21NDS151U1 Subwoofers 21 inchs
Notes
- 6 INCH COPPER VOICE COIL
- 97 dB/SPL SENSITIVITY
- 4400 WATT PROGRAM POWER HANDING
- FEM OPTIMIZED MOTOR AND SUSPENSIONS
- 53mm PEAK TO PEAK MAXIMUM EXCURSION
- OPTIMIZED COOLING SYSTEM
- ALUMINIUM DEMODULATING RING
- DOUBLE SPIDER
- RESONANCE FREE AND HEAVY DUTY BASKET DESIGN
- TRIPLE ROLL SURROUND
- 97 dB/SPL SENSITIVITY
- 4400 WATT PROGRAM POWER HANDING
- FEM OPTIMIZED MOTOR AND SUSPENSIONS
- 53mm PEAK TO PEAK MAXIMUM EXCURSION
- OPTIMIZED COOLING SYSTEM
- ALUMINIUM DEMODULATING RING
- DOUBLE SPIDER
- RESONANCE FREE AND HEAVY DUTY BASKET DESIGN
- TRIPLE ROLL SURROUND
GENERAL SPECIFICATIONS
Nominal diameter | 548(21) mm (in.) |
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Nominal impedance | 4 Ω |
Minimum impedance | 4.5 Ω |
Program power (1) | 4400 W |
AES Power rating(2) | 2200 W |
Sensitivity (3) | 97 dB |
Frequency range | 29 ~ 1000 Hz |
Voice coil diameter | 151(6) mm (in.) |
Chassis material | Aluminium |
Magnet material | Neodymium |
Magnet dimensions (ODxIDxh) | 145 x 60 x 10 mm |
Coil material | SV |
Former material | Glass Fiber |
Xmax(4) | 15.8 mm |
Xmech(5) | 26.5 mm |
Gap height | 17 mm |
Voice coil Winding height | 40 mm |
SMALL SIGNAL PARAMETERS
DC resistance(Re) | 3.6 Ω |
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Resonance frequency(Fs) | 29 Hz |
Moving mass(Mms) | 407 g |
Compliance(Cms) | 0.07 mm/N |
Force factor(BL) | 32 N/A |
Mechanical Q-factor(Qms) | 5.8 |
Electrical Q-factor(Qes) | 0.35 |
Total Q-factor(Qts) | 0.33 |
Equivalent air volume(Vas) | 371 I |
Voice coil Inductance(Le) | 3.20 mH |
Diaphragm area(Sd) | 1750 cm2 |
Reference efficiency(Eta O) | 2.9 % |
SHIPPING INFORMATION
Net weight | 22.1 Kg |
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Multipack size (1) (W x D x H) | 570 x 570 x 307 mm |
Multipack weight | 24.6 Kg |
OTHERS
(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.
(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.