Towards the end of yesterday's band rehearsal I was fiddling with the knobs on the amp I was playing through, and by boosting the mids, turning the Drive knob on the Behringer and turning the tone knob on my P-Bass all the way up I suddenly got that heavy grinding tone that Geddy Lee and John Entwistle got on their basses. The setup = P-Bass>Behringer BDI21>Acoustic B600>Hartke 4x10, and I played with a Dunlop Big Stubby 2.0mm pick. My P-Bass is strung up with La Bella Deep Talkin' Flats, 45-105. It caught me by surprise, and our guitarist when he recognized the tone started playing "My Wife" by The Who. The drummer joined in, and we had a little impromptu jam! So that's how they got that tone! Of course, they were much louder! But since I'm in a Tom Petty tribute I'll have to return to a quieter, darker tone at the next practice.