Very Good Condition Mirage 350 Bookshelf Speakers Re-foamed by previous owner approx. 5 years ago. Specs: -Woofer: Nominal 8" Diameter designed by Mirage -Tweeter: 1" Diameter Mirage Soft-Dome Tweeter -Sensitivity: 92 dB - Crossover Frequency: 4 kHz - Recommended Minimum amplifier power: 10 watts, Maximum: 100 watts - Nominal Impedance: 4 ohms - Dimension: 18" x 11.375" x 8.25"