Hey, if you want to opamp roll to try and mask another problem that's fine by me but unless you change the opamp to something that rolls off the treble or otherwise causes the amp to not have its ruler-flat frequency response I'm just saying I don't think you'll hear a substantial difference in the overall presentation. The M3 is a very resolving amp, you've probably never had one like it, so now you're finding that some of your other components are not its equal.