JL Audio JX250/1 250W RMS Monoblock Class AB Car Audio Subwoofer Amplifier Amp For Sale

JL Audio JX250/1 Monoblock Subwoofer AmplifierThis high-performance JL Audio JX250/1 monoblock power amplifier utilizes a rugged Class AB circuit design backed by a robust oversized toroidal transformer power supply to deliver a true 250 Watts of clean RMS power. Specifically engineered to drive subwoofer configurations, this amp features an integrated, hardwired active low-pass filter designed to strip out mid-range vocals and feed your subwoofers purely deep, impactful low-end frequencies. With built-in high-level pass-through capabilities alongside conventional low-level RCA inputs, this compact amplifier acts as an ideal upgrade solution for integrating premium aftermarket bass performance seamlessly into either factory OEM head units or advanced aftermarket stereos.

• Tested Bench Parameters & Diagnostic Metrics:
  • Electrical Efficiency Profile: Monitored under active signal bench testing under a live sub-bass load. With the input sensitivity potentiometer dialed cleanly to the 12 o\'clock position, the unit showed perfect power grid regulation, drawing 1.85 Amps at 12.0 Volts during mid-tier output baseline sweeps with zero signal clipping or distortion.
  • Audio Output Validation: Bench-tested under a live mono audio signal and sub-bass load. The amplifier delivers clear, distortion-free, and well-balanced low-end kick response with zero signal degradation or channel dropouts.
  • Input Sensitivity Potentiometer Sweep: The Input Sensitivity (Gain) dial was swept smoothly under continuous signal load from minimum up to maximum threshold, exhibiting uniform signal gain scaling, clean voltage tracking, and no static or dead spots. Potentiometer setting rests cleanly calibrated at the 12 o\'clock position.
  • Thermal & Protection Sequencing: Power sequencing operates normally. The dual LED status indicators illuminate correctly, with the green power circuit remaining completely locked and stable without triggering thermal protection faults or protection relay cycles.
• CRITICAL INSTALLATION REQUIREMENT MATRIX:
  • Wiring Requirements: Requires a minimum of 8-gauge (4-gauge recommended for long vehicle runs) oxygen-free copper (OFC) power and ground cables. Never utilize undersized or copper-clad aluminum (CCA) wiring kits.
  • Grounding Protocol: Ground cable must remain under 3 feet in total length and be bolted securely to bare, unpainted, sanded chassis metal. Do not ground to seat tracks or trim panel bolts.
  • Ohm Stability Limits: Absolute maximum stable load is 2 Ohms. Wiring subwoofers below a combined 2-Ohm load parallel configuration will overheat the final stage transistors, trigger immediate protection lockdown, and void operational warranty status.
• Defect & Diagnostics Isolation Protocol:
  • Control Panel Faceplate Oxidation: Small, isolated spots of hard surface debris/light surface rust are present on the interface panel (one spot located near the top-left area of the remote level jack, and one spot located along the baseline of the Bass Boost rotary dial).
  • Faded Text Graphics: Due to localized cleaning and historical surface wear around the lower oxidation spot, the factory screen-printed \"Bass Boost\" lettering on the faceplate shows minor fading.
• Explicit Inclusion Manifest: This listing includes (1) bare core JL Audio JX250/1 Monoblock Amplifier with complete original terminal block screws only as pictured. No original retail packaging, mounting screws, wiring harnesses, inline fuses, external wired bass level control knobs, or printed installation manuals are included in this sale.

ADDITIONAL PRODUCT SPECIFICATIONS & ITEM DETAILS:

• Brand: JL Audio
• MPN: JX250/1
• Model: JX250/1
• Type: Monoblock Subwoofer Amplifier
• Channels: 1 Channel (Monoblock)
• RMS Power Output: 160W x 1 @ 4 Ohms / 250W x 1 @ 2 Ohms
• Frequency Response: 10 Hz - 150 Hz
• Features: Onboard 12dB/Octave Low-Pass Filter, Variable Bass Boost (0 to +12dB), High-Level Inputs, RCA Low-Level Preouts
• Color: Black / Silver
• Impedance: 2 Ohm Stable Monoblock Load