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Engineered as the reference standard for marine subwoofer performance, the M12IB6 is capable of producing staggering amounts of jaw-dropping bass in infinite-baffle applications. Built to withstand real-world marine duty, this M12IB6 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. The M12IB6 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.


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Continuous power handling (RMS) 600 W
Nominal impedance (Znom) 4 Ω
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” / 18.5 mm
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

 * 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”.

Enclosure Specifications
Minimum sealed enclosure volume 2.0 cu ft / 56.6 L (or larger)
Optimum sealed enclosure volume 3.0 cu ft / 70.8 L
Infinite baffle use Yes


Nominal diameter 12” / 300 mm
Overall diameter (A) 14” / 356 mm
Mounting hole diameter (B) 12.0625” / 306 mm
Bolt hole circle (C) 12.813” / 325 mm
Motor overmold outer diameter (D) 8.84” / 225 mm
Mounting depth (E) 8.05” / 204 mm
Driver displacement 0.153 cu ft / 4.33 L
Net weight 23.8 lb / 10.8 kg


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