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JL Audio

JL Audio Black 8" Marine Subwoofer Driver With Titanium Grilles - 91371

Abt Model: M8IB5CGTB | UPC Code: 699440913713
JL Audio - 91371 - Marine Subwoofers
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Retail Price $239.99
Sale Price $209.99  
Allows Your Smaller Main Speakers To Be Free Of The Burden Of Reproducing Low Frequencies/ Allows Your Whole System To Play Louder And To Sound Cleaner/ Built For Real Marine Duty/ Infinite-Baffle Woofers Are Designed To Operate Without A Dedicated Enclosure/ Best Used With Amplifier Power In The 50W - 200W Range/ Black And Titanium Finish
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Your Shipping Zip Code: 20147 (change)

Estimated Delivery Date: 
Dec 3rd - Dec 4th *

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Product Details

JL Audio Black 8" Marine Subwoofer Driver With Titanium Grilles, Model M8IB5CGTB

M-Series 8-inch Marine Subwoofer Driver for Infinite-Baffle Use (200 W, 4 O) - Titanium Classic Grille

With appropriate system setup, the addition of a subwoofer allows your smaller main speakers to be free of the burden of reproducing low frequencies. This allows your whole system to play louder and to sound cleaner at all listening levels.

Purpose-engineered and built for real marine duty, the M-Series infinite-baffle woofers are designed to operate without a dedicated enclosure. Long excursion capability and rugged suspension systems help produce deep, powerful bass response that will transform your boat's audio system.

The M8IB5 is best used with amplifier power in the 50W - 200W range and is optimized to operate with a large volume of air behind it (at least 1.5 cu. ft. / 42.5 l). If you need a subwoofer driver that operates in a smaller sealed enclosure, select our M10W5, instead.

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


  • Dynamic Motor Analysis - DMA Optimized Motor
    JL Audio's proprietary Dynamic Motor Analysis system is a powerful suite of FEA-based modeling systems, first developed by JL Audio in 1997 and refined over the years to scientifically address the issue of speaker motor linearity. This leads to vastly reduced distortion and faithfully reproduced transients... or put simply: tight, clean, articulate bass.
  • Marine Materials / Testing Summary
    The design of marine products requires extensive materials testing to achieve reliability and longevity.
  • Precision Built in U.S.A. Summary
    JL Audio's Miramar, Florida loudspeaker production facility is one of the most advanced in the world.
  • Material 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.



  • Continuous Power Handling (RMS): 200 W
  • Nominal Impedance (Znom): 4

Physical Specifications

  • Driver Displacement: 0.032 cu ft


  • Free Air Resonance (Fs): 53.37 Hz
  • Electrical Q (Qes): 0.833
  • Mechanical Q (Qms): 11.827
  • Total Speaker Q (Qts): 0.778
  • Equivalent Compliance (Vas): 0.57 cu f
  • One-Way Linear Excursion (Xmax)* : 0.53 in
  • Reference Efficiency (no): 0.28%
  • Efficiency (1 W / 1 m)** : 86.7 dB SPL
  • Effective Piston Area (Sd): 35.15 sq in
  • DC Resistance (Re): 2.958
  • Notes:
    • * Xmax specifications are derived via one-way voice coil overhang method with no correction factors applied.
    • ** Efficiency (1 W / 1 m) is not an accurate indicator of a subwoofer’s output capability and should not be used as a comparison to other subwoofers to determine which one is “louder”.

Sealed Enclosure Specifications

  • Wall Thickness: 0.75"
  • Front Baffle Thickness: 0.75"
  • Volume (net int.): 1.50 cu ft
  • External Width (W): 16"
  • External Height (H): 14"
  • External Depth (D): 16.125"
  • F3: 51.53 Hz
  • Fc: 62.62 Hz
  • Qtc: 0.9128

Ported Enclosure Specifications

  • Wall Thickness: 0.75 in"
  • Front Baffle Thickness: 0.75 in"
  • Volume (net int.): 1.50 cu ft
  • External Width (W): 16 in"
  • External Height (H): 14 in"
  • External Depth (D): 17.125 in"
  • Internal Port Diameter (ID): 4 in"
  • Port Length (L): 12 in"
  • Tune to: 39 Hz
  • F3: 29.53 Hz

Approximate Dimensions:

  • Nominal Diameter: 8"
  • Overall Diameter: 8.8"
  • Mounting Hole Diameter: 7.37"
  • Bolt Hole Circle: 7.97"
  • Motor Overmold Outer Diameter: 5.5"
  • Mounting Depth: 5.18"

Approximate Weight:

  • Unit: 6.82 lbs
  • Shipping: 10 lbs

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 2 Years Parts and Labor
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More reasons to buy the JL Audio 91371 from Abt Electronics
  • is an authorized dealer (Learn More).
  • The JL Audio 91371 is Brand New.
  • The JL Audio 91371 Ships in a Factory Sealed Box.
  • Abt ships this product for free!
JL Audio Black 8" Marine Subwoofer Driver With Titanium Grilles

JL Audio Black 8" Marine Subwoofer Driver With Titanium Grilles

In Stock

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