Martin Audio SX218 2 x 18-Inch Passive Direct Radiating Subwoofer - Black
Rea Sound-Audio - Martin Audio Torus T1230 with SXC118 Cardioid Sub 18 forward 14” rear System powered with 1 Ikon IK42-Dante 20K DSP Amplifier superb for 15 to 30m throw for pricing
WS18X | 1000 Watt Vented Sub-Bass System | Wavefront
DSX | 2 x 18" Powered Subwoofer for MLA Compact | MLA Systems
MARTIN AUDIO XP118 18" BLACKLINE X POWERED SUBWOOFER BLACK
Martin Audio W3P - Kraft und Licht Productions
USED Martin Audio London XP118 and CCD8 Package – North State Sound