JBL X4 Power Amplifier

The JBL X4 Power Amplifier is designed for professional-grade sound reinforcement, delivering clean, distortion-free power across multiple speaker impedances. With advanced circuitry, multiple working modes, and robust protection features, it ensures stability, reliability, and exceptional audio clarity for demanding environments.

Key Features

• High-Power Output

  • Amplifies input audio without distortion.

  • Drives multiple speaker impedances at any volume.

  • Provides stability and strength for professional sound reproduction.

• Optimized Sound Quality

  • Maintains flat frequency response from 20 Hz – 20 kHz.

  • Eliminates switching noise and dead zones.

  • Pushes harmonic noise beyond human hearing range.

• Flexible Operation Modes

  • Supports Stereo, Parallel, and Bridge modes.

  • Built-in proprietary circuit design for consistent performance.

• User-Friendly Controls

  • 2 gain control knobs.

  • 1 power switch + standby LED.

  • 2 sets of 8 indicator lights (working, signal, clipping, protection).

• Comprehensive Protection

  • Short-circuit, overload, overheat, peak limit, DC, and soft-start protection.

  • Ensures stable and reliable operation even in demanding conditions.

• Efficient Cooling

  • Strong internal fan with convection airflow.

  • Quick temperature adjustments with built-in thermal protection.

Technical Specifications

Power Output (1 kHz, 0.5% THD):

• 4 Ω Stereo (per channel): 600W

• 8 Ω Stereo (per channel): 400W

• 8 Ω Bridge: 1200W

• 4 Ω Stereo (continuous, 1 min+): 500W

• 8 Ω Bridge (continuous, 1 min+): 1000W

Performance:

• Frequency Response: 20 Hz – 20 kHz (+0/–1 dB)

• THD: < 0.5% (20 Hz – 20 kHz)

• IMD (60 Hz/7 kHz, 4:1): < 0.35%

• Slew Rate: > 15V/µs

• Voltage Gain: 37 dB

• Damping Factor (8 Ω, 10 Hz – 400 Hz): > 250

• S/N Ratio (20 Hz – 20 kHz, A-weighted): > 100 dB

• Crosstalk (1 kHz / 20 kHz): 20 kΩ / 10 kΩ

• Input Sensitivity (8 Ω, rated): 0.775V

• Input Impedance: Balanced 20 kΩ / Unbalanced 10 kΩ

Structure & Protection:

• Peak limiting, DC, overcurrent, short-circuit, and overheat protection.

• Soft-start function to prevent surge impact.

Cooling System:

• Forced-air cooling with strong internal fan.

• Quick thermal adjustment and temperature protection.

Dimensions & Weight:

• Size: 19″ x 3.5″ x 14.9″ (483 mm x 89 mm x 378 mm)

• Net Weight: 13.5 kg

• Transport Weight: 15 kg