OK-555 300W Power Amplifier

300W + 300W @ 8Ω | Professional 2U Rack Amplifier | Bridge / Parallel / Stereo Modes

The OK-555 is a high-performance post-stage power amplifier delivering 300W + 300W at 8Ω and up to 450W + 450W at 4Ω, designed for demanding commercial and professional audio systems.

Built with premium internal components and advanced protection systems, it delivers powerful, stable, and low-distortion performance.

Key Features

• 300W + 300W @ 8Ω

• 450W + 450W @ 4Ω

• Bridge, Parallel & Stereo modes

• High-power Sanken / Toshiba amplifier tubes

• Heavy-duty power transformer

• Large-capacity audio filter capacitors

• Efficient 2U rack-mount design

• Dual-speed low-noise cooling fan

• Advanced protection (Short circuit / Overload / High temperature / RF protection)

Specifications

• Channels: 2

• Frequency Response: 20Hz–20KHz

• Signal-to-Noise Ratio: ≥100dB

• THD: <0.05%

• Voltage Gain: 31dB

• Input Sensitivity: 0.775V / 1.4V

• Load Impedance: 4–8Ω

• Input Impedance: 20KΩ (Balanced) / 10KΩ (Unbalanced)

• Power Supply: AC220V

• Net Weight: 11.6kg

Engineered for high-output commercial applications, the OK-555 is ideal for PA systems, event setups, performance venues, and professional multi-speaker installations.