Crazy and Powerful PA 21 Inch Subwoofer

• Noise: <95dB
• Hi-Fi: Not Hi-Fi
• Activity: Passive
• Operation Mode: Put in Cabinet
• Speaker System: Professional
• Speaker Material: Wood
• Model NO.: 21NDS151U1-4
• Application: Professional
• Certification: CE, RoHS, CCC, UL, FCC
• Monitor: No
• THD: <0.005%
• Transport Package: Imported Stronger Paper Cone
• Specification: 21 inch
• Trademark: HIWELL
• Origin: Made in China
• HS Code: 8518290000
• Production Capacity: 10000PCS/Year

Product Description

Crazy and Powerful Pa 21 inch subwoofer 

1.6inch Copper Voice Coil, 97dB/SPL 
2. Biggest Power 2200W AES standard
3. Double Spider Conex, Aluminum Demodulating Ring
4. 53mm PEAK To PEAK MAXIMUM Excursion
5. 8 OHMS are available.

GENERAL SPECIFICATIONS
Nominal diameter		mm (in.)	548(21)
Nominal impedance		Ω	4
Minimum impedance		Ω	4.5
Program power (1)		W	4400
AES Power rating(2)		W	2200
Sensitivity (3)		dB	97
Frequency range		Hz	29 ~ 1000
Voice coil diameter		mm (in.)	151(6)
Chassis material		Aluminium	p
Magnet		material	Neodymium
Magnet dimensions (ODxIDxh)		mm	145 x 60 x 10
Coil material			SV
Former material			Glass Fiber
Xmax(4)		mm	15.8
Xmech(5)		mm	26.5
Gap height		mm	17
Voice coil Wingding height		mm	40
SMALL SIGNAL PARAMETERS
DC resistance	Re	Ohm	3.6
Resonance frequency	Fs	Hz	29
Moving mass	Mms	g	407
Compliance	Cms	mm/N	0.07
Force factor	BL	N/A	32
Mechanical Q-factor	Qms		5.8
Electrical Q-factor	Qes		0.35
Total	Q-factor	Qts	0.33
Equivalent air volume	Vas	I	371
Voice coil Inductance	Le	mH	3.20
Diaphragm area	Sd	cm²	1750
Reference efficiency	Eta 0	%	2.9
SHIPPING INFORMATION
Net weight		Kg	22.1
Multipack size (1) (W x D x H)		mm	570 x 570 x 307
Multipack weight		Kg	24.6