M2D4-12I

Marine Tested: Rockford Fosgate uses industry standard tests (ASTM B117 salt/fog and ASTM G154 UV) to ensure the M2 series subwoofers are durable in the difficult marine environment.

Impedance Switch: A switch on the input terminal allows you to easily change the subwoofer's impedance between 2Ω and 8Ω, internally changing between wiring the dual 4Ω voice coils in parallel and in series. (The connected amplifier should be off when changing the impedance.) The power handling is the same for either setting; 400 watts RMS/1600 watts peak.

Infinite-Baffle Operation: The sub is optimized for infinite-baffle operation (free air), so it can be installed in a variety of locations, without the need for a dedicated enclosure.

LEDs: There are red, green, and blue LEDs on the back of the grille to create a glow on the woofer cone. The LEDs can be powered individually, or in any combination you like. Depending on what combination of LED wires is connected, they light red, green, blue, yellow, pink, aqua, or white. A 12 volt power supply is needed to turn the LEDs on and a 1-amp fuse should be added in-line (fuse not included). The LEDs can also be controlled using Rockford Fosgate's LED Controller (item number 575PMXRGB, sold separately). An LED power wire harness is included with a 4-pin waterproof Deutsch DT Series connector that plugs into the subwoofer frame.

Speaker Terminals: In addition to standard male quick slide terminals, the subwoofer also has a 2-pin waterproof Deutsch terminal. A speaker wire harness with a 2-pin waterproof Deutsch DT Series connector is not included.

VAST Surround: The Vertical Attach Surround Technique (VAST) increases a speaker's effective radiating cone area without increasing the size of the basket.

Klippel Verified: The Klippel distortion analyzer, a device that uses a laser and sophisticated software to do large-scale analysis of drivers in motion, lets Rockford Fosgate optimize the speaker's motor structure, voice coil alignment, and suspension to yield the best possible performance.

Stainless Steel: The included mounting hardware is stainless steel to resist corrosion.

Enclosure/Free-Air: The sub can be mounted in a ported box or in an infinite-baffle (free-air) application. The best ported enclosure volume is 1.5 ft³ using one 3" diameter x 5¾" long port; this yields a tuning frequency of 40 Hz and a -3dB point of 37.2 Hz. Infinite-baffle mounting yields a -3dB point of 50.5 Hz.

• 12" marine subwoofer with dual 4-ohm voice coils
• design for infinite baffle (free-air) installations
• injection-molded mineral-filled polypropylene cone
• integrated Color Optix RGB LED lighting included (requires separate PMX-RGB lighting controller)
• synthetic fiber blend spider
• Element Ready™ design
  • rugged, UV-stable plastic parts
  • Deutsch™ and Amphenol™ waterproof connectors make wiring simple
  • IP67 certification
• removable grille included with interchangeable stainless-steel mesh or "Sport" inserts

• power handling: 400 watts RMS (1600 watts peak)
• frequency response: 20-750 Hz
• sensitivity: 88 dB @ 1w/1m
• switchable impedance: 2 or 8 ohms
• cutout diameter: 11"
• top-mount depth: 5.13"

USER MANUAL