Bookshelf speaker series monitor audio radius power rating 25 watt effective output 50 watt system 2 way system principle passive frequency response 120 20000 hz sensitivity 87 dbmw noise level 101 db impedance 8 ohm power supply passive speaker enclosure closed number of tweeters 1 treble chassis 20 mm number of midbass drivers 1 bassmidtone chassis 75 mm width 100 mm height 100 mm depth 124 mm weight 1 kg area of use home cinema