The KS3P is a high-performance 21" passive subwoofer designed to deliver deep, powerful low frequencies for professional audio applications. Featuring a neodymium magnet woofer, it offers a frequency response of 30 Hz – 150/300 Hz, with a DSP-controlled low-pass crossover for precise sound tuning.
With an impressive peak power of 2800W and a maximum SPL of 139 dB, the KS3P ensures exceptional output and omnidirectional coverage. Built from polyurea-coated birch plywood, it provides durability and resistance to demanding environments. Its IP54 rating ensures protection against dust and water splashes. Available in black, white, or custom RAL colors, it’s a versatile choice for any setup.
Specifications
General
-
Type:
Passive subwoofer
-
Transducers:
21" neodymium magnet woofer
-
Frequency Response:
30 Hz - 150/300 Hz (-6 dB) crossover dependant
(1) -
Crossover:
DSP-controlled, Low Pass @ 150 Hz, preset dependant
-
Max SPL:
139 dB
(2) -
Rated Power:
2800W peak
-
Coverage:
Omni
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Connectors:
2x speakON 2+ 2- / 1+ 1- link
-
Nominal Impedance:
4Ω
Handling and Finishes
-
Dimensions (W x H x D):
735 x 580 x 700 mm
(28.9 x 22.83 x 27.55 in)(3) -
Weight:
49,2 kg (108.5 lb)
-
Material:
Polyurea coated birch plywood
-
Colors:
Black/White/Custom RAL
Regulations
-
IP Rating:
IP54
(4)
- (1) With dedicated preset
- (2) Maximum SPL is calculated using a signal with crest factor 4 (12dB) measured at 1 m.
- (3) Included 17 mm (0.7 in) removable rubber feet
- (4) In case of permament, long lasting installation in critical environments (swimming pools, beaches, yachts..), we recommend to further protect the subwoofer. Contact K-array directly to discuss best protection practices.
Passive loudspeakers requires dedicated preset loaded on board of K-array amplifiers.
New materials and design are introduced into existing products without previous notice.

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Downloads
KS3 I GLL
Thunder-KS3PI Datasheet-ESP
Thunder-KS3P l Datasheet
ver 0.2
CE Declaration of Conformity
Thunder KS User Manual
KS MK1 Subwoofer Quick Guide
KS3 I DWG 3D
KS3P Layout
KFramework3 v3.3.6 Windows
Ver. 3.3.6
KFramework3 v3.3.6 Osx
Ver. 3.3.6
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