Polk Audio continues its tradition of making brilliant-sounding speakers in stylishly designed packages — their Mobile Monitor (MM) Series speakers look great and sound even better. Each speaker utilizes an extra-strong, extra-small neodymium magnet that saves space and weight, allowing these speakers to fit into more places in more vehicles while still delivering a full sound with lots of kick. Their lightweight carbon composite frames provide strong, flex-free support for the speakers' motor assemblies.

The Polk MM521 5-1/4" speakers feature honeycomb-textured woven glass fiber composite woofer cones that respond very quickly for a clean, crisp, and powerful sound. Large voice coils — over an inch in diameter — give the speaker high power-handling capability and extended reliability.

1" silk dome tweeters add a sweet high end that blends perfectly with the low notes so your music stays in harmonic balance, from the electric bass all the way on up to the cymbals. Swivel mounts on the tweeters allow you to aim the high notes to produce a superior soundstage in your car.

Features

• 5-1/4" 2-way speakers (pair)
• woven honeycomb glass fiber composite woofer cone with butyl rubber surround
• 1" silk composite dome tweeter with swivel mount
• certified for marine use
• 2.7-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
• power range: 15-90 watts RMS (200 watts peak power)
• frequency response: 50-25,000 Hz
• sensitivity: 92 dB @ 2.83 V
• top-mount depth: 2-3/8"