21 S 4 PL

Subwoofer
Code: Z008424

Nominal overall diameter: 21″
Nominal voice coil diameter: 4″
Magnet material: Neodymium
Basket material: Aluminium Die-Cast
Power: 2400 W
Sensitivity: 98.8 dB
Frequency range: 35-500 Hz

Description

Rated Power measured with 2 hours test with pink noise signal, 6dB crest factor, loudspeaker in free air, power calculated on rated Zmin
Power on Continuous Program is defined as 3 dB greater than the Rated Power
Sensitivity calculated by Thiele and Small parameters, for SPL average in box refer to frequency response
Thiele and Small parameters measured with laser system after preconditioning test
Xmax measured with respect to a THD of 10%
Xvar value corresponding to a decay of the Force Factor, or Compliance, or both, equal to the 50% of the small signal value.
Due to continuing product improvement, the features and the design are subject to change without notice.

Additional information

General Specifications

Nominal Diameter	545 mm / 21 in
Nominal Impedance	8 Ω
Rated Power AES	1200 W
Continuos Program Power	2400 W
Sensitivity @ 1W/1m	98.8 dB
Voice Coil Diameter	100 mm (4")
Voice Coil Winding Depth	23 mm
Magnetic Gap Depth	17 mm
Flux Density	0.89 T
Magnet Weight	536 g
Net Weight	10.5 Kg

Constructive Characteristics

Magnet Type	Neodymium
Basket Material	Aluminium Die-Cast
Voice Coil Winding Material	Copper
Voice Coil Former Material	Fiberglass
Cone Material	Paper
Cone Treatment	Humidity Resistant Pulp
Surround Material	Treated Cloth
Dust Dome Material	Solid Paper

Mounting Information

Overall Diameter	545 mm
Baffle Cutout Diameter	497 mm
Mounting Holes	8 holes 13×9 on Ø520 mm
Total Depth	249 mm

Thiele/Small Parameters

Re	5.7 Ω
Qms	9.95
Qts	0.30
Cms	65 µm/N
Vas	255.0 l
X max	+/- 5.2 mm
N	3.29 %
Fs	34.6 Hz
Qes	0.31
Mms	325 g
Bxl	36.10 Tm
Sd	1661.9 cm²
X var	+/- 10.7 mm
Le (1KHz)	1.60 mH

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