Hertz 78040327 HMX 7.7 S-LD-G Marine Speaker

Hertz 78040327 HMX 7.7 S-LD-G 7.7" 4-Ohm Marine Sports Coaxial RGB LED Speaker Set

The Hertz 78040327 (Model: HMX 7.7 S-LD-G) is a high-output 7.7-inch (196 mm) 2-way 4-Ω marine coaxial speaker system engineered for open-water audio clarity and visual customizability. Optimized specifically for infinite-baffle (free-air) installations, the HMX 7.7 delivers deep bass response and wide high-frequency projection without requiring sealed enclosures, making it ideal for installation in gunwales, bow seating, or cockpit side panels.

Constructed to meet Hertz Pure Marine standards, the system features a UV-resistant polypropylene cone, a co-molded Santoprene surround, and an aramid-fiber spider with silicone-insulated lead wires to prevent corrosion in marine environments. High frequencies are handled by a 1.4-inch (36 mm) PEI dome tweeter fitted with an acoustic lens for wide off-axis dispersion across open decks. This variant includes integrated diffused RGB LED illumination situated behind a metallic grey ASA plastic sports grille.

Key Features

• Infinite-Baffle Acoustic Tuning: Long-throw 32 mm (1.26'') voice coil woofer fine-tuned to deliver punchy low-frequency dynamics without a dedicated enclosure.

• Integrated Diffused RGB Lighting: Built-in LEDs under the tweeter assembly diffuse light evenly across the cone area.

• Off-Axis Acoustic Lens Tweeter: 36 mm PEI dome tweeter utilizes a high-efficiency neodymium magnet and acoustic faceplate to project clear highs throughout open deck spaces.

• Hertz Pure Marine Certification: Rated IP65 water-jet resistant, salt-fog tested (ASTM-B117), and UV protected (ASTM-D4329).

• Sealed Internal Crossover: Built-in crossover network includes a resettable solid-state tweeter protection circuit.

Specifications