75 Plus Stereo Power Amplifier – User Manual

📌 Important Notice Before Use

To ensure smooth delivery and proper setup, please check your email and platform messages regularly after purchase. If you receive any notice regarding unclear shipping address or changes in logistics policy, respond promptly so we can assist you without delay.

⚠️ Note: No power cord is included with this unit. Please prepare a compatible power cable separately.

⚡ Pure Class A Output

The A75 Plus delivers pure Class A amplification for superior sonic performance:

Stereo Output: 100W × 2 @ 8Ω | 200W × 2 @ 4Ω
Bridge Mode: 300W @ 8Ω | 600W @ 4Ω | 1200W @ 2Ω
Minimum Impedance: Can drive loads as low as 1Ω per channel (using 10 pairs of FET power tubes per channel)

🔊 Advanced Design Features

Input Stage: Self-developed fully balanced low-noise input module — expands music frequency response and enhances vocal clarity and dynamics.
Voltage Discharge: Dual parallel groups reduce input noise and improve dynamic range.
DC Stabilization: Ensures stable amplifier operation under all conditions.
Mains Isolation (220V): Effectively blocks DC components from entering the transformer, protecting your equipment.

📊 Technical Specifications

Parameter	Specification
Model	A75 Plus
Rated Continuous Output Power (20Hz–20kHz)
Stereo @ 8Ω	100W × 2
Stereo @ 4Ω	200W × 2
Stereo @ 2Ω	350W × 2
Bridge @ 8Ω	300W
Bridge @ 4Ω	600W
Bridge @ 2Ω	1200W
Frequency Response
Rated continuous output	20Hz–20kHz ±0.2dB
1W output	0.5Hz–160kHz ±3dB
Signal-to-Noise Ratio (S/N)	≥121dB (full band)
Total Harmonic Distortion (THD)	≤0.002% @ 8Ω (0.0082Ω)
Input Impedance	40kΩ (balanced) / 20kΩ (RCA)
Input Sensitivity
Rated continuous avg. output	0.87V
1W output	0.11V
Gain Attenuator	Max: -3dB / -6dB / -12dB
Corresponding Amplification Factor	28 / 25 / 22 / 16
Damping Factor	1050
Amplification Factor	28dB
Power Consumption
Static	350W
Maximum	800W
Dimensions (W × D × H)	430mm × 550mm × 225mm
Net Weight	37kg

🔌 Setup & Safety Tips

Always place the amplifier on a stable, heat-dissipating surface.
Ensure adequate ventilation around the unit (especially top and rear panels).
Do NOT block the cooling vents.
Use only high-quality, appropriately rated power cables.
Connect speakers only after confirming correct impedance and polarity.
Avoid turning the unit on/off frequently — allow it to stabilize between operations.

📬 Customer Support

For any technical assistance, shipping inquiries, or missing accessories, please contact us