Hertz Marine HMS 10 S4-LD-SW.1 10 Inch Sub 4 Ohm RGB LED Subwoofer 300w RMS
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The Hertz Marine HMS 10 S4-LD-SW.1 is a 10 inch (250 mm), 4 ohm marine subwoofer rated at 300W RMS (600W peak), with an integrated RGB LED sport grille and infinite baffle mounting. It is part of the Hertz Marine HMS range and is sold as a single unit.
This listing is for the SW.1 (sport grille) version. The Hertz Marine HMS 10 is also available with a standard grille as the Hertz Marine HMS 10 S4-LD-G.1. The RGB LEDs are controlled using the HM RGB 1 BK accessory.
Key specifications
- Size: 10 inch (250 mm)
- Power handling: 300W RMS, 600W peak
- Impedance: 4 ohm
- Mounting depth: 116 mm (4.56 in)
- Voice coil: 50 mm (2 in)
- Xmech: ±19 mm
- Weight: 5.1 kg
- Protection: IP65, ASTM-D4329 UV resistance, ASTM-B117 salt fog
- Lighting: integrated RGB LEDs
- Sold as: single
Hertz Marine HMS 10 S4-LD-SW.1
The HMS 10 S4-LD-SW marine subwoofer is designed for infinite baffle installation — no dedicated enclosure required — delivering powerful, precise bass in any vessel. The sport grille features built-in RGB LEDs and can be removed and painted to match your boat.
The motor and suspension are optimised for high-power, infinite baffle operation, with long linear excursion for high output and low distortion. Adding a dedicated subwoofer also offloads the lowest frequencies from your main speakers, improving overall system performance.
Features
- Integrated RGB LED lighting, controllable via the HM RGB 1 BK accessory.
- Sound-transparent sport grille, easily removable and paintable for a custom finish.
- Hertz Pure Marine Certified: IP65 protection, ASTM-D4329 UV resistance, and ASTM-B117 salt fog operability.
- Long-throw 50 mm (2 in) voice coil engineered 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.
- FEM-optimised high-excursion motor assembly encapsulated in a marine-grade polymer injected basket.
- Gold-plated, corrosion-resistant brass connection terminals with silicone cap protecting the leadwire junction.
Explore the full range in Subwoofers.
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) |
| No Filter Component | 4Ω SPORT LED 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 S4-LD-SW.1
Hertz
About the Hertz HMS 10 S4-LD-SW.1
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 S4-LD-SW.1 need a subwoofer box?
A: No. The HMS 10 S4-LD-SW.1 is designed for infinite baffle (open baffle) mounting, so it can be installed in a boat panel or bulkhead without a dedicated enclosure.
Q: What impedance and power rating is the HMS 10 S4-LD-SW.1?
A: It is a 4 ohm subwoofer rated at 300W continuous and 600W peak power handling.
Q: Is the HMS 10 S4-LD-SW.1 sold as a single or a pair?
A: It is sold as a single subwoofer. The box contains one HMS 10 S4-LD-SW.1.
