I use FBass, Musicman, and Warwick basses........... Some amps have this trait and some don't. My experience is an amp that sounds great in a store or even in the living room sounds too doinky when cranked up at stage volume. The Eden was worst and my Sunn 2000s is the least offensive. Now sometimes I will pur a SansAmp BDDI in the blend and it helps to reduce it, nut then I loose definition...... Should I be using a Para EQ somewhere?? The funny thing is that it seems to not be an issue toward the end of the night. This happened with a vintage SVT, Mesa 400+, Eden, Trace and Bassman 135... BUT NOT with an Acoustic 370, Sunn 2000S, and SOME with a V-4. IS it just tone stack? My Bass?? High volume??