Many people think of a soundcheck as the time when a performer gets their voice and/or instrument ready in the hours or minutes before a concert. District residents may have to expand that definition to include Soundcheck DC, a nightclub on K Street where the music is ready to be heard. Opened in August 2015, the venue features a top-of-the-line sound system, lasers, two disco balls and LED screens. And more than that, the club brings in local and nationally known DJs to spin the best in hip hop, house and Latin music. METRO: McPherson Square