... 1.75",ferrite magnet,Maylar diaphragm driver 3.Great high quality sound,high sensitivity driver/tweeter driver/speaker driverFEATURES: 1.75",ferrite ... magnet,Maylar diaphragm driver 106dB sensitivity in 1w/1m ... diameterΦ44.4 mmMagnet dimensionΦ100*18 mmFs900 HzRe (D.C.)5.8 ΩQms/Qes/Qts /Vas/Cms/n. (%)/Bl ...