Adastra AB-5 speakers are supplies as a pair of passive low impedance bookshelf speaker cabinets finished in black woodgrain vinyl with M6 mounting points at the rear. Each speaker provides maximum power conversion with most stereo amplifiers which can operate down to 4 Ohms, and is fitted with a 5.25" main driver and a 1" silk dome tweeter for balanced, full range output. A perfect match for Adastra and other low impedance amplifiers for background music, radio and voice announcements.