About the Polk Audio MM840
Polk Audio's Mobile Monitor Series subwoofers bring out superior performance from lighter materials, so you'll get the impact you want without the extra weight of a conventional system. Advanced engineering and optimized components reproduce your sound with uncompromising accuracy, for low end that is rich and clear.
The MM840 8" 4-ohm subwoofer handles up to 250 watts RMS. A copper voice coil and neodymium magnet motor drive the polymer cone with exceptional efficiency. The carbon composite basket features a "wagon wheel" design that resists flexing during heavy excursion, so your sub hits solidly without distorting.
This sub is certified for marine use, and Polk includes corrosion-resistant stainless steel mounting hardware.
Priced per speaker
- 8" 4-ohm subwoofer
- polymer cone with butyl rubber surround
- carbon composite basket
- certified for marine use
- optional matching grille complements the basket design
- power range: 100-250 watts RMS
- peak power handling: 500 watts
- frequency response: 26-200 Hz
- sensitivity: 89 dB
- top-mount depth: 3-15/16"
- sealed box volume: 0.35 cubic feet
- warranty: 1 year
- Our 60-day money-back guarantee
- MFR # AA3084-A
What's in the box:
- One 8" subwoofer
- 1 Foam gasket
- Eight 1-1/2" Allen head self-tapping screws
- 8 Speed clips
- Owner's Manual (English/ French/ Spanish/ German/ Italian/ Portuguese)
- Online registration sheet
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More details on the Polk Audio MM840
Features & specs
|Surround Material||Butyl rubber|
|Ideal Sealed Box Volume (cubic feet)||0.35|
|Ideal Ported Box Volume (cubic feet)||N/A|
|Port diameter (inches)||N/A|
|Port length (inches)||N/A|
|Dual Voice Coil||No|
89 dB at 2.83 volts |
|Frequency Response||26 - 200 Hz|
|Max RMS Power Handling||250|
|Peak Power Handling (Watts)||500|
|Top Mount Depth (inches)||3 15/16|
|Bottom Mount Depth (inches)||4 11/16|
|Cutout Diameter or Length (inches)||7 1/8|
|Parts Warranty||1 Year|
|Labor Warranty||1 Year|
Basket: The MM Series subwoofers use high-tech carbon composite basket structures for light weight and maximum rigidity. They will not rust or flex like stamped steel designs.
Materials: The new polymer woofer cone and butyl rubber surround will not break down over time and will survive the rigors of harsh automotive environments.
Voice Coil: The high temperature, 1-1/2" diameter copper voice coil and polyamide former withstand the most rigorous use while maintaining extremely low distortion.
Terminals: The woofer has heavy duty spring terminals that will accept single banana plugs, pin connectors, and bare wire up to 8 gauge.
Marine Certified: Polk MM Series speakers are built to withstand exposure to moisture and UV rays, so they work well in boats and cars.
Klippel Measurement Technology: State-of-the-art laser based Klippel measurement technology is used to optimize the woofer's motor structure, voice coil alignment, and suspension to improve performance, even at extreme listening levels.
Sealed Box Volume: Polk recommends using this woofer in a sealed enclosure; the ideal internal volume is 0.35 cubic feet.
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