CHUBAN A9.4 Audiophile-Grade Dual-Channel Class A Pure Power Amplifier with RCA XLR Inputs: 100W/8 Ohms, 200W/4 Ohms

2014: First Generation T9 Launched

2024: Launch of the Latest Transsion Class A Flagship Master Edition A9.4 Amplifier

Circuit Features

Fully symmetrical X-Amp ultra-fast power amplification circuit

Fully DC-coupled circuit

Signal can be balanced or single-ended input

Features high damping, capable of driving all low-sensitivity large speakers

Delivers a precise sound: high resolution, first-class control, and exceptional low frequencies

Design and Materials

Extra-large, heavy-duty chassis, 430mm wide, 430mm deep, and 230mm high (including feet). Heatsink area is 29.5% larger than the previous generation.

Two 600W Nippon Steel transformers, one for each channel.

Eight 10000uF audio electrolytic capacitors per channel.

Completely independent design for left and right channels; amplifier board, power board, and protection board are all completely separate for each channel.

Seven pairs of precision-matched genuine Japanese-made Sanken tubes per channel. High quiescent current, 300mA per tube

Comprehensive speaker protection, effectively protecting your expensive speakers

Features soft start and DC power filtering

Shute power socket and gold fuse

Shengyun high-quality binding posts

Shengyun RCA signal connectors

All-unit single-crystal copper signal cables

Uses American ALPHA solder wire

Specifications

Input Sensitivity: 1.12Vrms

Input Impedance: 33K ohms

Damping Factor: 2000

Output Power: 100W/8 ohms, 200W/4 ohms RMS power, stable full-power output over extended periods

Quick Power Consumption: 220W

Power Supply Voltage: AC110V or AC220V

Chassis Color: All silver or all black

Weight: 32kg (including packaging)

Dimensions: 430*430*230mm

AP Test Parameters Test data per channel with 8 ohms and 800W load:

Output RMS: 30.0Vrms

Channel Gain: 28.5dB (26.8x)

Residual Noise: 25.28uV

Signal-to-Noise Ratio: 121.4dB

Dynamic Range: 121.4dB

THD Distortion: 0.000398%

THD+N Distortion: 0.0015%

Frequency Response Bandwidth: ±0.064dB

Quality Assurance

To ensure quality, every unit undergoes comprehensive AP testing to ensure it meets design specifications.

Tests include: bandwidth, noise (signal-to-noise ratio), dynamic range, distortion, intermodulation distortion, channel separation, amplification, etc.

72-hour stress test on the entire unit, 1-hour stress test at full 8-ohm amplifier load, and over 1 hour of listening practice.

Using 8 high-end terminals, it can be double-line split sound.

The following picture shows the A9.4 standard version, which uses 16 ELNA for Audio audio-specific electrolysis.

A9.4  BC capacitor version   uses 16 Vishay BC, 056 series audiophile audio filter electrolytic capacitors

A9.4 Class A amplifier AP test data with 8Ω 800W resistor