Woofer NBAC SB-Acoustics 8" SB23NBACS45-8 Aluminium Speaker

Features
Soft low damping rubber surround for improved transient response
Geometrically reinforced aluminium cone for improved break-up control
Shorting ring in motor system for reduced distortion
Vented pole piece for reduced compression
Vented cast aluminium chassis for optimum strength and low compression
Shallow design
Non-conducting fibre glass voice coil former for minimum damping
CCAW voice coil for reduced moving mass
Long life silver lead wires

Specs
Nominal Impedance 8 Ω
DC resistance, Re 5.7 Ω
Voice coil inductance, Le 0.37 mH
Effective piston area, Sd 216 cm2
Voice coil diameter 45.5 mm
Voice coil height 19 mm
Air gap height 6 mm
Linear coil travel (p-p) 13 mm
Magnetic flux density 0.9 T
Magnet weight 0.8 kg
Net weight 2.7 kg
Free air resonance, Fs 25 Hz
Sensitivity (2.83V/1m) 87.5 dB
Mechanical Q-factor, Qms 5.54
Electrical Q-factor, Qes 0.43
Total Q-factor, Qts 0.40
Moving mass incl. air,Mms 31.2 g
Force factor, Bl 7.9 Tm
Equivalent volume, Vas 93.4 liters
Compliance, Cms 1.43 mm/N
Mechanical loss, Rms 0.8 kg/s
Rated power handling* 60 W
* IEC 268-5, T/S parameters measured on drive units that are broken in.