JL Audio M6 Marine Subwoofer 8" with Black Luxe Grille (M6-8IB-L-SbSb-4)

M6 Series 8" Marine Subwoofer with Black Luxe Grille (M6-8IB-L-SbSb-4) (010-03868-00)

The JL Audio M6 Series 8" marine subwoofer embodies JL Audio's dedication to superior audio performance, innovative design, and top-notch craftsmanship. This durable driver delivers powerful bass, supported by a substantial magnet and robust components capable of managing up to 200 watts RMS.

Built for resilience, it includes a fully sealed, waterproof front along with a black grille and trim ring that can be customized with paint for a personalized appearance.

• Designed for marine audio enthusiasts, the JL Audio (M68IBLSbSb4) 8″ subwoofer delivers deep and smooth bass that frees your smaller main speakers from reproducing low frequencies — letting your entire sound system play louder, cleaner and with better fidelity. 
• The “Luxe” model features a low-profile mounting bezel and a fine mesh Black Luxe grille, minimizing protrusion into your cabin or deck area for a sleek, upscale visual impact that complements premium marine environments.
• Engineered for infinite-baffle (free-air) installation, this subwoofer is optimized for at least 1.5 cu ft (42.5 L) of air space behind it, eliminating the need for a dedicated enclosure — giving you more flexibility for installation in boat hulls or bonded bulkheads. 
• Built with a DMA-optimized long-excursion design and rugged suspension system, it’s capable of delivering high output with precision, leveraging the same advanced motor, cone and suspension modelling technology found across the M6 series. 
• Designed to handle 200 W RMS (continuous power handling) at a nominal impedance of 4 Ω, making it a reliable partner for high-quality marine amplifiers while maintaining robust performance under demanding conditions. 
• Craft-built in the USA at the fully certified factory in Miramar, Florida, using premium global materials; the construction is marine-grade with corrosion resistance, UV stability, and long-term durability even in salt-spray environments. 
• For users who prefer or require boxed installations, the sub supports sealed or ported enclosure designs as specified:
  • Sealed: Net internal volume ~2.00 cu ft (56.6 L) – external dimensions 16″ W x 16″ H x 18.25″ D (using 0.75″ wall)
  • Ported: Net internal volume ~1.50 cu ft (42.5 L), port diameter 4″ (ID) and length 13.50″ (343 mm) at tuning frequency ~37 Hz. Specifications from manufacturer. 
• Installation-friendly: with a mounting depth of 6.30″ (160 mm), and nominal overall diameter of 10.25″ (260 mm), this subwoofer fits many common marine bulkhead or enclosure mounts while preserving space. 
• High-quality finish: the Black Luxe grille is paint-ready if you wish to match your boat’s interior or deck finish, giving both premium audio performance and refined aesthetics. 

Why Choose It & Setup Tips

• If you’re upgrading a boat sound system and want clean, impactful bass without sacrificing space, this model is ideal thanks to its infinite-baffle capability and minimal protrusion design.
• Match with a high-quality marine amplifier delivering 50 W to 200 W RMS into 4 Ω for optimal results; this ensures the subwoofer performs within its ideal operating window. 
• For best audio results:
  • Use a high-quality satellite speaker system (mid/high speakers) so the subwoofer handles the low-end and the rest handle mids and highs.
  • Avoid passive crossovers (coils) on the low end, as manufacturer notes indicate these can adversely affect performance. 
  • If installing in an enclosure: ensure it’s rigid, properly sealed, and built with wall thickness no less than 0.625″ (16 mm); thinner material may compromise rigidity and bass performance. 
• Thanks to its marine-grade build (UV-resistant grille, corrosion-resistant basket, durable surround), it’s ready for harsh saltwater and offshore environments — perfect for boats, yachts, wake-boats and high-performance marine audio applications.

Also available in 10 inch

Also available in:

• Titanium Sport Grille non-LED
• Titanium Sport Grille with LED Lighting
• White Classic Grille non-LED
• White Luxe Grille non-LED
• White Sport Grille non-LED
• White Sport Grille with LED Lighting

Compatible Products:

• JL Audio® M6 Marine Speakers
• JL Audio VeX™ Enclosed Speaker System
• JL Audio® MVi Marine Amplifier

Specifications:

• QTY: Single
• Watts RMS: 200w
• Size: 8"

M68IBLSbSb4 (0100386800)
Owner's Manual (pdf)

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.