Very rare ACOUSTIC REASERCH AR-3a improved, made in U.S.A. 1971, first series! This is a pair of very prestigious vintage speakers, 3-way with a 25 cm woofer External dimensions: width 360 height 640 depth 290 Completely made of wood. They made the history of speakers. The cabinet is intact, maybe a bit dry, I would recommend a coat of straw oil to nourish it. Truly beautiful. Speakers for those who have fine tastes, foams replaced by a specialised technician, one of the two nets is damaged, the hemp is easy to replace. Specifications type: 3-way, 3 driver system speakers. Recommended amplifier: 25 W (minimum) Impedance: 4 Ω Bass: 1 x 12" cone Tweeter: 1 x 2", 1 x 1–38" dome Finish: mahogany, natural birch, pine, walnut, cherry, korina, teak Dimensions: 14 x 25 x 11–3/8 inch Safe packing.