Ceiling speaker in wall speaker series heco install power rating 100 watt effective output 180 watt system 2 way system principle passive frequency response 35 32000 hz sensitivity 90 dbmw impedances 4 6 8 ohm crossover frequency 3500 hz recommended amplifier power 30 140 power supply passive colour white speaker enclosures without casing removable speaker cover number of tweeters 1 treble chassis 25 mm number of subwoofers 1 bass cha