[8" SPEAKER DRIVER - Delivers powerful sound with highly accurate distortion-free bass to provide you with a better listening experience. LOW PASS FILTER WITH FREQUENCY RESPONSE DOWN TO 38Hz - Ensures that your woofer only plays sounds too low for your speakers to properly output. Supplement your speakers great high and mid-range with bass you can really feel. THICK MDF WOODEN ENCLOSURE - We use high quality dense fiberboard materials that offer reduced acoustic resonance for better audio quality. "AUTOMATIC STANDBY - Save on electricity with an auto standby feature that ensures the woofer is not unnecessarily using up power when its not being used." "2 YEAR WARRANTY - Edifier guarantees youll have an amazing experience with our products. Buy with confidence and enjoy our 2 year warranty."]