Floor speaker series jbl studio 2 system 3 way system principle passive sensitivity 91 dbmw impedance 8 ohm power supply passive colour black housing material mdf enclosure design front firing subwoofer speaker enclosures bass reflex magnetically shielded number of tweeters 1 number of mid range drivers 1 number of subwoofers 2 bass reflex port position rear firing port speaker terminals bi wiring width 1 197 mm height 273 mm depth 330 mm