Scanspeak D2905 930000 1” Dome Tweeter 6Ω 150 Watt

• Resonance frequency [fs] 650 Hz
• Mechanical Q factor [Qms] 0.94
• Electrical Q factor [Qes] 0.72
• Total Q factor [Qts] 0.41
• Force factor [Bl] 3.5 Tm
• Mechanical resistance [Rms] 1.96 kg/s
• Moving mass [Mms] 0.45 g
• Suspension compliance [Cms] 0.13 mm/N
• Effective diaph. diameter [D] 33 mm
• Effective piston area [Sd] 8.5 cm²
• Equivalent volume [Vas] 0.01 l
• Sensitivity (2.83V/1m) 90 dB
• Ratio Bl/√Re 1.61 N/√W
• Ratio fs/Qts 1598 Hz

• Nominal impedance [Zn] 6 Ω
• Minimum impedance [Zmin] 5.4 Ω
• Maximum impedance [Zo] 10.9 Ω
• DC resistance [Re] 4.7 Ω
• Voice coil inductance [Le] 0.07 mH
• Power Handling 100h RMS noise test (IEC 17.1)* 150 W

• Voice coil diameter 28 mm
• Voice coil height 3.3222 mm
• Voice coil layers 2
• Height of gap 2.5 mm
• Linear excursion ± 0.4 mm
• Max mech. excursion ± 1.5 mm
• Unit weight 0.7 kg

Driver 140WRMS, 108dB, 500-18.000 Hz

2" high frequency compression driver. The particular mylar/titanium
diaphragm using a 3" edgewound flat aluminium wire voice coil and a
optimized high energy ceramic magnet assembly using a copper shorting
ring assembly produce smooth response and excellent sonic properties .

Specifications1
Throat Diameter 50 mm (2 in)
Nominal Impedance 8 Ω
Minimum Impedance 8 Ω
Power Handling
(1000 –20000 Hz)
Nominal2 80 W
Continuous Program3 160 W
Sensitivity (1W/1m)4 108 dB
Frequency Range 0.5 – 18 kHz
Recommended Crossover5 1000 Hz
Voice Coil Diameter 75 mm (3 in)
Winding Material Aluminium
Inductance 0.14 mH
Diaphragm Material Titanium
Flux Density 1.8 T
Also available in 16 Ω, data upon request

Mounting and Shipping Information
Four M6 holes 90° on 102 mm (4 in) diameter
Overall Diameter 170 mm (6.7 in)
Depth 67 mm (2.6 in)
Net Weight (1 unit) 4.5 kg (9.9 lb)
Shipping Weight (2 units) 9.6 kg (21.2 lb)
Shipping Box (2 units) 210x210x190 mm
(8.3x8.3x7.5 in)
1 Driver mounted on B&C ME 75 horn.
2 2 hours test made with continuous pink noise signal (6 dB crest factor) within
the specified range. Power calculated on rated minimum impedance.
3 Power on Continuous Program is defined as 3 dB greater than the Nominal rating.
4 Applied RMS Voltage is set to 2.83V for 8 ohms and 4V for 16 ohms Nominal
Impedance. Average SPL from 500 to 18000 Hz.
5 12 dB/oct. or higher slope high-pass filter.