- 4 INCH COPPER VOICE COIL
 
- 97.7 dB/SPL SENSITIVITY
 
- 2000 WATT PROGRAM POWER HANDING
 
- FEM OPTIMIZED MOTOR AND SUSPENSIONS
 
- OPTIMIZED COOLING SYSTEM
 
- DOUBLE SPIDER
 
- RESONANCE FREE AND HEAVY DUTY BASKET DESIGN
 
- ALUMINIUM DEMODULATING RING
 
- TRIPLE ROLL SURROUND

Nominal diameter	461(18) mm (in.)
Nominal impedance	8 Ω
Minimum impedance	6.6 Ω
Program power (1)	2000 W
AES Power rating(2)	1000 W
Sensitivity (3)	97.7 dB
Frequency range	40 ~ 1000 Hz
Voice coil diameter	100(4) mm (in.)
Chassis material	Aluminium
Magnet material	Neodymium
Magnet dimensions (ODxIDxh)	97 x 25 x 10 mm
Coil material	SV
Former material	Glass Fiber
Xmax(4)	10.5 mm
Xmech(5)	16 mm
Gap height	10 mm
Voice coil Winding height	26 mm

DC resistance(Re)	5.5 Ω
Resonance frequency(Fs)	40 Hz
Moving mass(Mms)	243 g
Compliance(Cms)	0.08 mm/N
Force factor(BL)	26.90 N/A
Mechanical Q-factor(Qms)	10.4
Electrical Q-factor(Qes)	0.45
Total Q-factor(Qts)	0.43
Equivalent air volume(Vas)	145 I
Voice coil Inductance(Le)	1.80 mH
Diaphragm area(Sd)	1325 cm2
Reference efficiency(Eta O)	2.3 %

Net weight	10.6 Kg
Multipack size (1) (W x D x H)	485 x 485 x 245 mm
Multipack weight	12.6 Kg

(1)Program power is defined as 3 dB greater than AES Power.
(2) Tested for two hours using a continuous, band-limited pink noise signal as per AES 2-1984 Rev. 2003. Loudspeaker tested in free air.
(3) From T/S parameters, measured with LMS DA LPM module.
(4) The Xmax is calculated as: (Hvc - Hg)/2+ Hg/4. Hvc is the voice coil height and Hg the gap height.
(5) The Xmech is calculated as: (Hvc - Hg)/2 +(Hg-2). Hvc is the voice coil height and Hg the gap height.
(6) Thiele-Small parameters are measured after preconditioning: a) at 20°C- 22°C, 50% humidity for 2 hours; b) by LMS LSI measurement.