LD Systems GT 18A Sub, active Subwoofer with 1x 18" Speaker, Class D amplifier with 400 Watt RMS (1200 W Peak), frequencyrange 32 - 200 Hz, 128 dB SPL max., black housing with Vinyl finish, connections: 2x XLR/Klinke Kombi In, 2x XLR out, 2x XLR Sat out with 100 Hz Lowcut, M20 flange for satellites, dimensions 510 x 680 x 710 mm, weight 48 Kg