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The Down4Sound JP33 is a monoblock Class‑D amplifier designed for serious bass systems, delivering up to 3,300 W RMS at 1 Ω. Engineered for high-output subwoofers, the JP33 packs massive power while maintaining control and reliability. Its dual 0-gauge power/ground inputs and advanced protection circuitry make it a powerhouse for competitive or high-demand SPL builds.

Key Benefits

• Massive Power Output: Tested at 14.4 V with 1% THD, the JP33 delivers 3,300 W RMS @ 1 Ω, 2,300 W @ 2 Ω, and 1,200 W @ 4 Ω. 
• Tuning Flexibility: Features a variable low‑pass filter (35–250 Hz), subsonic filter (10–50 Hz), and phase control (0–180°) for precise optimization. 
• Remote Control: Includes a Bluetooth remote knob that shows voltage, temperature, and clipping status, allowing real-time adjustments. 
• Strappable Design: Can be linked (strapped) with another JP33 for even more output. 
• Robust Connectivity: Dual 0-gauge power/ground inputs and a 4 GA speaker output ensure stable and heavy-duty wiring. 
• High Protection Measures: 4-way protection (thermal, over-/under-voltage, speaker short, DC) keeps the amp safe in demanding setups. 
• Always-On Cooling: Internal cooling fan activates immediately to maintain performance under load. 

Technical Specifications

• Power Output (Rated @ 14.4V / 1% THD):
• 1 Ω: 3,300 W RMS 
• 2 Ω: 2,300 W RMS 
• 4 Ω: 1,200 W RMS 
• Frequency Response: 14 Hz – 260 Hz 
• Signal-to-Noise Ratio: 96 dB 
• Damping Factor: > 300 
• Input Sensitivity: 6 V – 0.2 V 
• Subsonic Filter: 10 Hz – 50 Hz 
• Low-Pass Filter: 35 Hz – 250 Hz 
• Phase Adjustment: 0° – 180° 
• Protection: Thermal, over/under voltage, speaker short, DC 
• Strappable: Yes 
• Fusing: 350 A total (175 A x 2) 
• Operating Voltage: 9 to 16 V 
• Physical Dimensions & Weight
• Dimensions: 13.80″L × 9.37″W × 2.63″H 
• Origin: Made in South Korea 

Installation & Compatibility

Electrical Requirements: To use the JP33 safely and maintain warranty, a full electrical upgrade is required — including the Big 3, an upgraded alternator, and reserve battery(s). 

Wiring Tips: Use 0-gauge power and ground cables. Use 4-gauge for the speaker terminal.

Tuning Advice: Set the subsonic filter to around 15–30 Hz, low-pass filter around 80–120 Hz, and adjust phase for best punch.

Cooling: Mount the amp where airflow can reach the internal fan; ensure it’s not enclosed in a tight, heat‑trapping space.

FAQS

• What is the Down4Sound JP33 designed for?
  The JP33 is a compact monoblock amp built for delivering strong, clean bass. Its efficient design helps subs perform with tight, controlled power while maintaining safe operating temperatures.
• How does the JP33 compare to larger JP amplifiers?
  The JP33 offers impressive output without needing major electrical upgrades. Bigger models deliver more wattage, but the JP33 hits a sweet spot for daily bass without excessive draw.
• What electrical upgrades help the JP33 run better?
  A quality AGM battery, Big 3 upgrade, and proper OFC wiring ensure stable voltage. These improvements help the amplifier maintain clean power during heavy bass notes.
• Can the JP33 run dual subwoofers?
  Yes—if wired to the correct final impedance the amp supports. Proper wiring ensures balanced output, prevents overheating, and protects both the amplifier and subs."