Thunder-KS4P I
The Thunder-KS4P I is a passive subwoofer from K-Array, housing two 18-inch neodymium magnet woofers in a polyurea-coated birch plywood enclosure. It delivers extended low-frequency output down to 30 Hz and reaches a peak SPL of 141 dB, making it suited to large-scale live sound reinforcement and permanent installation projects.
Specifications
- Type: Passive subwoofer
- Transducers: 2 x 18-inch neodymium magnet woofers, 3-inch voice coil
- Frequency response: 30 Hz to 150 Hz or 450 Hz (-6 dB, with dedicated preset)
- Crossover: DSP-controlled, low pass at 150 Hz (preset dependent)
- Max SPL: 141 dB peak (crest factor 4, measured at 1 m)
- Rated power: 2,800 W peak
- Nominal impedance: 4 ohm
- Connectors: 2 x SpeakON NL4 (supports 2-wire and 4-wire; allows signal routing to additional loudspeakers)
- Dimensions (W x H x D): 1,106 x 500 x 580 mm (includes 17 mm removable rubber feet)
- Weight: 53.2 kg
- Enclosure material: Polyurea-coated birch plywood
- Colours: Black, White, Custom RAL
- IP rating: IP54
Applications
The Thunder-KS4P I is used in large-scale live sound events, touring rigs, and fixed installation venues requiring high-output, controlled low-frequency reinforcement. Its IP54 rating allows use in sheltered outdoor settings such as festivals, open-air stages, beaches, and yachts, though additional protection is recommended for permanent critical-environment installations such as swimming pools.
Standards and compliance
IP54 rated for resistance to dust ingress and water splashing from any direction.
Frequently asked questions
Does the Thunder-KS4P I require a specific amplifier?
Yes. As a passive loudspeaker it requires a dedicated DSP preset loaded on a K-Array amplifier to operate correctly within its specified frequency range.
What connection formats does it support?
It uses two SpeakON NL4 connectors and supports both 2-wire and 4-wire configurations, with the ability to route signal through to additional loudspeakers in a chain.
Can it be used outdoors permanently?
Its IP54 rating permits sheltered outdoor use. For permanent installations in critical environments such as swimming pools or marine settings, K-Array recommends contacting them for additional protection guidance.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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FAQs
What is your return policy?
All refunds and returns are determined by the manufacturer's terms of sale. Change-of-mind refunds are not accepted, but all valid warranty claims will be managed by AKA Acoustics in compliance with consumer law.
How long will it take to receive my order?
Freight lead times will be provided upon order confirmation. Standard items typically ship within 4–6 weeks, while custom orders may take 6–12 weeks.
Is my payment information secure?
Yes, all payments are securely processed through Stripe and are protected under their Terms of Service. AKA Acoustics do not store any payment information ourselves.
How are freight costs calculated?
Freight costs are determined at the time of quotation to ensure accurate pricing based on your specific order. For any questions, please email sales@akaacoustics.com
How can I contact support?
For account inquiries, email accounts@akaacoustics.com. For order support, email sales@akaacoustics.com.