K5 W12K5S4 12" Subwoofer + RXA‑T1 Amplifier Bundle
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Rockville
K5 W12K5S4 12" Subwoofer + RXA‑T1 Amplifier Bundle
K5 W12K5S4 12" Subwoofer + RXA‑T1 Amplifier Bundle
12" Car Subwoofer 350W RMS, RXA‑T1 2‑Ch Amp 370W RMS Bridged, 8 AWG Copper Kit
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Regular price
$157.90
Sale price
$157.90
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Features
- 12" sub adds tight, focused low end
- RXA‑T1 bridges to 370W RMS @ 4Ω
- Class A/B design with rich sound
- 8 AWG copper wiring kit included
- All install accessories provided
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What's Included in the box
- (1) W12K5S4 12" 4Ω Subwoofer
- RXA‑T1 2‑Channel Amplifier
- RWK81 8 AWG Amp Wiring Kit
SKU: SKU: W12K5S4+RXA-T1+RWK81
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Product Description
Craft a clean, musical bass upgrade with a high‑efficiency 12" sub and a refined Class A/B amplifier that bridges for focused power. Ideal for compact installs and OEM‑plus builds, the RXA‑T1’s adjustable filters and low THD pair with an 8 AWG copper kit for stable current and quiet signal transfer. A polished path to deeper, more satisfying lows.
This Bundle Includes

W12K5S4
The Rockville W12K5S4 12" 4-Ohm Car Subwoofer delivers powerful, clear bass with a 1400-watt peak and advanced voice coil. Its efficient cone and premium components suit custom builds and diverse enclosures, offering deep lows and lasting reliability for those seeking a refined, high-performance car audio experience.
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RXA-T1
The RXA-T1 2-channel amplifier delivers 1,500 watts of peak power and 370 watts RMS, engineered for superior sound in any car audio system. With advanced MOSFET technology, audiophile-grade components, and flexible installation, it’s the perfect upgrade for those who demand clarity, power, and premium performance on the road.
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RWK81
The Rockville RWK81 8 AWG Kit powers your car audio system with true-gauge wiring and 100% copper RCA cables. Flexible, durable, and engineered for clean signal transfer, it’s perfect for custom installs or upgrades, ensuring your amplifier runs cooler and delivers pure, powerful sound in any setup.
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Features
Musical Bass Upgrade
Stiff cone and foam surround deliver articulate slam and warmth without overpowering your front stage.
Bridged Power Headroom
RXA‑T1 provides 370W RMS bridged @ 4Ω with low distortion for confident, controlled performance.
Precision Tuning
Selectable HP/LP filters and 12dB EQ tailor the response to your enclosure and taste.
Premium Components
MOSFET supply, bipolar outputs, and ELNA capacitors add clarity and stability under load.
Install-Ready Kit
8 AWG wiring, RCAs, and hardware simplify setup and support solid current delivery.

Technical Specifications
- Type Car subwoofer and amplifier bundle
- Subwoofer 12" single 4Ω, 350W RMS, 1400W peak
- Amplifier 2‑channel Class A/B, 370W RMS bridged @ 4Ω
- Frequency Response (Sub) 25 Hz – 1.5 kHz
- Sensitivity (Sub) 88 dB
- Amp Frequency Response 10 Hz – 40 kHz
- Filters HP/LP 15–250 Hz, 12dB EQ
- Fuse (Amp) 50A Maxi
- Amp Dimensions 8.5" W x 1.8" H x 13" L
- Cutout Diameter (Sub) 11.02"
- Mounting Depth (Sub) 5.03"
- Weight (Sub) 10.1 lb