Acoustic Research AR18BX Set Of 2. Enclosure scratches repaired and repainted. All parts function normally. AR (Acoustic Research) AR-18 ¥69,520 (pair, circa 1981). This is a sealed-type speaker system released by AR in the early 1980s. The company is known for its long-standing use of sealed-type (acoustic suspension) designs. And this model also incorporates that characteristic. AR speakers are also known for being favored by renowned figures such as Miles Davis and Karajan. Please take this opportunity to try them out. System: 2-way, 2-speaker, acoustic suspension system, bookshelf type. Drivers: Low-frequency: 20cm cone type. High-frequency: 3.2cm ring type. System Q: 1.0. Sound pressure level: 86dB/W/m. Continuous maximum input: 100W. Dimensions: Width 244 x Height 419 x Depth 159 mm. Weight: 6.1kg (per unit). International Buyers – Please Note.