The Mackie CR4 - 4" Woofer Creative Reference Multimedia Monitors (Pair) are a compact and portable solution for providing audio playback in home and studio environments for multimedia work such as mixing music or doing sound for film. The pair consists of one passive un-powered speaker and one Class AB amplifier powered speaker that connect with an included 6' stereo cable. The monitors use 4" polypropylene-coated woofers and a rear port tube for the low end and 0.75" silk dome tweeters for the..