kickback combo amp and don't know whether to get the 12" or 15" speaker. I'm planning to play my double bass through this amp which is why I'm leaning towards the 12" for a more natural tone. However, I do plan to play an electric bass through it eventually and I will also be playing with a drummer. At 120 watts apiece can anyone explain why I would want to go with the 12" over the 15" or vice versa? Will the 12" be loud enough to cut through the drummer?