Products › Martin Audio HTKCT04 Steel Mountable Pole for XP118 Subwoofer Speaker Image 1 of 1 Martin Audio HTKCT04 Steel Mountable Pole for XP118 Subwoofer Speaker $40.00 sold out Sold Out Added! The HTKCT04 from Martin Audio is a steel mounting pole for BlacklineX and BlacklineXP Powered loudspeakers and subwoofers.Material: Powder coated steelDiameter: 35mm (25.98")Length: 660mm (1.38")Weight: 0.73 kgs (1.6 lbs) The HTKCT04 from Martin Audio is a steel mounting pole for BlacklineX and BlacklineXP Powered loudspeakers and subwoofers.Material: Powder coated steelDiameter: 35mm (25.98")Length: 660mm (1.38")Weight: 0.73 kgs (1.6 lbs)