Material
Cone: PFP
Surround: Rubber
Basket: Aluminum
Spider: Nomex
Coil former: Aluminium
Dust Cap: Paper

Specifications
Power: Pe 400/600 RMS/Nom
DC resistance: Rdc 3,4 Ω
Nominal impedance: ZN 4 Ω
Resonance frequency: fs 30 Hz
Voice coil diameter: 2,5 inch
X-Max: +/- 12,5 mm
Mechanical Q factor: Qms 7,34
Electrical Q factor: Qes 0,49
Total Q factor: Qts 0,46
Moving mass: md 98,57 g
Effective piston area: Sd 346 cm2
Mechanical resistance: Rms 2,77 kg/s
Compliance: Cms 0,28 mm/N
Force factor: BL 10,9 Tm
Equivalent air volume: Vas 47,25 dm3
SPL 2,83V/1m: 90 dB
External diameter: 260 mm / 10,24 inch
Installation diameter: 236 mm / 9,29 inch
Installation depth: 149 mm / 5,87 inch
Magnet diameter: 155 mm / 6,10 inch