JL AUDIO 12 Inch Marine Subwoofer Driver ,Titanium Sport Grille - M7-12IB-S-GmTi-4

M7 12-inch Marine Subwoofer for Infinite-Baffle Use (600 W, 4 Ω) - Gunmetal Trim Ring, Titanium Sport Grille

Engineered as the reference standard for marine subwoofer performance, the M7-12IB is capable of producing staggering amounts of jaw-dropping bass in infinite-baffle applications.

Built to withstand real-world marine duty, this M7-12IB is designed to operate without a dedicated enclosure. It boasts a monstrous 4-inch voice coil and rugged suspension system to deliver outstanding linear excursion for high output and power handling.

M7-12IB is best used with amplifier power in the 200W – 600W range and is optimized to operate with a large volume of air behind it (at least 3 cu. ft. / 84.95 l).

Like all JL Audio marine speakers, this driver is built to withstand a real saltwater marine environment and deliver years of listening enjoyment.

General Specification

• Nominal Impedance (Znom):4 Ω

Parameters

• Free Air Resonance (Fs) :35.34 Hz
• Electrical “Q” (Qes) :0.856
• Mechanical “Q” (Qms) :10.389
• Total Speaker “Q” (Qts)  :0.791
• Equivalent Compliance (Vas) : 1.99 cu ft / 56.35 L
• One-Way Linear Excursion (Xmax)* :0.73 in / 18.5 mm
• Reference Efficiency (no) : 0.28%
• Efficiency (1 W / 1 m)** :86.7 dB SPL
• Effective Piston Area (Sd)  :80.54 sq in / 0.052 sq m
• DC Resistance (Re)  :3.543 Ω

Enclosure Specifications

• Infinite Baffle Use  :Yes (preferred)
• Min. Sealed Enclosure Volume   :2.0 cu ft / 56.6 L (or larger)
• Optimum Sealed Enclosure Volume   :3.0 cu ft / 70.8 L

Technology

Marine Materials / Testing

Summary:

The design of marine products requires extensive materials testing to achieve reliability and longevity.

Detailed Information:

Building serious marine products requires a real commitment to environmental testing and materials specification. To this end, JL Audio has invested in Ultraviolet testing chambers (to simulate years of sun exposure) and Salt Fog chambers (to simulate years of exposure to salt-water environments). This testing is critical to building products that will not only sound great in your boat, but will also sound great for many, many years.

Materials Used:

• injection-molded mica-filled polypropylene cone bodies with synthetic rubber surrounds, specifically formulated with UV inhibitors for marine duty.
• Marine-grade, synthetic fiber spiders with progressive roll designs to withstand high humidity.
• Specifically engineered polymer baskets are corrosion and UV-resistant and encapsulate the woofer's motor system to prevent corrosion.
• Gold-plated, marine-grade brass connection terminals
• Marine-grade stainless steel mounting hardware is included.