These sold new for The Electro-Voice (EV) Sentry 505 is a vintage, passive time-coherent studio monitor introduced in the 1980s. It features a robust 12-inch woofer and a Super-Dome tweeter housed in a heavy floorstanding cabinet, engineered for high efficiency and accurate broadcast or recording studio monitoring.Key SpecificationsFrequency Response: 40 to 18,000 Hz (±3 dB)Power Handling: 100W long-term, 400W short-term peakSensitivity / Efficiency: 96 dB SPL (1W/1m)Nominal Impedance: 8.0 ohms (6.0 ohms minimum)Crossover Frequency: 1,500 Hz (12 dB/octave)Weight: ~60 lbs (27 kg)