Hertz HMS 12 S4-LD-SW 12" 500W RMS 4-Ohm Marine Subwoofer with RGB LED Lighting & Sport Silver-White Grille (78035449)

The Hertz HMS 12 S4-LD-SW is a 12-inch marine subwoofer designed for powerful low-frequency reproduction in the open-air environment of a boat. Its single 4-ohm voice coil is rated at 500W RMS continuous and 1000W peak, while the sport silver-white grille and integrated multicolor LED lighting provide a coordinated onboard appearance. The large-excursion motor and suspension design is optimized for infinite-baffle use, although enclosure choices should always be matched to vessel construction and published parameters.

Key Features

• Long-excursion marine subwoofer designed to reinforce bass and relieve main coaxial speakers of the deepest frequency content
• 500W RMS continuous handling, with 1000W maximum capacity
• Single-voice-coil impedance chosen to match a compatible amplifier channel
• Integrated RGB lighting is wired separately from the acoustic driver circuit
• Sport Silver-White grille styling for marine installations
• UV-stabilized polymer cone and corrosion-resistant construction

Technical Specifications

• Nominal diameter: 12 in. (300mm)
• Continuous power handling: 500W RMS
• Peak power handling: 1000W
• Nominal impedance: 4 ohms; single voice coil
• Application: marine infinite-baffle / baffle mounted subwoofer
• Grille: Sport removable/paintable grille, Sport Silver-White
• Integrated RGB LED illumination: yes
• Cone: UV-inhibited polypropylene
• Surround: marine-grade elastomer / Santoprene
• Magnet: high-density flux ferrite
• Environmental protection: IP65 water-jet-rated marine design
• Marine environmental testing: UV, salt fog, vibration and spray
• Voice coil diameter: 65.5mm (2.6 in.)
• Published continuous output: 500W RMS
• Frequency response: 20–700Hz (manufacturer 12-inch HMS family)
• Sensitivity: approximately 89.5dB (manufacturer 12-inch HMS family)
• Outside grille diameter: approximately 342.9mm (13.5 in.)
• Cutout: approximately 279.4mm (11 in.)
• Mounting depth: approximately 140.6mm (5.54 in.)
• Free-air resonance: approximately 30Hz (12-inch HMS family)
• Driver material: corrosion-resistant polymer frame

Compatibility

• Compatible with amplifier subwoofer outputs rated for a 4-ohm speaker load
• RGB lighting may be integrated with compatible analog RGB control equipment, including Hertz HM RGB 1 BK

Installation Guidance

• Use a dedicated subwoofer amplifier capable of safely driving 4 ohms
• Provide an adequate mounting baffle, gasketed/sealed fasteners and rear-panel clearance; use the exact current Hertz cutout drawing
• An infinite-baffle application requires an appropriate separation between front and rear sound waves and a suitable sealed/isolated bulkhead
• Configure low-pass and any infrasonic filtering to the vessel and enclosure characteristics
• Use a compatible 12V RGB lighting controller for adjustable multicolor lighting; do not connect LED leads to speaker-level audio