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Many in-stock orders ship within 1-2 business days, but timing varies by item. Custom, built-to-order, oversized, special-order and supplier-direct products may need extra processing time. Free shipping applies to qualifying orders over $99 in the contiguous US. Approved returns may be subject to a restocking fee.
Most products are covered by the manufacturer's warranty against defects. Damage from over-powering or improper installation isn't covered — we'll help coordinate any valid claim.
Tell us your vehicle, subwoofers and electrical setup and our team will help you match the right gear. Reach out before you buy.
Subwoofer Wiring Diagram
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Introducing the Down4Sound JP43, a monoblock amplifier that delivers a staggering 4300W RMS—and that's just the beginning. Engineered for bass aficionados, this is not your average 4000W amp. It's a sonic juggernaut designed to unleash monstrous, storm-level bass from your subwoofer.
Advanced Features for Peak Performance
- Dual Power and Ground Inputs: For optimal power stability, we've incorporated dual power and ground inputs.
- High-Quality RCA Connectors: Equipped with true Tiffany RCA connectors for unmatched signal integrity.
- Instant Cooling Fan: The internal fan kicks in as soon as you power up, ensuring the amplifier stays cool during intense usage.
Warranty Requires Electrical Upgrade
To unlock the full potential of this amplifier, a mandatory electrical upgrade is essential. Failure to meet these requirements will void the warranty. You'll need:
- The Big 3
- Upgraded Alternator
- Reserve Battery(s)
Power Ratings (Tested at 14.4V @ 1% THD)
- 1-ohm: 4300W RMS
- 2-ohm: 2300W RMS
- 4-ohm: 1300W RMS
Additional Technical Specifications
- Frequency Response: 14Hz – 260Hz
- Signal-to-Noise Ratio: 89dB
- Damping Factor: < 400
- Efficiency at 4-ohm: 94%
- Input Sensitivity: 6V – 0.2V
- Subsonic Filter: 10Hz – 50Hz
- Low Pass Filter: 35Hz – 250Hz
- Phase Control: 0 – 180 degrees
- Strappable Connection: Yes
- Speaker Connection: Compatible down to half an ohm
- Fusing: 400A Total (200A for each positive input)
- Clipping Indicator: Yes
- BT Remote Control: Features voltage and temperature display, along with a clipping indicator
- Power Connection for BT Remote: C-type (external battery pack or USB power required; unit does not have rechargeable batteries)
- Speaker Output: 4-gauge
- Power Inputs: 2 x 0-gauge
- Operating Voltage: 9 to 16 Volts
- Dimensions: 15.75" (L) x 9.37" (W) x 2.64" (H)
- Country of Origin: Made in South Korea
JP43 Manual
For a comprehensive guide on installation and operation, please refer to the JP43 Manual included with your purchase.
Elevate your audio experience to new heights with the Down4Sound JP43 Amplifier. Order yours today and feel the bass like never before!
Authorized Down4Sound dealer at JS Ultimate Sounds. Free shipping on orders $99+.


