I have a similar sonic problem in the Pink Floyd band I am in. The other guitarist has never been in a band and is a computer guy by trade.
He runs his guitars through a computer simutation thingy into studio monitors. The vocals and electronic drums also go into these same speakers. Certainly not ideal for a vintage David Gilmour sound.
I suggested he run his computer stuff through his Fender amp, as the speaker is voiced as a guitar speaker and not a reference speaker (if that makes any sense-I'm not too up on modern processing and stuff).
Well he got pretty defensive and I just gave up.
If his simulation is also modeling an amp and cabinet, using a flat-response, full-range (FRFR) speaker is actually the preferred approach.
