Hertz Marine HMS 10 B4-LD-W 10 Inch Sub 4 Ohm RGB LED Subwoofer 300w RMS
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The Hertz Marine HMS 10 B4-LD-W is a 10 inch (250 mm) long-throw marine subwoofer with integrated RGB LED lighting, rated at 300W RMS (600W peak) with a 4 ohm single voice coil. It is designed for infinite baffle installation, sold as a single unit in a white finish, and is part of the Hertz Marine HMS range.
This listing is the white finish HMS 10 B4-LD-W. The HMS 10 B4-LD is also available in black as the HMS 10 B4-LD-C. The RGB LEDs are controlled with the separately available HM RGB 1 BK controller.
Key specifications
- Size: 10 inch / 250 mm
- Power handling: 300W continuous, 600W peak
- Impedance: 4 ohm, single voice coil
- Voice coil diameter: 50 mm (2 inch)
- Depth: 116 mm (4.56 inch)
- Lighting: integrated RGB LED
- Mounting: infinite baffle (no enclosure required)
- Finish: white
- Sold as: single unit
The HMS 10 B4-LD-W is a long-throw marine subwoofer engineered for infinite baffle installation. It takes over the lowest frequency range from the main speakers, adding bass output and punch to maximise overall system performance. The FEM-optimised high-excursion motor assembly uses a 50 mm (2 inch) voice coil driven by a substantial magnetic group, maintaining precise control even at very high SPL levels. The subwoofer has been engineered and tested against UV exposure, salt-fog, vibrations, water spray, thermal shock, and dust.
Features
- Engineered and tested for marine environments: UV, salt-fog, vibrations, water spray, thermal shock, and dust.
- Integrated RGB LED lighting, controllable via the separately available HM RGB 1 BK controller.
- Long-throw 50 mm (2 inch) voice coil, designed for infinite baffle use, with a polypropylene cone injected with UV inhibitors and a co-moulded Santoprene surround.
- Progressive-design aramid fibre spider with silicone-insulated lead wires for durability and consistent performance over time.
- FEM-optimised high-excursion motor assembly driven by a substantial magnetic group, housed in a marine-grade polymer injected basket.
- Gold-plated, corrosion-resistant brass connection terminals with silicone cap protecting the lead wire junction point.
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Specification
| Size mm (in.) | 250 (10) |
|---|---|
| Power Handling | - Continuous W 300 |
| Power Handling | - Peak W 600 |
| Impedance | Ohm 4 |
| Depth mm (in.) | 116 (4.56) |
| Voice Coil | Type single |
| No Filter Component | SUBWOOFER |
| Voice Coil | Ø 50 (2) |
| Magnet | size D x d x h mm (in.) 140 x 60 x 30 (5.51 x 2.36 x 1.18) |
| Weight | of one component kg (lb.) 5,1 (11.24) |
| Magnet | High density flux ferrite |
| Cone | Polypropylene with UV inhibitors |
| Xmech mm (in.) | ±19 (0.75) |
What's Included
- HMS 10 B4-LD-W
Hertz
About the Hertz HMS 10 B4-LD-W
From our tech experts at CEN
Marine-grade 10 inch coaxial speakers handling 300w RMS, built with UV-stable materials and corrosion-resistant hardware for life in sun, salt and spray.
Who it suits
Boats, ribs and open builds, and campers with an outdoor listening area. Anything mounted where rain reaches it should be marine-rated, whatever the vehicle.
Our tech experts advise
In a marine install the wiring decides longevity: tinned cable, sealed joints and a properly fused feed. Mounting position affects the sound more than the speaker choice, because there are no cabin walls to help you. get in touch and we will talk through mounting, wiring and power for your boat.
Explore the full Hertz range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Hertz
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Frequently Asked Questions
Q: What makes marine speakers different from car speakers?
A: Marine speakers are built with UV-stable, water-resistant cones, grilles and hardware designed for open-air and wet environments. They are the right choice for boats, jet skis, hot tubs and outdoor installs.
Q: Are these speakers fully waterproof?
A: Marine speakers are water-resistant to marine ratings rather than submersible. The IP rating, where provided, is listed in the Specification tab.
Q: Do I need a marine amplifier as well?
A: For best results, yes. Marine amplifiers carry conformal-coated boards that resist moisture and salt air. Match the amplifier to the RMS rating in the Specification tab as you would with any system.
Q: Will these work outside of marine use?
A: Yes. Marine speakers are popular for motorcycles, quads, hot tubs, garden bars and anywhere the weather reaches. Their durability makes them a strong outdoor choice.
Q: Does the HMS 10 B4-LD-W need a box?
A: No. The HMS 10 B4-LD-W is engineered for infinite baffle installation, so it does not need a dedicated enclosure.
Q: How do I control the LEDs on the HMS 10 B4-LD-W?
A: The integrated RGB LED lighting is controlled with the Hertz HM RGB 1 BK accessory, available separately.
Q: Is the HMS 10 B4-LD-W sold as a pair?
A: No. It is sold as a single 4 ohm subwoofer.
