Thunder-KS4 I
The Thunder-KS4 I is a compact, active subwoofer featuring two 18” neodymium magnet woofers and a powerful 4x 2500W @ 4Ω Class D amplifier module with built-in DSP. Designed as the core of K-array sound reinforcement systems, it supports a wide range of passive loudspeakers and integrates seamlessly with midrange speakers and other subwoofers.
Specifications
- Type: Active subwoofer
- Transducers: 2x 18" Neodymium magnet woofers
- Frequency Response: 30 Hz – 150/450 Hz (-6 dB) (1)
- Crossover: DSP-controlled, Low Pass @ 150 Hz, preset dependent
- Max SPL: 141 dB (2)
- Nominal Impedance: 4Ω
Connectivity
- Line Input: 2x XLR-F (Analog/AES3)
- Line Output: 2x XLR-M Link (Analog/AES3)
- Speaker Output: 2x SpeakON NL4
- Mains: powerCON TRUE1 TOP
- Networking & Data: 1x RJ45, 4x USB-A
Built-in DSP & Control
- DSP Features: Input gain, routing matrix, delay, full parametric IIR filters (Peaking, Shelving, High/Low Pass, Butterworth), onboard preset, remote monitoring
- Control: Wi-Fi dedicated mobile app, K-framework3 via wired Ethernet connection
Handling and Finishes
- Dimensions (W x H x D): 1106 x 500 x 580 mm (43.5 x 19.7 x 22.8 in) (3)
- Weight: 60 kg (132.3 lb)
- Material: Polyurea coated birch plywood
- Colors: Black, White, Custom RAL
Regulations
- IP Rating: IP53 (4)
Amplifier
- Amplifier Module: 4-channel Class D
- Output Power: 4 x 2500W @ 4Ω (5)
- Power Consumption: 600 VA @ 8Ω load, Pink noise, 1/8 rated power
Notes:
(1) With dedicated preset.
(2) Maximum SPL is calculated using a signal with crest factor 4 (12 dB) measured at 1 m.
(3) Includes 17 mm (0.7 in) removable rubber feet.
(4) For permanent installations in critical environments (swimming pools, beaches, yachts, etc.), additional protection is recommended. Contact K-array for best protection practices.
(5) CTA-2006 Standard, single channel driven.
New materials and design updates may be introduced without prior notice.
Documents
Click here to view the Technical Data
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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.