Thunder-KS3 I
The Thunder-KS3 I is an active subwoofer from K-Array, built around a 21-inch neodymium magnet woofer paired with a four-channel Class D amplifier module and built-in DSP. It powers a range of K-Array passive loudspeakers directly and supports remote monitoring and control via mobile app or Ethernet.
Specifications
- Type: Active subwoofer
- Woofer: 21-inch neodymium magnet, long excursion
- Frequency response: 30 Hz to 150 Hz / 450 Hz (-6 dB, with dedicated preset)
- Max SPL: 139 dB (crest factor 4, measured at 1 m)
- Amplifier: 4-channel Class D, 4 x 2500 W at 4 ohm (CTA-2006, single channel driven)
- Nominal impedance: 4 ohm
- Power consumption: 600 VA at 8 ohm load, pink noise, 1/8 rated power
- Crossover: DSP-controlled, low-pass at 150 Hz (preset dependent)
- DSP features: Input gain, routing matrix, delay, full parametric IIR filters (peaking, shelving, high/low pass, Butterworth), onboard preset storage, remote monitoring
- Line input: 2 x XLR female, analogue and AES3
- Line output: 2 x XLR male link, analogue and AES3
- Speaker output: 2 x SpeakON NL4
- Mains connector: powerCON TRUE1 TOP
- Networking: 1 x RJ45, 4 x USB-A
- Control: Wi-Fi mobile app, K-framework3 via wired Ethernet
- Dimensions (W x H x D): 735 x 580 x 700 mm (includes 17 mm removable rubber feet)
- Weight: 49.2 kg
- Enclosure: Polyurea-coated birch plywood
- Colours: Black, White, Custom RAL
- IP rating: IP53
Applications
The Thunder-KS3 I suits large-scale live sound reinforcement, touring productions, and fixed installations where a single powered subwoofer must anchor a distributed system. The onboard DSP eliminates external processing for basic configurations, and the SpeakON power outputs allow direct connection of passive satellite loudspeakers without additional amplification.
Standards and compliance
IP53 ingress protection rating (dust partial protection, water spray resistance at up to 60 degrees). For critical permanent environments such as swimming pools, beaches, or yachts, additional protection is recommended.
Frequently asked questions
What DSP processing is built into the Thunder-KS3 I?
The onboard DSP provides input gain control, a routing matrix, delay, full parametric IIR filters including peaking, shelving, high/low pass, and Butterworth types, along with onboard preset storage and remote monitoring capability.
Can the Thunder-KS3 I drive passive loudspeakers in addition to reproducing bass?
Yes. Two SpeakON NL4 speaker outputs allow the 4-channel Class D amplifier to power K-Array passive midrange loudspeakers directly from the subwoofer unit.
What is the lowest frequency the Thunder-KS3 I reproduces?
With a dedicated preset loaded, the unit extends bass response down to 30 Hz (-6 dB).
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.