21 INCH SUBWOOFER 3 x 21" Bass Speaker Triple 21 inches woofer

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US $1-10,000 / Piece | 20 Piece/Pieces (Min. Order)
Supply Ability:
500 Piece/Pieces per Month
Guangzhou or Shenzhen
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Quick Details
Place of Origin:
Guangdong, China (Mainland)
Brand Name:
Model Number:
Black or Brown
Rated Power(RMS):
4 ohm(Front);8ohm(Rear)
1xNL4 Speakon
Enclosure Material:
High-strength Plywood
Cabinet Finish:
Germany Water Paint
Packaging & Delivery
Packaging Details
Carton or flightcase at extra cost
Delivery Time
7-15 days

21 INCH SUBWOOFER 3 x 21" Bass Speaker Triple 21 inches woofer





21" Cardioid Subwoofer


The INF-21 is a triple 21" cardioid Subwoofer for Installation Applications, incorporating excellent patented loading principles, designed for use in applications requiring accurate and powerful reproduction of low frequency energy at very high levels.


It has two bass-reflex chambers containing three 21" drivers, two facing forward in one chamber that are driven from one channel of amplifier and one facing backwards driven by another amplifier channel. 






*Triple 21" passive subwoofer speaker, front: 2400W RATED/9600W PEAK POWER, Rear: 1200W RATED/ 4800W PEAK POWER.

*Voice Coil of the 21” driver is 6 inches. PHT voice coil wire inside and outside rounding and BAF voice coil bobbin, can endure high temperature.

*The cone papers and spiders are imported from UKM.  

*Cardioid dispersion pattern avoids unwanted energy behind the system

*Greatly reduces the reverberant field at low frequencies, providing highest accuracy in low frequency reproduction

* Selecting Hypercardioid mode in the amplifier optimizes the tuning of front and rear channels for a maximum rejection at the left and right sides behind the cabinet

*Wooden lid for front grill is provided, as well as wheels at the rear side is included.





 Type:Triple 21" Large format cardioid subwoofer
1) Components: 2 x 21" front + 1 x 21" rear
(VC: 152.4 mm ; Mag: 330.25 mm)
2) Frequency Response: 27Hz - 90Hz(±3dB)
3) Sensitivity(1W/1M): 106dB
4) Maximum Peak SPL: 144dB(Front); 141 dB(Rear)
5) Rated Power(RMS): 2400W(Front); 1200W (Rear)
6) Peak Power(RMS): 9600W(Front); 4800W (Rear)
7) Impedance(Ohm): 4 ohm(Front); 8 ohm (Rear)
8) Connectors:1xNL4 Speakon
9) Enclosure Material: High-strength Plywood
10) Cabinet Finish: Germany Water Paint
11) Dimensions (W*D*H): 685 x 1180 x 1040 mm
12) Net. W.: 150 kg