I always have people telling me that i should put my 4/10 cab on top of my 15 cab but i have a loss of hearing, so what i do is point my 4/10 to audience and turn my 15 to me and stage personel then i don't have to turn up so loud to here myself and they hear me on stage don't run bass in monitors, only through mains. plus i feel this helps in tone through 4/10 to audience. Is there some technical reason I should'nt run this way ? Note my 4/10 twice as loud as my 15.