Δ SONY models: SS-MD77 Speaker system 3-way, bass-reflex type Speaker units: • Woofer: 17 cm dia., cone type • Tweeter: 5 cm dia., cone type • Super Tweeter: 2 cm dia., dome type • Nominal impedance 6 ohms • Dimensions (w/h/d) 21.5 × 43 × 25 Cm. Mass Approx. 5.5 kg net per speaker