H 537 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 25TAFC/D Cumulative spectral decay 25mm High Fidelity dome tweeter with glass fibre reinforced plastic chassis. The unit features high efficiency and smooth, extended response. Its aluminium diaphragm with critically designed shape and thickness behaves like a piston throughout the audible frequency range, resulting in good dispersion above 10 kHz. A carefully designed diffuser protects the diaphragm and compensates for a slight axial roll off towards 20 kHz. The specially designed soft surround allows a low fundamental frequency and excellent mechanical linearity. A damped hole in the pole piece and a tuned chamber behind the magnet, result in a low resonance frequency. The voice coil is immersed in magnetic fluid, allowing high power handling capacity and simplified crossover design. 6 NOMINAL IMPEDANCE RECOMMENDED FREQUENCY RANGE Ohms 2000-25000 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 26 mm VOICE COIL HEIGHT 1.5 mm CHARACTERISTIC SENSITIVITY (1W , 1m) 90 dB SPL MOVING MASS OPERATING POWER (96 dB SPL , 1 m) 4.0 W EFFECTIVE PISTON AREA 7.0 sq.cm LINEAR COIL TRAVEL ( p-p ) 0.5 mm AIR GAP HEIGHT 2.0 mm MAGNETIC GAP FLUX DENSITY 1.8 T FORCE FACTOR 3.5 N/A NOTES MAGNET WEIGHT 0.25 Kg TOTAL WEIGHT 0.50 Kg T25-402 0.33 g FREE AIR RESONANCE * IEC 268-5, VIA HIGH PASS BUTTERWORTH FILTER: JUL.96 4.8 Ohms 3000 1200 Hz Hz 12 dB/oct.
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