MODEL??	FBF40-4
DIMENSION??	40mm  x  10.5mm or 40mm  x  8.5mm
VOICE COIL IMP??	8 ohm
SOUND PRESSVRE LEVEL?¡§S.P.L????	90 dB
RESONAT FREQUENEY??	520 Hz
EFFECTIVE FREQUENEY??	fo-11000 Hz
NOISE POWER??	0.25w
MAGNET SIZE AND ASSEMBLY??	21mm Ferrite