Product Specifications |
Manufacturer |
SB ACOUSTICS |
Speaker Type |
Paper Cone Midrange |
Nominal Diameter |
12cm |
Impedance |
4 ohms |
Power Handling (RMS) |
30 W |
Resonance Frequency |
61 Hz |
Sensitivity |
87 dB |
Voice Coil Diameter |
25.4mm |
SB ACOUSTICS SB12NRXF25-4, 12cm NOREX PAPER CONE MIDWOOFER 4OHM
Features
Proprietary cone material with natural fibres made in-house
Foam surround for maximum transparency and midrange resolution
Vented pole piece for reduced compression
Vented cast aluminium chassis for optimum strength and low compression
CCAW voice coil for reduced moving mass
Long life silver lead wires
Non-conducting fibre glass coil former for minimum damping
Specs
Nominal Impedance 4 Ω
DC resistance, Re 3.1 Ω
Voice coil inductance, Le 0.27 mH
Effective piston area, Sd 50 cm2
Voice coil diameter 25.4 mm
Voice coil height 15 mm
Air gap height 5 mm
Linear coil travel (p-p) 10 mm
Magnetic flux density 0.84 T
Magnet weight 0.32 kg
Net weight 0.75 kg
Free air resonance, Fs 61 Hz
Sensitivity (2.83 V / 1 m) 87 dB
Mechanical Q-factor, Qms 5.3
Electrical Q-factor, Qes 0.53
Total Q-factor, Qts 0.48
Moving mass incl. air, Mms 5.8 g
Force factor, Bl 3.6 Tm
Equivalent volume, VAS 4.1 liters
Compliance, Cms 1.17 mm/N
Mechanical loss, Rms 0.42 kg/s
Rated power handling* 30 W
* IEC 268-5, T/S parameters measured on drive units that are broken in.