Hertz HMS 10 B4-LD-C 10" 300W RMS 4-Ohm Infinite-Baffle Marine Subwoofer with RGB LED Lighting, Black (78035461)

The Hertz HMS 10 B4-LD-C is a 10-inch long-throw marine subwoofer engineered for infinite-baffle mounting in a well-separated boat bulkhead. Its UV-inhibited polypropylene cone, Santoprene surround and aramid-fiber spider resist marine exposure, while the RGB LED illumination brings accent lighting to the black grille design. The 4-ohm single-voice-coil variant lets installers choose a load appropriate to the amplifier.

Key Features

• 300W RMS continuous / 600W peak power handling
• Single 4-ohm voice coil, 50mm / 2-inch diameter
• Long-throw assembly designed for infinite-baffle mounting
• Integrated RGB LED lighting, compatible controller separately required
• IP65 marine-weather-rated construction; UV and salt-fog tested
• Marine-grade polymer basket, UV-inhibited polypropylene cone and co-molded Santoprene surround
• Aramid-fiber spider and silicone-insulated lead wires
• Gold-plated brass terminals with silicone protective caps
• High-density ferrite magnetic circuit

Technical Specifications

• Nominal size: 250mm / 10 in.
• Power handling: 300W RMS continuous, 600W peak
• Nominal impedance: 4 ohms
• Voice coil: 50mm / 2 in., single
• Magnet dimensions: 140 x 60 x 30mm
• Sensitivity: 88dB
• DC resistance (Re): 4.5 ohms
• Free-air resonance (Fs): 41Hz
• Voice-coil inductance (Le): 0.9mH
• Equivalent volume (Vas): 37L
• Moving mass (Mms): 69g
• Suspension compliance (Cms): 0.22mm/N
• Motor strength (BL): 10.2 T·m
• Mechanical Q (Qms): 11
• Electrical Q (Qes): 0.76
• Total Q (Qts): 0.71
• Linear excursion (Xmax): 13.5mm
• Outer diameter: 280mm / 11.02 in.
• Mounting dimension B: 227mm / 8.94 in.
• Overall depth: 164mm / 6.46 in.
• Mounting depth: 116mm / 4.57 in.
• Mounting flange dimension F: 48mm
• Suggested sealed-box compact volume: 50L / 1.77 cu. ft.
• Suggested sealed-box performance volume: 71L / 2.51 cu. ft.
• Suggested sealed-enclosure panel cutout: 230mm / 9.06 in.
• Water-resistance class: IP65

Compatibility

• Amplifier must support 4-ohm subwoofer loads
• RGB lighting requires compatible conventional RGB control, such as Hertz HM RGB 1 BK

Installation Notes

• Seal the front/rear air spaces for infinite-baffle operation; avoid a shared air path between cone sides
• Set low-pass filter and amplifier gain to prevent over-excursion
• If using a sealed box, refer to 50L and 71L manufacturer enclosure examples