$139.99 (as of November 30, 2017, 5:33 pm)

Last updated on January 18, 2018 9:53 pm


Quick Review:

The Polk Audio MM840 is an incredibly well performing 8″ subwoofer, on a lightweight frame. It will provide the punch you need but without the heaviness and extra weight of a conventional sub. The MM840 can easily handle up to 250 watts RMS and 500 watts Peak and is made with a neodymium magnet, copper voice coil, polymer cone and butyl rubber surrounding. Also, consistent with many other Polk Audio speakers, the Polk Audio MM840 is certified for marine use and made with marine grade materials so you can put this sub in your car, or boat.

Polk Audio MM840 Features:

Subwoofer Specs

  • Subwoofer Size 8″
  • Peak Power Handling: 500 watts
  • RMS Power Handling: 250 watts
  • Voice Coil: Single
  • Impedance (Per Voice Coil): 4 ohms
  • Frequency Response: 26 – 200 Hz
  • Sensitivity: 90 dB
  • Xmax: 20 mm
  • Woofer Composition: Polymer
  • Woofer Surround: Butyl Rubber
  • Main Cone Color: Black
  • Subwoofer Grille: None
  • Re-Cone Kit: None

Enclosure Recommendations

  • Enclosure Type: Ported / Vented or Sealed
  • Top-Mount Depth: 4″
  • Cutout Diameter: 7-1/16″
  • Shallow Mount: No

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