Altec 890C BOLERO HI FI SPEAKER SYSTEMS are a bookshelf system designed to fill even the largest rooms with full natural sound. They feature the high-compliance woofer with a large voice coil and massive magnet structure for highest efficiency and clean lows. An Altec free-suspension phase inverter augments the speaker wave forms for effortless low-end reproduction. Above 2000 Hz, a new extended-response compression driver coupled to a cast aluminum horn spreads silky highs throughout any room. A three-position shelving control adjusts the high frequencies to accommodate your room acoustics.