Bookshelf speaker power rating 50 watt system 2 way system principle passive impedances 4 6 8 ohm recommended amplifier power 10 100 power supply passive colour black housing material plastic enclosure speaker enclosures closed magnetically shielded number of mid range drivers 2 midtone chassis 63 mm width 106 mm height 280 mm depth 127 mm weight 18 kg area of use home cinema hifi system living room installation options shelf vertical