JBL PB10 10" 150-Watt Down-Firing Powered Subwoofer (Discontinued by Manufacturer) High-efficiency, high-output powered subwoofer delivers thunderous, penetrating bass 10-inch pure cellulose fiber cone reproduces low frequencies with extreme accuracy and minimal distortion LFE input bypasses the subwoofer's low-pass crossover network to avoid unnecessary low-frequency reprocessing 150-watt amp power Floor firing, ported