Hertz Marine HMS 10 B 10 Inch Sub 4 Ohm Infinite Baffle Subwoofer 250w RMS
Couldn't Load Pickup availability
The Hertz Marine HMS 10 B is a 10 inch (250 mm) infinite baffle subwoofer from the Hertz Marine range, rated at 250W RMS (500W peak) with a 4 ohm single voice coil. Sold as a single unit in white.
This listing is the white finish HMS 10 B. The HMS 10 B is also available in black as the HMS 10 B-C.
Key specifications
- Size: 10 inch / 250 mm
- Power handling: 250W continuous, 500W peak
- Impedance: 4 ohm, single voice coil
- Voice coil: 50 mm (2 inch)
- Mounting: infinite baffle (no enclosure needed)
- Cone: polypropylene with UV inhibitors, Santoprene surround
- Sensitivity: 88 dB
- Sold as: single
The HMS 10 B is a long-throw 10 inch marine subwoofer engineered for infinite baffle installation. It handles the lowest frequency range, adding bass output and punch to improve overall system performance. The FEM-optimised high-excursion mobile assembly uses a 50 mm (2") voice coil driven by a large magnetic group, maintaining control at high SPL levels. The progressive-design aramid fibre spider with silicone-insulated lead wires ensures long-term durability and consistent performance. Gold-plated corrosion-resistant brass connection terminals with silicone caps protect the lead wire junction points.
Features
- Engineered and tested for real marine environments: UV, salt-fog, vibrations, water spray, thermal shock and dust.
- Long-throw 50 mm (2") voice coil, polypropylene cone injected with UV inhibitors and 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 mobile assembly driven by a large magnetic group, encapsulated in a marine-grade polymer injected basket.
- Gold-plated corrosion-resistant brass connection terminals with silicone cap protecting the lead wire junction point.
Explore the full range in Subwoofers.
Specification
| Size mm (in.) | 250 (10) |
|---|---|
| Power Handling | - Peak W 500 |
| Power Handling | - Continuous W 250 |
| Impedance | Ω 4 |
| Sensitivity | dB SPL 88 |
| Voice coil | Ø mm (in.) 50 (2) |
| Xmax mm | 13.5 |
| X-mech mm (in.) | ±19 (0.75) |
| Re Ω | 4.5 |
| Fs Hz | 41 |
| Vas l | 37 |
| Qts | 0.71 |
| Qes | 0.76 |
| Qms | 11 |
| Spl dB | 88 |
What's Included
- HMS 10 B
Hertz
About the Hertz HMS 10 B
From our tech experts at CEN
Marine-grade 10 inch coaxial speakers handling 250w 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
Recommended For You
Discover more top-rated gear, handpicked to go with what you're viewing
Hertz Car Audio Range
Hertz produces high-performance car audio systems driven by research.Music fans who attend live concerts know well the emotions that low undistorted frequencies without dynamic compression can arouse.
Looking for Installation?
At CEN we take pride in being able to share the quality of our work as well as being able to show what incredible products we have installed week on week.
Elettromedia Brands
Evolution of technology and art of sound
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 B need a box?
A: No. The HMS 10 B is engineered for infinite baffle installation, so it does not need a dedicated enclosure.
Q: Is the HMS 10 B sold as a pair?
A: No. The HMS 10 B is sold as a single subwoofer.
Q: What impedance is the HMS 10 B?
A: It is a 4 ohm single voice coil subwoofer, rated at 250W continuous and 500W peak.
