H 561 Response curve recorded in an anechoic chamber (Free-field, 4 pi radiation) with 0.5m microphone distance. The loudspeaker is mounted in a 0.6m by 0.8m baffle. OF NORWAY TWEETER 19TAF/D Cumulative spectral decay 19mm High Fidelity dome tweeter with smooth, extended frequency response. The chassis is injection moulded in high grade glass fibre reinforced plastic. The diaphragm is made from a thin aluminium sheet and suspended by a specially designed soft surround which allows for a low fundamental frequency. A carefully designed diffuser protects the diaphragm and compensates for a slight axial roll of towards 20 kHz. The voice coil is wound on an aluminium voice coil former with ventilating holes which eliminate problems connected with resonances in the internal cavities. The voice coil windings are immersed in magnetic fluid to increase short term power handling capacity, to reduce the compression at high power levels and to significantly reduce the Q factor. 8 NOMINAL IMPEDANCE RECOMMENDED FREQUENCY RANGE Ohms 4000-20000 Hz SHORT TERM MAXIMUM POWER* 220 W LONG TERM MAXIMUM POWER* 90 W VOICE COIL RESISTANCE VOICE COIL INDUCTANCE (EQUIVALENT) 0.05 mH VOICE COIL DIAMETER VOICE COIL HEIGHT 1.5 mm 88 dB SPL MOVING MASS OPERATING POWER (96 dB SPL , 1 m) 6.3 W EFFECTIVE PISTON AREA 4.0 sq.cm LINEAR COIL TRAVEL ( p-p ) 0.5 mm AIR GAP HEIGHT 2.0 mm MAGNETIC GAP FLUX DENSITY 1.4 T FORCE FACTOR 2.6 N/A MAGNET WEIGHT 0.12 Kg TOTAL WEIGHT 0.30 Kg 0.23 g FREE AIR RESONANCE * IEC 268-5, VIA HIGH PASS BUTTERWORTH FILTER: T19-202 19.5 mm CHARACTERISTIC SENSITIVITY (1W , 1m) NOTES JUL.96 6.2 Ohms 5000 1700 Hz Hz 12 dB/oct.