frequency response: 45-40,000 Hz (-6dB) recommended amplifier power: 125 watts sensitivity: 86 dB impedance: 6 ohms 1" compression driver with neodymium magnet and one-piece Teonex diaphragm on a glass-filled ABS Bi-Radial horn 5-1/4" PolyPlas cast aluminum frame woofer with symmetrical field geometry (SFG) magnet structure and rubber surround bass-reflex (ported) design black finish dual gold-plated speaker binding posts (bi-wire capable) port tube inserts included for attenuating bass in the 50-100Hz region to compensate for room placement 8-7/16"W x 18-3/8"H x 8-3/4"D