25TAFC/D H 537 TWEETER
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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