Bookshelf speaker series monitor audio platinum power rating 120 watt principle passive frequency response 42 100000 hz sensitivity 88 dbmw noise level 113 db impedance 4 ohm crossover frequency 2800 hz recommended amplifier power 50 120 power supply passive housing surface veneer speaker enclosure bass reflex number of tweeters 1 tweeter type ribbon tweeter number of midbass drivers 1 bassmidtone chassis 165 mm speaker terminals bi wir