Floor speaker series jbl arena system 2 way system principle passive frequency response 39 40000 hz sensitivity 88 dbmw impedance 8 ohm crossover frequency 2100 hz recommended amplifier power 20 225 power supply passive colour black front colour black speaker enclosures bass reflex magnetically shielded removable speaker cover number of tweeters 1 treble chassis 25 mm number of subwoofers 2 bass chassis 178 mm subwoofer material woofer