Bookshelf speaker satellite speaker series monitor audio radius power rating 75 watt system 2 way system principle passive frequency response 85 35000 hz sensitivity 83 dbmw noise level 102 db impedance 8 ohm recommended amplifier power 30 100 power supply passive speaker enclosure bass reflex number of tweeters 1 treble chassis 25 mm number of midbass drivers 1 bassmidtone chassis 100 mm bass reflex port position rear firing port width