HK AUDIO L SUB 4000 APowerful and Versatile 18? subwoofer, 1200 W, 31 Hz X Over, 137 dB half space, 1x 18? (4 ohms) with 4? Voice Coil, Birch Multiplex 15 18 mm, 9 13 ply L SUB 4000A A LOW END BOOST FOR THE LINEAR SERIES L SUB 4000 A A LOW END BOOST FOR THE LINEAR SERIES L SUB 4000 A is a flexible 18? double vented bandpass subwoofer. Compatible with all LINEAR 5 fullrange speakers and mid high units, its powerful low end ranging from 30 to 100 Hertz is totally and