Floor speaker series jbl arena system 2 way system principle passive frequency response 44 40000 hz sensitivity 87 dbmw impedance 8 ohm crossover frequency 2100 hz recommended amplifier power 20 200 power supply passive colour white speaker enclosures magnetically shielded removable speaker cover number of tweeters 1 treble chassis 25 mm number of subwoofers 1 bass chassis 178 mm subwoofer material woofer celluosepaper bass reflex port