Hertz Marine HMS 12 S4-LD-G 12 Inch Sub 4 Ohm RGB LED Subwoofer 500w RMS
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The Hertz Marine HMS 12 S4-LD-G is a 12 inch (300 mm) 4 ohm single voice coil marine subwoofer rated at 500W RMS (1000W peak), with a sport grille and integrated RGB LED lighting. It is designed for infinite baffle mounting, so boat owners can add deep bass without building a dedicated enclosure.
This listing is for one subwoofer (sold as single). The HMS 12 range is also available as the 2 ohm version Hertz Marine HMS 12 S2-LD-G, and the SW grille version Hertz Marine HMS 12 S4-LD-SW. The RGB LEDs are controlled using the HM RGB 1 BK accessory.
Key specifications
- Size: 12 inch (300 mm)
- Mounting depth: 140.6 mm (5.54 in); overall depth 191 mm (7.52 in)
- Power handling: 500W RMS, 1000W peak
- Impedance: 4 ohm, single voice coil
- Voice coil: 65.5 mm (2.6 in)
- Magnet: high density flux ferrite, 156 x 80 x 40 mm
- Weight: 7.6 kg
- Protection: IP65, ASTM-D4329 UV and ASTM-B117 salt fog
- Grille: sport, with integrated RGB LEDs
About the HMS 12
The HMS 12 is optimised for open baffle (infinite baffle) applications, delivering deep, punchy bass without a dedicated enclosure. It is available in 2 ohm and 4 ohm single voice coil versions, both rated at 500W continuous power handling. The sport grille features built-in LEDs and can be painted to match your vessel. The motor and suspension are engineered for high-power infinite-baffle use, with long linear excursion for high output and low distortion. By handling the lowest frequencies, the subwoofer also takes the load off your main speakers, improving overall system performance.
Features
- Integrated RGB LED lighting, controlled via the HM RGB 1 BK accessory.
- Sound-transparent sport grille, easily removable and paintable to suit your boat.
- Hertz Pure Marine Certified: IP65 protection, ASTM-D4329 UV resistance, and ASTM-B117 salt fog operability.
- Long-throw 65.5 mm (2.6 in) voice coil with polypropylene cone injected with UV inhibitors and co-moulded Santoprene surround, engineered for infinite baffle use.
- Progressive-design aramid fibre spider with silicone-insulated lead wires for durability and consistent performance.
- FEM-optimised high-excursion motor assembly housed in a marine-grade polymer injected basket.
- Gold-plated, corrosion-resistant brass connection terminals with silicone cap protecting the leadwire junction.
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Specification
| Size mm (in.) | 300 (12) |
|---|---|
| Power Handling | - Continuous W 500 |
| Power Handling | - Peak W 1000 |
| Impedance | Ohm 4 |
| Depth mm (in.) | 191 (7.52) |
| Mounting depth | mm (in.) 140.6 (5.54) |
| Voice Coil | Type single |
| No Filter Component | 4Ω SPORT LED SUBWOOFER |
| Voice Coil | Ø 65.5 (2.6) |
| Magnet | size D x d x h mm (in.) 156 x 80 x 40 (6.14 x 3.15 x 1.57) |
| Weight | of one component kg (lb.) 7,6 (16.8) |
| Magnet | High density flux ferrite |
| Cone | Polypropylene with UV inhibitors |
What's Included
- HMS 12 S4-LD-G
Hertz
About the Hertz HMS 12 S4-LD-G
From our tech experts at CEN
Marine-grade 12 inch coaxial speakers handling 500w 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 12 S4-LD-G need a subwoofer box?
A: No. The HMS 12 S4-LD-G 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 12 S4-LD-G?
A: It is a 4 ohm single voice coil subwoofer rated at 500W continuous and 1000W peak power handling.
Q: Is the HMS 12 S4-LD-G sold as a single or a pair?
A: It is sold as a single subwoofer. The box contains one HMS 12 S4-LD-G.
