Simply because the sound from your amp is great onstage doesn't mean it's awesome at the back of the house or wherever the soundman is. P A cabinets react differently than bass cabinets, and microphones do as well. The size and architecture of the house changes the sound. If having yoiyr bass ound ezxactly the way it does out of yoyr amp is critical to you, it's best to sit down with the band and the soundcrew and reach a consensus. Personally, I trust the FOH people to make the bass sound good through the PA, and if I have clarity and punch onstage, I'm happy. I heard Chris Squire with Yes last July and I thought his Rickenbackers sounded horrible through the PA -- overwhelming clank with little definition and no punch. I can't believe that's the way the bass sounded onstage, but maybe it did. If I were Chris, I would not have been satisfied. The best bass sound I've heard recently was Nate Query of the Decemberists, and he's using a small amp onstage that he runs just loud enough to hear himself. The rest is all DI.