Suppose you have two bass amps. To make it fair, they are both from the same manufacturer. One is an amp head rated at 350 watts driving a 4 ohm speaker cabinet with a 15 inch speaker. The other one is a combo amp also rated at 350 watts and it has the same 4 ohm speaker. Here is a real mind boggler for all of you electrical engineers and bass gear experts. Which rig will experience T.O.F. first, the amp/cabinet rig or the combo amp? I don't know why, but I bet the combo amp will reach the "Threshold of Farting" long before the other rig. There could be a psychological factor involved here too. I know when I stand in front of an amp/cab setup, I feel better and play better. When I stand in front of a combo amp I feel like a weiner and for that reason may be pre-disposed to noticing T.O.F more easily. I'm sure many players on the forum have experienced the nightmare of T.O.F. Were you playing a combo amp at the time?