Sign In

The Down4Sound JP3 CPT is a compact yet powerful Class‑D amplifier designed to deliver 555 W RMS across multiple load configurations (1 Ω, 2 Ω, and 4 Ω), making it extremely flexible (“Any‑Ohm”). This makes it ideal for small to medium subwoofer setups where space is limited but power is needed. With a rugged build, advanced filter controls, and a strap‑link option, it’s a very versatile amp for bass-focused installs.

Key Benefits

• Load Flexibility: Provides 555 W RMS at 1Ω, 2Ω, or 4Ω, so you can wire a wide range of subwoofers. 
• Strappable: Can be strapped with another JP3 CPT to double power (1110 W when two are linked). 
• Tunable Filters: Includes a low-pass filter (35–250 Hz), subsonic filter (10–50 Hz), and bass boost (0–9 dB) so you can precisely adjust your system. 
• Compact Size: Small footprint (6.29″ length) makes it easy to mount in tight spaces such as trunks, under seats, or behind panels. 
• Protection Circuitry: 4-way protection includes thermal, over/under voltage, speaker short, and DC protect for durability. 
  Liberty Bass Shop
• Remote Monitoring: Comes with a remote that displays voltage, temperature, power, protection, and clipping status. 

Technical Specifications

• Power Output (RMS):
• 1 Ω: 555 W @ 14.4 V 
• 2 Ω: 555 W @ 14.4 V 
  Liberty Bass Shop
• 4 Ω: 555 W @ 14.4 V 
• Strapped Power: 1,110 W @ 2 Ω (when two amps are linked) 
• Frequency Response: 10 Hz – 254 Hz 
• Low-Pass Filter: 35 – 250 Hz 
• Subsonic Filter: 10 – 50 Hz 
• Bass Boost: 0 – 9 dB 
• Input Sensitivity: 0.2 V – 6 V 
• Signal-to-Noise Ratio: ~93 dB 
• Total Harmonic Distortion (THD): < 0.1% (at 4 Ω) 
• Fuse Rating:
• Single Unit: 70 A 
• Strapped: 140 A 
• Dimensions: 6.29″ L × 7.40″ W × 2.24″ H 
• Weight: ~15 lb 

Installation & Compatibility

Use Case: Best suited for subwoofer systems where you need solid power but have constraints on wiring or load: 1Ω, 2Ω, or 4Ω.

Wiring: Depending on your sub(s), you can wire to match the amp’s load flexibility (DVC or SVC subs).

Power Wiring: Use 4 AWG for power and ground to ensure stable performance. 
Liberty Bass Shop

Mounting Tips: Thanks to its compact size, it can be mounted in tight spots, but ensure good ventilation because of its high-power nature.

Tuning Advice: Start with subsonic filter in the 15–30 Hz range, set the low-pass around 80–120 Hz (or per your sub), and use bass boost sparingly to avoid distortion.

FAQS

• What type of setups is the D4S JP3 amplifier best for?
  The JP3 is ideal for powering smaller to mid-sized subwoofers, delivering clean monoblock power in efficient builds.
• Is the D4S JP3 efficient for daily use?
  Yes, it’s designed for reliable daily performance with stable output and low heat.
• Does the D4S JP3 require heavy electrical upgrades?
  Basic upgrades like proper wiring and a solid battery are recommended, but full electrical overhauls are usually unnecessary.
• Can the JP3 handle low-impedance wiring?
  Yes, the JP3 is engineered to run safely at low ohm loads when installed correctly.