M-Series 8-inch Marine Subwoofer Driver for Infinite-Baffle Use (200 W, 4 Ω) - White 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 just a large volume of air behind it (at least 1.5 cu. ft. / 42.5 l). If you prefer to use a dedicated enclosure, refer to one of the suggested designs located in the Specifications section for optimum performance.
Like all JL Audio marine speakers, this driver is built to withstand a real saltwater marine environment and deliver years of listening enjoyment
Continuous Power Handling (RMS) 200 W
Nominal Impedance (Znom) 4 Ω
Nominal Diameter 8.0 in / 200 mm
Overall Diameter (A) 8.8 in / 224 mm
Bolt Hole Circle Diameter (B) 7.97 in / 202 mm
Motor Outer Diameter (C) 5.50 in / 140 mm
Frontal Grilles Protrusion* (D) 1.45 in / 37 mm
Mounting Hole Diameter (E) 7.375 in / 187 mm
Mounting Depth (F) 5.18 in / 132 mm
Driver Displacement 0.032 cu ft / 0.91 L
Net Weight 6.82 lb / 3.094 kg
*Frontal grille protrusion measured from mounting surface
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 ft / 16.00 L
One-Way Linear Excursion (Xmax)* 0.53 in / 14 mm
Reference Efficiency (no) 0.28%
Efficiency (1 W / 1 m)** 86.7 dB SPL
Effective Piston Area (Sd) 35.15 sq in / 0.0227 sq m
DC Resistance (Re) 2.958 Ω
* 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”.
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