Midwoofer NBAC SB-Acoustics 5" SB15NBAC30-8 Aluminium Speaker

Features
Vented cast aluminum chassis for optimum strength and low compression
Geometrically reinforced aluminum cone for optimum piston operation and reduced break-up
Soft low damping rubber surround for improved transient response
Non-conducting fibre glass voice coil former for minimum damping
Extended copper sleeve on pole piece for low inductance and low distortion
CCAW voice coil for reduced moving mass
Long life silver lead wires
Vented pole piece for reduced compression

Specs
Nominal Impedance 8 Ω
DC resistance, Re 5.7 Ω
Voice coil inductance, Le 0.14 mH
Effective piston area, Sd 82 cm2
Voice coil diameter 30.5 mm
Voice coil height 14 mm
Air gap height 5 mm
Linear coil travel (p-p) 10 mm
Magnetic flux density 1.0 T
Magnet weight 0.54 kg
Net weight 1.46 kg
Free air resonance, Fs 35.5 Hz
Sensitivity (2.83 V / 1 m) 85.5 dB
Mechanical Q-factor, Qms 4.22
Electrical Q-factor, Qes 0.41
Total Q-factor, Qts 0.37
Moving mass incl. air, Mms 10 g
Force factor, Bl 5.7 Tm
Equivalent volume, VAS 17 liters
Compliance, Cms 1.81 mm/N
Mechanical loss, Rms 0.6 kg/s
Rated power handling* 50 W
* IEC 268-5, T/S parameters measured on drive units that are broken in.