Some adjustment to the room e.q. is sometimes necessary. Yesterday I played a nursing home at 2:30 which had tile floors and glass windows all around. Last night I played a carpeted lounge at the country club. The nursing home required less high-end e.q. The cc needed the bass AND highs pumped up in order for the sound to project since there was not much hard surfaces to bounce the sound.
You have to use your ears.
For small jobs where high volume isn't necessary, I try to position the mains where I can hear them. When it's necessary to pump large volumes of music, it's best to be behind the mains and use some sort of monitors, either the keyboard speakers, earbuds, or a seperate monitor system.
DonM