SKU 1154
8-inch single voice coil subwoofer

Designed to Perform

The MM840 high performance 8-inch subwoofer maybe compact for a subwoofer but it cranks out waves of bass. As a result of 3 years of Polk research and development, every woofer and driver in the MM Series has been designed to offer unparalleled sound quality with exceptional fit to meet virtually any application. Borrowing technology from our flagship SR Series, the MM Series offers outstanding performance for your mobile audio dollar. With 250 Watts continuous/500 Watts peak power handling, the MM840 is recommended for small sealed (.35 cubic foot) enclosures.

MM840 Features:

  • New polymer woofer cones and butyl rubber surrounds will not break down over time and will survive the rigors of harsh automotive environments.

  • High temperature copper voice coil (51mm) and polyamide former withstands the most rigorous use while maintaining extremely low distortion for bass punch and output.

  • Heavy duty input terminals accommodate speaker wire up to 8 AWG or twisted pairs of 12 AWG.

  • Advanced carbon composite basket based on the spokes of a wheel is lightweight, will not flex during peaks and looks great! Don't be afraid to show off the back of your woofer.

  • Klippel optimized components using a state-of-the-art Klippel distortion analyzer, Polk engineers were able to optimize the woofer's motor structure, voice coil alignment and suspension for the best possible performance, even at extreme listening levels.

  • Available matching grille complement the wheel spoke design.

  • Dual voice coil configuration (MM840DVC) also available.

Dimensions - Cut-Out Diameter 7 1/8 (18.10cm) "
Dimensions Driver Mounting Depth - Bottom Mount 4 11/16 (11.91cm) "
Dimensions Driver Mounting Depth - Top Mount 4 1/8 (10.48cm) "
Driver Complement Subwoofer - Diameter 8 (20.32cm) "
Driver Complement Subwoofer - Quantity 1
Driver Complement Subwoofer - Type Dynamic Balance poly composite woofer
Electrical - Efficiency 90 dB
Electrical - Minimum Impedance 3.3
Electrical - Nominal Impedance 4 ohms
Electrical - Total Frequency Response 26-200Hz
Electrical Power Handling - Continuous 250 watts
Electrical Power Handling - Peak 500 watts
Electrical Voice Coil - Driver Diameter 1 1/2 (3.81cm) "
Shipping - Unit of Measure each
Thiele / Small Parameters - LE 2.3 mH
Thiele / Small Parameters - QES 0.7
Thiele / Small Parameters - QMS 5.5
Thiele / Small Parameters - QTS 0.6
Thiele / Small Parameters - Resonant Frequency 35 Hz
Thiele / Small Parameters - SD 35.65 sq in/230 sq cm
Thiele / Small Parameters - VAS .54 cu ft/15.4L
Thiele / Small Parameters Xmax - Xmax Linear 0.75
Warranty - Speaker Warranty 1 year parts and labor (original purchaser)