Centre speaker series jbl arena system 2 way system principle passive frequency response 90 40000 hz sensitivity 89 dbmw impedance 8 ohm crossover frequency 2500 hz recommended amplifier power 20 150 power supply passive colour black front colour black housing surface paint speaker enclosures bass reflex magnetically shielded removable speaker cover number of tweeters 1 treble chassis 25 mm number of subwoofers 2 bass chassis 140 mm