seas H 881 Response curve recorded in 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 27TFFC Cumulative spectral decay 27mm High Definition soft dome tweeter with diaphragm and integral surround made from SONOLEX, a precoated lightweight fabric material developed by SEAS. Combined with SEAS` unique diaphragm production technology, this material gives superior high frequency response and consistency compared with traditional methods and materials. Furthermore, a very high degree of stability against changes in air temperature and humidity is acheived. The voice coil is wound on an aluminium voice coil former with adequate ventilating holes to eliminate noise from internal air flow. The voice coil is immersed in low viscosity magnetic fluid, for high power handling capacity and simplified crossover design. A stiff and stable rear chamber with optimal acoustic damping allows 27TFFC to be used with moderately low crossover frequencies. The chassis is precision moulded from glass fibre reinforced plastic, and its front design offers optimum radiation conditions. NOMINAL IMPEDANCE 6 RECOMMENDED FREQUENCY RANGE Ohms 2000-30000 Hz SHORT TERM MAXIMUM POWER* 200 W LONG TERM MAXIMUM POWER * 80 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 ) 91 dB SPL MOVING MASS OPERATING POWER ( 96 dB SPL , 1 m ) 3.2 W EFFECTIVE PISTON AREA 7.6 sq.cm LINEAR COIL TRAVEL ( p-p ) 0.5 mm AIR GAP HEIGHT 2.0 mm MAGNETIC GAP FLUX DENSITY 1.8 T FREE AIR RESONANCE 900 Hz FORCE FACTOR 3.5 N/A NOTES MAGNET WEIGHT 0.25 Kg TOTAL WEIGHT 0.52 Kg * IEC 268-5, VIA HIGH PASS BUTTERWORTH FILTER: 3000 Hz MAR.95 T27-701 4.8 Ohms 0.25 g 12 dB/oct.
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