H 605 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 19TFFD Cumulative spectral decay 19mm High Fidelity dome tweeter with extremely smooth frequency response. The chassis is injection moulded in high grade glass fibre reinforced plastic. The diaphragm and suspension is made from a precoated fabric using a unique production method developed by SEAS. The precoating allows very tight production tolerances and high consistency. The voice coil is wound on an aluminium voice coil former with ventilating holes which eliminate problems connected with resonances in the internal cavities. A double magnet reduces stray fields around the magnet system which allows the unit to be used in close proximity to a CRT. The double magnet also gives a higher sensitivity. 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. NOTES 8 NOMINAL IMPEDANCE RECOMMENDED FREQUENCY RANGE Ohms 4000-20000 Hz VOICE COIL RESISTANCE 0.05 mH VOICE COIL DIAMETER 19.5 mm SHORT TERM MAXIMUM POWER* 200 W LONG TERM MAXIMUM POWER* 88 W VOICE COIL HEIGHT CHARACTERISTIC SENSITIVITY (1W , 1m) 87 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 2.8 N/A MAGNET WEIGHT TOTAL WEIGHT PREL8 1.5 mm 0.20 g FREE AIR RESONANCE 1700 Hz 0.24 Kg 0.30 Kg * IEC 268-5, VIA HIGH PASS BUTTERWORTH FILTER: APR.97 6.2 Ohms VOICE COIL INDUCTANCE (EQUIVALENT) 5000 Hz 12 dB/oct.
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