FSR-15 vs ULD-15 MkII
The ULD-15 MkII's power @ 8ω is 400W against the FSR-15's 250W. Both share low-frequency extension (18 Hz), woofer (15"), and ways (1).
AI-generated product photo — not official manufacturer imagery.
The Velodyne FSR-15 is a high-performance powered subwoofer designed for home theater and music applications. It features a 15-inch forward-firing woofer with a 3-inch voice coil and a 210 oz. magnet. The subwoofer uses an accelerometer-based servo control system to ensure extreme accuracy in bass reproduction, minimizing distortion and improving transient response. It includes a built-in 250 watt RMS Class AB amplifier capable of delivering 750 watts peak power. The frequency response ranges from 18Hz to 120Hz ±3dB, providing deep and tight bass. The unit offers adjustable low-pass crossover (40 to 120Hz), selectable high-pass crossover outputs (80 or 100Hz), variable volume control, and selectable phase control (0° or 180°). Inputs and outputs include line-level RCA and speaker-level with 5-way binding posts. Additional features include signal sensing auto on/off (defeatable) and multiple staggered low-pass crossovers with steep roll-off for precise filtering. The cabinet dimensions are approximately 20" H x 21.75" W x 17.5" D, and it weighs about 98 lbs (45 kg). This subwoofer is known for its outstanding sound quality, capable of delivering deep, distortion-free bass even at high volumes, making it suitable for audiophile and home theater use.
Driver and acoustic performance characteristics
Amplification power output and characteristics
Driver configuration and enclosure design
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
Estimated price (community-sourced)
Around — community and catalog average, updates slowly
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The ULD-15 MkII's power @ 8ω is 400W against the FSR-15's 250W. Both share low-frequency extension (18 Hz), woofer (15"), and ways (1).
The HGS-12's power @ 8ω is 1.3kW against the FSR-15's 250W, its high-frequency extension 125 Hz against 120 Hz, and its low-frequency extension 20 Hz against 18 Hz. Both share ways (1).
The SPL-1000IIB's power @ 8ω is 1.0kW against the FSR-15's 250W and its low-frequency extension 24 Hz against 18 Hz. Both share high-frequency extension (120 Hz) and ways (1).
The SPL-120's power @ 8ω is 300W against the FSR-15's 250W, its high-frequency extension 125 Hz against 120 Hz, and its low-frequency extension 24 Hz against 18 Hz. Both share ways (1).
Aperion Audio Intimus S-12
Sunfire HRS-10
The specs and the pairings above are open to everyone. Sign up and you get the system builder, the assistant, a compatibility check against the gear you already own, and a watch on this product so a price or pairing change reaches you.
Sign up free