
Review Summary
Driver Complement Subwoofer: Dynamic Balance poly composite woofer
90 dB
Dual 4Ohms
26-200Hz
250 watts
500 watts
1.50" / 3.81cm
Driver Complement Subwoofer: 1
LE: 2.47 mH
QES: 0.62
QMS: 5.5
QTS: 0.59
SD: 35.65 sq in/230 sq cm
VAS: .55 cu ft/15.8 L
Thiele/Small Parameters: 43Hz
Thiele/Small Parameters: 0.75
7.12" / 18.08cm
Bottom Mount: 4.68" / 11.89cm
Top Mount: 4.12" / 10.46cm
Driver Complement Subwoofer: 8" / 20.32cm
Introducing the new MM840 high performance 8-inch subwoofer. Great for big bass without taking up much space. As a result of 3 years of Polk research and development, the new MM systems have been designed to offer unparalleled sound quality with exceptional fit to meet virtually any application. Borrowing technology from Polk Audio's flagship SR Series, the MM Series offers exceptional value for the price.
Through the use of high-tech carbon composite baskets, powerful neodymium motor structures using oversized voice coils and state-of-the-art woven glass composite cones, they offer high-end audio performance normally found only in the most expensive loudspeaker systems.