Our living room is about 6x5 meters. Listening on my own (parents would usually have it quieter), I'm probably about 1/2 power with the set up we have.

On their website, Crown suggest:

    Nearfield monitoring: 25 W for 85 dB SPL average (with 15 dB peaks), 250 W for 95 dB SPL average (with 15 dB peaks)
    Home stereo: 150 W for 85 dB SPL average (with 15 dB peaks), 1,500 W for 95 dB SPL average (with 15 dB peaks)
    Folk music in a coffee shop with 50 seats: 25 to 250 W
    Folk music in a medium-size auditorium, club or house of worship with 150 to 250 seats: 95 to 250 W
    Folk music at a small outdoor festival (50 feet from speaker to audience): 250 W
    Pop or jazz music in a medium-size auditorium. club or house of worship with 150 to 250 seats: 250 to 750 W
    Pop or jazz music in a 2000-seat concert hall: 400 to 1,200 W
    Rock music in a medium-size auditorium, club or house of worship with 150 to 250 seats: At least 1,500 W
    Rock music at a small outdoor festival (50 feet from speaker to audience): At least 1,000 to 3,000 W
    Rock or heavy metal music in a stadium, arena or ampitheater (100 to 300 feet from speaker to audience): At least 4,000 to 15,000 W