The Thunder-KS3P I is a compact passive subwoofer with a long-excursion 21" neodymium magnet woofer and 4" voice coil, in a polyurea-coated Finnish birch plywood enclosure. Two speakON NL4 connectors take the signal from external active systems or amplifiers with a 2-wire or 4-wire cable and link it on to other loudspeakers. It needs a dedicated preset loaded on K-array amplifiers. Available in black and white.

Specifications

• Driver: 21" neodymium woofer, 4" voice coil
• Power: 2800 W peak
• Frequency range: 30 Hz - 150 Hz (-6 dB, preset dependent)
• Max SPL: 135 dB continuous, 139 dB peak
• Coverage: omni
• Impedance: 4 Ω
• Connections: 2 x speakON NL4
• Protection: IP54
• Enclosure: polyurea-coated Finnish birch plywood
• Dimensions (W x H x D): 735 x 580 x 700 mm
• Weight: 49.2 kg