Hertz HMX 8-TC HMX 8" 100W RMS 4-Ohm Marine Coaxial Speakers, Total Charcoal, Pair (78040286)

The Hertz HMX 8-TC 8-inch HMX marine coaxial speakers deliver high-output, full-range sound for boats and other exposed audio installations. This pair combines UV-resistant cone and grille materials, a high-excursion woofer, and a neodymium tweeter for reliable audio coverage around the vessel. This version has no integrated RGB lighting.

Key Features

• Sold as a pair (two coaxial speakers); RMS and peak ratings refer to each speaker.
• 100W RMS and 200W peak handling per speaker, with 4-ohm nominal impedance.
• UV-inhibited polypropylene woofer cone with co-molded Santoprene rubber surround.
• Aramid-fiber spider with silicone-insulated lead wires and marine-grade polymer basket.
• 1.4-inch neodymium-magnet tweeter with PEI dome and acoustic lens to improve off-axis listening.
• Protective stainless-steel tweeter mesh and corrosion-resistant gold-plated terminals.
• Sealed crossover with resettable tweeter protection; infinite-baffle optimized construction.
• IP65 water-jet protection, UV-resistance testing (ASTM D4329) and salt-fog testing (ASTM B117).
• Tone-on-tone total charcoal grille finish.

Technical Specifications

• Speaker type: 2-way marine coaxial; pair
• Nominal model size: 8 inches
• Manufacturer physical driver designation: 224mm (8.8 in.) on classic HMX 8 technical sheet
• Continuous power handling: 100W RMS each
• Peak power: 200W each
• Nominal impedance: 4 ohms
• Frequency response: 45Hz–25kHz
• Sensitivity: 91dB SPL
• Woofer voice-coil diameter: 32mm (1.26 in.)
• Tweeter diaphragm: 36mm (1.4 in.)
• Tweeter voice-coil diameter: 20mm (0.8 in.)
• Woofer motor: high-density ferrite magnet, 90 x 40 x 20mm
• Tweeter motor: neodymium, 19.7 x 3mm
• Woofer cone: polypropylene with UV inhibitors
• Tweeter dome: PEI
• Mechanical excursion limit (Xmech): ±8.5mm
• Effective diaphragm diameter (D): 174mm
• DC resistance (Re): 3.1 ohms
• Resonance (Fs): 50Hz
• Voice-coil inductance (Le): 0.52mH
• Equivalent volume (Vas): 29.46L
• Moving mass (Mms): 27.3g
• Compliance (Cms): 0.37mm/N
• Force factor (BL): 6.6T·m
• Total Q (Qts): 0.58
• Electrical Q (Qes): 0.61
• Mechanical Q (Qms): 11
• Front overall diameter: 225mm (8.86 in.)
• Baffle cutout: 180mm (7.09 in.)
• Mounting depth: 123mm (4.84 in.)
• Net weight: 1.66kg (3.66 lb) per speaker
• Environmental protection: IP65
• Finish: Total Charcoal
• Lighting: None

Compatibility

• Designed for marine audio systems with 4-ohm-compatible amplifier channels and infinite-baffle speaker mounting.

Installation Considerations

• Install both speakers in sufficiently rigid baffles with recommended cutout and rear mounting clearance.
• Connect each 4-ohm driver to a suitable amplifier output; use appropriate high-pass filtering for the chosen acoustic installation.
• Seal panel penetrations and protect terminal connections from accumulated water and corrosion.