Haut-parleur 20cm B&C Speakers 8PS21
[8PS21]

Key features
400 W continuous program power capacity
50 mm (2 in) copper voice coil
70 – 3000 Hz response
94 dB sensitivity
Shorting copper cap for extended HF response

Specification
Nominal Diameter 200 (8) mm (in)
Nominal Impedance (1) 8 Ohm
Minimum Impedence 7 Ohm
Nominal Power Handling (2) 200 W
Continuous Power Handling (3) 400 W
Sensitivity (1W/1m) (4) 94 dB
Frequency Range 70 -3000 Hz
Voice Coil Diameter 50 (2) mm (in)
Winding Material Copper
Former Material Kapton
Winding Depth 16 (5/8) mm (in)
Magnetic Gap Depth 8 (5/16) mm (in)
Flux Density 1.1 T

Thiele & Small Parameters
Fs 73 Hz
Re 5.4 Ohm
Qes 0.36
Qms 4.2
Qts 0.33
Vas 14 (0.5) dm3 (ft3)
Sd 220 (34.1) cm2 (in2)
Eta Zero 1.5 %
Xmax +/- 5 mm
Xvar +/- 4.5 mm
Mms 23 g
Bl 12.6 Txm
Le 0.5 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 91 mm (3.6 in)
Flange and Gasket Thickness 11 mm (0.4 in)
Net Weight 3.4 kg (7.5 lb)
Shipping Weight 3.7 kg (8.1 lb)
Shipping Box 220x220x130 mm (8.7x8.7x5.1 in)

1- For different impedances, please ask.
2- 2 hours test made with continuous pink noise signal (6 dB crest factor). 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 or 2.0V for 4 ohms Nominal Impedance

Design
Surround Shape Double Roll 
Cone Shape Exponential 
Magnet type Ceramic Ring 
Shorting Copper Cap Yes 
Spider Single 
Pole Design Straight Pole