Acoustic Research AR18BX Speaker Pair Maintenance completed From Japan. Woofer edge replaced, enclosure scratch repair/paint. Maintenance is performed at our store. All parts work normally. AR(Acoustic Research) AR-18? 69,520 (pair, circa 1981). AR’s sealed speaker system released in the early 1980s. The company has long been known for adopting a sealed type (acoustic suspension method), and this unit also makes use of this feature. Take this opportunity to try out AR’s speakers, which are also known for being used by famous people such as Miles Davis and Karajan. Quoted from the following site. A small 2-way bookshelf speaker system. Equipped with a 20cm cone type woofer for low frequencies. Equipped with a 3.2cm ring radiator type tweeter for high frequencies. In addition, the magnetic liquid naturally guides the voice coil to the central axis of the pole piece, improving the accuracy of the unit and enabling playback with less distortion. Equipped with a two-stage tone control for high frequencies. The enclosure uses the traditional acoustic suspension method, and the air inside the completely sealed enclosure acts as a spring to support the cone, improving bass reproduction. Method 2-way, 2-speaker, acoustic suspension method, bookshelf type. Unit used Low frequency: 20 cm cone type. High frequency: 3.2 cm ring type. Frequency response 48 Hz to 25 kHz. Output sound pressure level 86 dB/W/m. Continuous maximum input 100 W. Crossover frequency 2 kHz. Capacity 9.77 L. External dimensions W 244 x H 419 x D 159 mm. Weight 6.1 kg (per unit). About other area, please ask me. International Buyers – Please Note. We do not mark merchandise values below value or mark items as “gifts” – US and International government regulations prohibit such behavior.