The Polk Audio Monitor XT15 is the most compact bookshelf loudspeaker in the Monitor XT series. Like its series siblings, the XT15 retains an entirely passive design. The speaker pair can be used as left and right speakers for stereo setups or as surround speakers in immersive or surround sound setups. So, how do these speakers sound? Listeners at Sweetwater report that they deliver high-resolution trebles paired with robust, impactful bass. That superb sound is supplied by a 5.25" Dynamic Balance woofer paired up with Polk Audio’s superb Hi-Res Audio certified Terylene tweeter. There’s also a rear-firing port to help extend the frequency response from 48Hz-40kHz. Whether you’re an audio fanatic or just dipping your toes in the hi-fi space, the Polk Audio Monitor XT15 offers show-stopping sound and serious value.