Hertz HMS 10 B4-LD-W 10" 300W RMS 4-Ohm Infinite-Baffle Marine Subwoofer with RGB LED Lighting, White (78035431)

The Hertz HMS 10 B4-LD-W is a 10-inch white marine subwoofer engineered for infinite-baffle installations in boats and other open-air audio systems. Its single 4-ohm voice coil handles 300W RMS continuously (600W peak), providing focused low-frequency performance when driven by a compatible subwoofer amplifier. The LD-series design incorporates LED accent lighting, a high-excursion cone assembly, UV-resistant materials, and marine-oriented protection against salt fog, vibration, moisture, and thermal cycling.

Key Features

• 10-inch marine infinite-baffle subwoofer with white front styling
• 300W RMS continuous / 600W peak handling; rating applies to one subwoofer
• Single 4-ohm voice coil for compatible mono or bridged amplifier outputs
• 50mm (2-inch) copper voice coil, high-flux ferrite motor, and FEM-optimized mobile assembly
• Polypropylene cone with UV inhibitors and co-molded Santoprene surround
• Aramid-fiber spider and silicone-insulated lead wires improve durability under sustained excursion
• Marine polymer basket and gold-plated, corrosion-resistant brass speaker terminals with silicone protection
• IP65-rated marine construction, with UV and salt-fog resistance
• LED lighting connection is independent of speaker power and requires appropriate supply/control
• Designed for infinite-baffle installation; optional compact and performance sealed enclosure recommendations are published by Hertz

Technical Specifications

• Driver diameter: 250mm (10 in.)
• Continuous power handling: 300W RMS
• Peak power handling: 600W
• Nominal impedance: 4 ohms
• Voice-coil configuration: Single voice coil
• Voice-coil diameter: 50mm (2 in.)
• Voice-coil wire: Copper
• Sensitivity: 88dB
• Magnet: High-density flux ferrite
• Magnet dimensions: 140 x 60 x 30mm
• Cone: UV-inhibited polypropylene
• Surround: Santoprene
• Maximum mechanical excursion (Xmech): ±19mm
• Published linear excursion (Xmax): 15mm
• Mounting outside diameter: 280mm (11.02 in.)
• Dimension B: 227mm (8.94 in.)
• Dimension C: 165mm (6.50 in.)
• Mounting depth: 116mm (4.57 in.)
• Mounting cutout diameter for suggested boxes: 230mm (9.06 in.)
• Ingress protection: IP65
• Weight: Approx. 5.1kg (11.24lb)
• Manufacturer compact sealed volume: 50L (1.77 cu ft.)
• Manufacturer performance sealed volume: 71L (2.51 cu ft.)
• Finish: White

Compatibility

• Compatible with marine subwoofer amplifiers supporting a 4-ohm load and appropriate RMS output
• Infinite-baffle applications require a suitable rigid installation baffle that separates front and rear acoustic radiation
• For optional enclosed installations, use manufacturer box design recommendations
• LED illumination must be connected to compatible lighting power and control circuits

Installation Notes

• Allow at least 116mm (4.57 in.) of mounting depth plus wiring clearance
• Cut the baffle using the exact mounting template and support the mass of the subwoofer
• Use marine-grade terminations and seal speaker connections and panel penetrations
• Adjust low-pass crossover, gain, and subsonic protection to match the installation and prevent over-excursion
• Keep the front and rear air volumes isolated in infinite-baffle installations