M7 12-inch Marine Subwoofer for Infinite-Baffle Use (600 W, 4 Ω) - Gray Metallic 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 Specifications

 

Continuous Power Handling (RMS)	600 W
Nominal Impedance (Znom)	4 Ω

 

 

Physical Specifications

 

 

 

Nominal Diameter	12.00 in / 300 mm
Overall Diameter (A)	14.00 in / 356 mm
Bolt Hole Circle Diameter (B)	12.813 in / 325 mm
Frontal Grilles Protrusion* (C)	1.48 in / 38 mm
Mounting Hole Diameter (D)	12.0625 in / 306 mm
Mounting Depth (E)	7.94 in / 202 mm
Driver Displacement	0.148 cu ft / 4.19 L
Net Weight	25.35 lbs / 11.5 kg
*Frontal grille protrusion measured from mounting surface

 

 

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
* 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

 

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

 

 

• M7_12IB_OWNER_S_MANUAL.pdf