Bookshelf speaker series polk audio rti a power rating 125 watt system 2 way system principle passive frequency response 40 27000 hz sensitivity 89 dbmw impedance 8 ohm crossover frequency 1900 hz recommended amplifier power 20 125 power supply passive housing surface veneer speaker enclosure bass reflex speaker terminals bi wiring width 3048 mm height 1873 mm depth 2921 mm weight 544 kg area of use home cinema hifi system livin