Power, precision, and balance in one package

The TOPPING A900 Ultra-Flagship Headphone Amplifier is for listeners who want all of it: massive power, low distortion, and the precision of fully-balanced, reference-grade audio. Thanks to its patented T’ang-ku-la six-channel circuit, differential architecture, and up to 22,000mW per channel at 16Ω, the A900 delivers clean, controlled sound even through the most demanding headphones or studio monitors (in preamp mode). Add a full-color display, six headphone outputs, a relay-based volume control, and a machined aluminum remote, and you’re looking at an endgame piece of gear. 

Enough power for anything you plug in

With 22,000mW x2 @16Ω, the A900 has more headroom than most headphones will need. Its patented T’ang-ku-la architecture—a three-stage feedback circuit—keeps that power clean by minimizing distortion, heat, and noise. Even at lower gains, the A900 stays remarkably quiet, with an actual noise floor below 1μVrms and a signal-to-noise ratio (SNR) as high as 151dB.

A circuit built for balance and control

The heart of the A900 is its six-channel fully differential T’ang-ku-la circuit. Fully differential means it maintains symmetry from input to output—rejecting noise, reducing crosstalk, and improving channel separation. The three-stage feedback design not only improves dynamic range but also reduces thermal noise and prolongs component life by running cooler.

Every connection, ready to go

On the front, you’ll find six headphone outputs: 6.35mm single-ended, 4.4mm balanced, 4-pin XLR balanced, and dual 3-pin XLR balanced. High-quality Neutrik and Pentaconn connectors ensure tight, reliable contact. You can configure the outputs to work independently or simultaneously—great for monitoring or testing multiple headphones without constant cable swapping.

A proper preamp when you need it

When you flip the A900 into preamp mode, it drives your power amplifier or monitors through balanced XLR outputs with the same clean performance—up to 60Vpp output with THD+N below 0.000055%.

Smooth, precise volume control

Volume adjustments are handled by a relay-based balanced volume control with 0.5dB steps. Channel crosstalk is as low as -153dB, keeping left and right signals clearly separated while giving you predictable, linear control.

A display you'll love to use

The 2-inch full-color display gives you real-time playback info, a spectrum analyzer, or a VU meter, with nine selectable background colors. Navigation is quick—three touch buttons and a solid, responsive knob handle the controls.

A remote worth its weight

The included remote is machined from a single block of aluminum, sandblasted, and finished to feel substantial in the hand. 

Product highlights

• Patented six-channel T’ang-ku-la circuit with three-stage feedback
  
• Fully balanced differential architecture
  
• 22,000mW x2 @16Ω output power
  
• THD+N <0.00003% across the band (90kBW)
• SNR/DNR up to 151dB
  
• Relay-based balanced volume control with 0.5dB steps
  
• Six headphone outputs: 6.35mm, 4.4mm, 4-pin XLR, dual 3-pin XLR
  
• Independent or simultaneous output configurations
  
• Preamp mode with balanced XLR outputs
  
• Full-color display with customizable modes and colors
  
• Neutrik and Pentaconn premium connectors
  
• Isolated power supply for analog and digital sections
  
• Precision-machined aluminum remote contro