@agedhorse
@honeyiscool
Let's contextualize this scenario. If you have horns or acoustic instruments being supported by a Ampeg 810, something's gone wrong. In a situation like that the more realistic setup would be a something much smaller.
At the same time, in a situation where you would be more likely to see a 810, you would have double 412 stacks running full bore. Wouldn't the exact same bleed problem exist with both? Yes a guitar has less low end, but a fuzzed out 6 string in C or B is still dumping some pretty woofy lows into the room, would it?