B&C Speakers Mid-Bass 8NW51 User manual

8NW51 Mid-Bass
LF Drivers LF Nd Drivers Coaxials HF Drivers Horns
400 W continuous program power capacity
50 mm (2 in) copper voice coil
70 – 3000 Hz response
96.5 dB sensitivity
Neodymium ring magnet assembly
Shorting copper cap for extended HF response
Ventilated voice coil gap for reduced power compression
Specification
Nominal Diameter 200 (8) mm (in)
Nominal Impedance (1) 8 Ohm
Minimum Impedence 7.7 Ohm
Nominal Power Handling (2) 200 W
Continuous Power Handling (3) 400 W
Sensitivity (1W/1m) (4) 96.5 dB
Frequency Range 70 - 3000 Hz
Voice Coil Diameter 51 (2) mm (in)
Winding Material Copper
Former Material Glass Fibre
Winding Depth 18.5 (0.73) mm (in)
Magnetic Gap Depth 10 (0.4) mm (in)
Flux Density 1.3 T
Thiele & Small Parameters
Fs 74 Hz
Re 5.2 Ohm
Qes 0.19
Qms 2.7
Qts 0.17
Vas 11 (0.4) dm3 (ft3)
Sd 220 (34.1) cm2 (in2)
Eta Zero 2.4 %
Xmax +/- 6 mm
Xvar +/- 6 mm
Mms 28 g
Bl 18.9 Txm
Le 0.4 mH
Mounting and Shipping Info
Overall Diameter 225 mm (8.8 in)
Bolt Circle Diameter 210 mm (8.3 in)
Baffle Cutout Diameter 187 mm (7.4 in)
Depth 100 mm (4 in)
Flange and Gasket Thickness 11 mm (0.4 in)
Net Weight 3 kg (6.6 lb)
Shipping Weight 3.4 kg (7.5 lb)
Shipping Box 300x160x180 mm
(11.8x6.3x7.1 in)
1For different impedances, please ask.
22 hours test made with continuous pink noise signal (6 dB crest factor).
Power calculated on rated minimum impedance.
3Power on Continuous Program is defined as 3 dB greater than the
Nominal rating.
4Applied RMS Voltage is set to 2.83V for 8 ohms or 2.0V for 4 ohms
Nominal Impedance