27TDFC H1189
27TDFC
H1189
27TDFC is a High Definition precoated fabric dome tweeter with a wide, soft
polymer surround and a rear chamber.
Sonotex precoated fabric diaphragm with high consistency and excellent stability
against variations in air humidity
Sonomax surround for low resonance and excellent mechanical linearity.
Voice coil windings immersed in magnetic fluid increase short term power handling
capacity and reduce the compression at high power levels.
Stiff and stable rear chamber with optimal acoustic damping allows the tweeter 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.
100
50
95
90
40
85
SPL [dB]
75
70
20
65
60
Impedance [ohm]
30
80
10
55
50
100
0
1 000
10 000
Frequency [Hz]
The frequency responses above show measured free field sound pressure in 0, 30, and 60
degrees, mounted in a 0.6m by 0.8m baffle. Input 2.83 Vrms, microphone distance 0.5m,
normalized to SPL 1m. The impedance is measured without baffle using a 2V sine signal.
Nominal Impedance
6 Ohms
Voice Coil Resistance
4.8 Ohms
Recommended Frequency Range
1500 - 25000 Hz
Voice Coil Inductance
0.05 mH
Short Term Power Handling *
220 W
Force Factor
3.5 N/A
Long Term Power Handling *
90 W
Free Air Resonance
550 Hz
Characteristic Sensitivity (2.83V, 1m) 90 dB
Moving Mass
0.37 g
Voice Coil Diameter
26 mm
Effective Piston Area
7.5 cm2
Voice Coil Height
1.5 mm
Magnetic Gap Flux Density
1.8 T
Air Gap Height
2.0 mm
Magnet Weight
0.25 kg
Linear Coil Travel (p-p)
0.5 mm
Total Weight
0.50 kg
Jul 2007-1
RoHS compliant product
*IEC 268-5, via High Pass Butterworth Filter 2500Hz 12 dB/oct.
SEAS reserves the right to change technical data
T27-531
www.seas.no
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