DS18 PRO-X 8" Sealed Back Mid-Range Loudspeaker 550 Watts 8-OhmDuring the focused R&D period of perfecting the PRO EXL line, DS18 identified the opportunity to spawn off another line since there was a division amongst competition audiophiles and concert "voceteo" audiophiles. Therefore, DS18 created the PRO audio line, which features a wide variety of midranges that produce concert like sounds that will knock the wind out of you! Highlights Sealed back design which allows you to put these in boxes that have high