TOPPING A900 Ultra-Flagship Balanced Headphone Amplifier & Preamplifier

TOPPING A900 Ultra-Flagship Headphone Amplifier & Preamplifier

The TOPPING A900 is an ultra-flagship headphone amplifier engineered for listeners who demand massive power, sonic precision, and fully balanced, reference-level audio. Built around a six-channel T’ang-ku-la amplifier architecture with a patented three-stage feedback circuit, it delivers a record-breaking 151dB dynamic range, full-band THD as low as 0.00003%, and a peak output of 22,000mW x 2 @16Ω. With six headphone outputs, a dedicated pure preamp mode, a fully balanced relay volume control, and an isolated dual power supply, the A900 brings reference-grade performance to any high-end headphone or two-channel setup.

Optimized T’ang-ku-la Amplifier Architecture

At the heart of the A900 is TOPPING’s exclusive T’ang-ku-la architecture with a groundbreaking three-stage feedback circuit. This patented technology reduces circuit noise and high-frequency distortion, elevating the dynamic range to an extraordinary 151dB while bringing full-band THD down to a record-breaking 0.00003%. The design also minimizes circuit heat, improving reliability and service life while keeping thermal noise low and performance stable.

Six-Channel Fully Differential Balanced Architecture

Three T’ang-ku-la modules form a six-channel, fully differential balanced architecture that maintains pure signal integrity from source to output. This true full-link differential balanced amplification ensures unmatched clarity and separation, letting you hear every nuance in your music with a deep, silent background.

Massive Output Power for Any Headphone

With an unparalleled output power of 22,000mW x 2 @16Ω, the A900 effortlessly drives even the most demanding headphones. Whether you use high-impedance or low-impedance models, the amplifier delivers a massive range of power for precise sound reproduction at every volume level.

A Full Range of Headphone Outputs

The A900 provides up to six physical headphone outputs covering four mainstream connection standards: 6.35mm single-ended, 4.4mm balanced, 4-pin XLR balanced, and dual 3-pin balanced. Premium-grade connectors from Neutrik and Pentaconn ensure stable, reliable contact, and outputs can be configured as independent or simultaneous for flexible monitoring.

Preamp Functionality for Flagship Performance

Flip the A900 into dedicated preamp mode and use its balanced XLR outputs to feed a power amplifier or active monitors. As a preamplifier it matches the headphone amp’s flagship performance, with THD+N below 0.000055% and up to 60Vpp output, making it an ideal companion for high-end two-channel systems.

Fully Balanced Relay Volume Control

Volume is handled by a fully balanced, relay-based system with precise 0.5dB steps and channel crosstalk as low as -153dB. Every turn of the knob delivers smooth, predictable adjustments with exceptional sonic purity and separation, bringing vocals to life and revealing the finest textures in instruments.

Responsive and Intuitive Control

A 2-inch full-color display provides clear, real-time playback information. On the right, three touch-sensitive buttons work seamlessly with the volume knob for fast, intuitive adjustments, and the knob also serves as a customizable function key tailored to your preferences.

Display Modes and Themes

Switch effortlessly between multiple display modes such as playback information, FFT spectrum, or VU meter, and choose from 9 background colors to match your aesthetic. The interface gives you real-time feedback on audio performance in the style you prefer.

Premium CNC-Machined Remote Control

The included remote control is crafted from a single block of high-strength aluminum alloy using precision CNC machining, followed by fine sandblasting for a refined finish. It feels substantial, looks premium, and gives you precise control from a distance.

Isolated Power Supply for Enhanced Stability

The power supply for the digital processing circuit is physically isolated from the two analog amplification circuits, delivering more stable, reference-grade voltage and effectively reducing interference for cleaner sound reproduction.

Rear Panel Connectivity

The rear panel features high-quality Neutrik connectors with three sets of stereo combo balanced inputs, ensuring broad compatibility with professional audio equipment for both audiophiles and studio users. Balanced XLR preamp outputs, 12V trigger in/out, and a firmware upgrade port complete the connectivity picture.

Specifications

• Amplifier Architecture: Six-channel T’ang-ku-la circuit with patented three-stage feedback, fully differential balanced
• Output Power (BAL IN/BAL OUT): 22000mW x 2 @16Ω; 14000mW x 2 @32Ω; 7000mW x 2 @64Ω; 3000mW x 2 @150Ω; 1500mW x 2 @300Ω; 750mW x 2 @600Ω (THD+N<0.1%)
• Output Power (BAL IN/SE OUT): 6000mW x 2 @16Ω; 3000mW x 2 @32Ω; 1550mW x 2 @64Ω; 660mW x 2 @150Ω; 330mW x 2 @300Ω; 165mW x 2 @600Ω (THD+N<0.1%)
• THD+N @20-20kHz (90kBW): <0.00003% (BAL out, 80mW @300Ω); <0.00006% (SE out, 500mW @32Ω)
• SNR @MAX OUT 1kHz (A-wt): 151dB (balanced) / 143dB (single-ended)
• Dynamic Range @1kHz (A-wt): 151dB (balanced) / 143dB (single-ended)
• Frequency Response: 20Hz-40kHz (±0.05dB); 10Hz-200kHz (±0.1dB)
• Output Level: 60 Vpp (balanced) / 30 Vpp (single-ended), all gain settings
• AP Measured Noise (A-wt): <0.7µVrms @G=L; <1.2µVrms @G=M; <2.5µVrms @G=H (balanced)
• Channel Crosstalk (A-wt): -153dB (balanced) / -105dB (single-ended)
• Input Sensitivity: 22.0Vrms @G=L; 7.0Vrms @G=M; 2.1Vrms @G=H
• Gain: -0.1dB @G=L; +10.3dB @G=M; +19.8dB @G=H (balanced)
• Output Impedance: <0.1Ω; adapter impedance >8Ω
• Headphone Outputs: 6.35mm single-ended, 4.4mm balanced, 4-pin XLR balanced, dual 3-pin balanced
• Inputs: 3x XLR + 6.35mm TRS combo balanced inputs
• Preamp Outputs: Balanced XLR (up to 60Vpp); THD+N <0.000055% @1kHz (A-wt)
• Volume Control: Fully balanced relay-based, 0.5dB steps
• Display: 2-inch full-color display with playback info / FFT / VU modes and 9 background colors
• 12V Trigger: Input + output
• Power Supply: Isolated digital/analog supplies
• Dimensions: 33.0 x 20.0 x 5.7 cm
• Accessories: Premium CNC-machined aluminum remote control, AC cable, documentation

What's Included

• TOPPING A900 headphone amplifier
• Premium CNC-machined aluminum remote control
• AC power cable
• User manual and documentation