REL HT/1003 MKII 300 Watt Subwoofer – Black Insane Performance at its Size and Price – HT/1003 MKII, a.k.a. “The Hammer.” The REL HT/1003 MKII Subwoofer lives up to that nickname with ease. Built for home cinema systems that demand real impact, it delivers powerful, fast bass from a compact enclosure—adding depth and realism without overwhelming your room. Compact Size, Serious Impact Don’t let the size fool you. The HT/1003 MKII is built to deliver strong, room-filling bass from a relatively small footprint. It’s ideal for small to mid-sized rooms where you want impactful low frequencies without sacrificing space or balance. 300W Class D Amplifier – Clean Power on Demand At the heart of the subwoofer is a high-current 300-watt Class D amplifier. It provides the energy needed for deep, punchy bass while staying efficient and controlled. Whether it’s an explosion in a film or a dramatic soundtrack swell, the output remains tight rather than boomy. 10” CarbonGlas™ Driver – Fast & Accurate Response The front-firing 10-inch CarbonGlas™ driver is designed for speed as much as power. This lightweight yet rigid cone helps the sub react quickly to changes in sound, giving you bass that feels precise rather than sluggish. The result is a more natural listening experience where effects hit hard but remain well-defined. Twice the Output of the Original Compared to its predecessor, the MKII version pushes significantly more output—up to 50% louder, with noticeably more authority. This improvement comes from upgraded driver materials and amplifier design, allowing it to handle demanding scenes with ease while keeping distortion low. PerfectFilter Technology – Balanced, Extended Bass REL’s PerfectFilter system helps extend bass performance into deeper frequencies while maintaining clarity higher up the range. This means you get both rumble and detail—so bass guitars, cinematic effects and ambient soundtracks all feel more lifelike. An integrated analogue subsonic filter also removes unwanted ultra-low signals that can strain the driver, helping maintain cleaner output and improving long-term reliability. Built for Home Cinema Performance Unlike general-purpose subs, the HT/1003 MKII is tuned specifically for home theatre use. It delivers bass that feels fast, dynamic and engaging—enhancing action scenes, dialogue clarity and overall immersion without muddying the soundstage. Stylish, Modern Cabinet Design Finished in a clean Black cabinet with subtle detailing, this subwoofer is easier to place in modern interiors than many traditional designs. The rigid, vibration-resistant enclosure reduces unwanted resonance, helping maintain clarity even at higher volumes. Easy Setup & Room Adjustment Fine-tuning is straightforward thanks to clearly labelled controls on the rear panel: Level control to match output with your speakers Crossover adjustment for smooth blending Phase switch to align timing with your setup Auto power function for convenient operation These features make it easier to get the best performance in different room layouts. Optional Wireless Upgrade For a cleaner setup, the subwoofer is compatible with REL’s optional HT-Air wireless system (sold separately). This allows you to connect without long cables, while maintaining low latency and strong signal quality—ideal for flexible room placement. Key Features at a Glance 300W Class D amplifier for powerful, controlled bass 10” CarbonGlas™ front-firing driver Designed for home theatre performance PerfectFilter technology for extended, balanced low frequencies Analogue subsonic filter for cleaner output Up to 50% more output than the previous model Compact cabinet ideal for small to mid-sized rooms Adjustable controls for easy setup Optional wireless connectivity (HT-Air system) Stylish Black finish to suit modern interiors A Smart Upgrade for Home Cinema If your current setup lacks depth or impact, the REL HT/1003 MKII is a noticeable step up. It adds weight, clarity and excitement to everything you watch—without taking over the room. A well-balanced subwoofer that does exactly what it should, and does it properly. REL HT/1003 MKII Subwoofer Specs Sheet REL HT/1003 MKII Subwoofer User Manual What's in the Box? REL HT/1003 MKII Subwoofer, Black Mains lead User manual Technical Specifications Type Closed box, front-firing driver Active driver size and material 10 in., 250mm long-throw, CarbonGlas™ cone structure, inverted carbon fibre dust cap, steel chassis Passive radiator size and material N/A Low frequency extension -6dB at 24 Hz Input connectors Dual-purpose low-Level stereo RCA or LFE RCA Output connectors Daisy Chain low-Level stereo RCA or LFE RCA Power output 300 watts (RMS) Amplifier type NextGen5 Class D Wireless capability HT Air Wireless (Optional), Zero Compression Single Large Scale Integrated Chip Dual parametric filter N/A Protection System Fully electronic set safe Yes D.

C. fault Yes Output short Yes Mains input voltage 220-240 volts, 110-120 volts for certain markets Fuses 2.5 Amp semi delay 230b, 5 Amp semi delay 115b operation Appearance Dimensions (W x H x D) 12.5 x 13.7 x 13.8 (318mm x 347mm x 351mm) Net weight 34.2lbs. (15.5kg), shipping weight 41 lbs. (18.6 kg) Finish Horizontally Oriented Lined Grained Black Composite Cabinet, 15mm Top Plate, finished in 5 coats of Hand rubbed High Gloss Black Lacquer Product information Product code HT/1003-MKII-Black EAN 0857316005621 REL HT 1003 MKII 300 Watt Subwoofer - Black, REL, HT, 1003, MKII, 300, Watt, Subwoofer, Black, HT1003MKII-BK, REL HT1003MKII-BK, HT-1003, REL ACOUSTICS HT1003, ht1003 II, ht/1003, rel ht/1003