Floor speaker series roth oli system 2 way system principle active frequency response 55 20000 hz sensitivity 85 dbmw impedance 6 ohm amplifier type digital colour black design front firing subwoofer speaker enclosure bass reflex number of tweeters 1 tweeter material tweeter silk number of midbass drivers 2 midbass driver material woofer midrange fibreglass speaker terminals bi wiring width 884 mm height 180 mm depth 212 mm weight 11