For rehearsals, my band got a
Jamhub. We each get our own headphone mix, and to anyone not plugged in, the loudest instrument by far is the singer's voice.
Live, our best experiences have been running both guitar and bass direct with no backline, hearing ourselves only through the monitor wedges. Guitarist uses a load box/digital cab simulator (
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We are definitely in the heavier end of the metal genre (prog-ish, death-ish, djent-ish), so that's certainly no excuse.