I recently picked up a 260 mini stack. It sounds great but farts on the E string once the volume is around 4 or 5. I would be a little more understanding if it had that side effect around 9 or 10, but I don't think the 260 should be putting out such floppy and distorted tone at a lower volume. I was wondering if putting a louder speaker in there would help. I was thinking of an Eminence speaker around 150 watts. Right now it's a 100 watt head and a 100 watt speaker. I thought maybe the amp was driving the speaker too much because it seems like a pretty powerful amp for it's size. Would putting a slightly louder 10 inch in there be helpful or beneficial? Or would there be another way to get rid of the farting tone?