ULD-15 MkII

About the ULD-15 MkII

The Velodyne ULD-15 mkII is a high-performance, self-powered subwoofer featuring a 15-inch cone driver with 5/8 inch linear travel, servo-controlled amplifier, and modular active crossover. It offers a frequency response of 18Hz to 85Hz within ±3dB and can produce 104dB at 20Hz with less than 1% total harmonic distortion. The system includes a separate power servo control unit and is designed for floor-standing placement with a down-firing driver. The cabinet measures 17 inches wide by 22.5 inches long by 18.25 inches high, with a volume of 2.59 cubic feet and weighs approximately 57 lbs. The amplifier is a high-efficiency discrete Class B design delivering 400 watts RMS continuous power. The crossover frequencies and phase can be adjusted via plug-in resistors by a dealer. The ULD-15 mkII was introduced in the late 1980s and is noted for its fast, powerful, and low-distortion bass performance, making it suitable for audiophile and home theater applications. It was originally The system is finished in walnut, oak, or black with hardwood edges and legs with concealed rollers. The servo control unit connects via RCA and includes protections against open/short circuits, low voltage, and excessive signals. Placement is critical for optimal performance, as reported by users.