5-1/4" aluminum wooferAlong with 1" aluminum tweeter for a complete range of sounds.2-way speaker systemSounds like 1 source rather than several separate sources.Removable black grilleRemains acoustically transparent while protecting the speaker's components (sold separately).Bass reflex enclosureWith a rear-firing port promotes optimal performance.51Hz - 28kHz frequency responseEnsures a wide range of accurately reproduced sound.86dB sensitivityEnsures crisp, robust audio.8 ohms nominal impedanceEnsures efficient conduction of power through the speaker.