MODEL??	FBF21-1
DIMENSION??	21mm  x  7mm
VOICE COIL IMP??	8 ohm
SOUND PRESSVRE LEVEL?¡§S.P.L????	70 dB
RESONAT FREQUENEY??	600 Hz
EFFECTIVE FREQUENEY??	fo-20000 Hz
NOISE POWER??	0.25 w
MAGNET SIZE AND ASSEMBLY??	16mm Ferrite