These custom built speakers are super efficient 96 db at 1 watt, 400 watts RMS not peak, so you don't need lots of power to drive them, however they'll take lots of power, celestion horn and mid, Phillips 15" bass, adjustable crossovers They sound incredible 30.5"X19.5"x13.3/4" They cost over $2000 years ago so are a steel at this price, can easily be used for PA. Text only pls