Note: If purchasing a bundle, the D900 is currently backordered until early August.

Ultra-flagship power, precision, and balance

The TOPPING A900 is an ultra-flagship headphone amplifier designed for listeners who want massive power, sonic precision, and the satisfaction of fully-balanced, reference-level audio. With a six-channel T'ang-ku-la circuit, a true differential architecture, 151dB SNR, and a peak output of 22,000mW x2 @16Ω, the A900 delivers clean, powerful sound and remarkable control over any pair of headphones or monitors.

Massive 22,000mW x2 output power

With up to 22,000mW per channel at 16Ω, the A900 has headroom for even the most demanding headphones. Thanks to the patented T’ang-ku-la architecture, it minimizes distortion, lowers heat, and reduces noise. This is pure power against a black backdrop, with THD below 0.00003% and a 151dB SNR.

T’ang-ku-la architecture

At the heart of the A900 is the patented three-stage feedback T’ang-ku-la circuit. It uses six channels of fully differential amplification to maintain balance all the way from source to output. This design cuts circuit noise and high-frequency distortion while boosting reliability and lowering thermal noise. The result is greater dynamic range, cooler operation, and a sound that stays clean and controlled.

Every headphone connection you need

The A900 offers six physical headphone outputs, including 6.35mm single-ended, 4.4mm balanced, 4-pin XLR balanced, and dual 3-pin balanced. Premium connectors from Neutrik and Pentaconn ensure tight, reliable contact. You can configure outputs as independent or simultaneous, so you can test or monitor multiple headphones without swapping cables.

Preamp mode when you want it

Flip the A900 into dedicated preamp mode and use its balanced XLR outputs to feed a power amp or monitors. You get the same flagship-level performance with THD+N below 0.000055% and up to 60Vpp output.

Smooth, balanced volume control

Volume is handled by a fully-balanced relay-based system with 0.5dB steps and channel crosstalk as low as -153dB. That means every turn of the knob gives you precise control without drift or bleed; just smooth, predictable adjustments and beautifully separated channels.

A display you’ll actually use

The A900’s 2-inch full-color display provides useful, at-a-glance info: real-time playback details, FFT spectrum, or a VU meter. You can choose from nine background colors and switch between display modes easily. On the right, three touch buttons and a responsive knob let you navigate and control settings quickly and easily.

A remote control, done right

The included remote is machined from a single block of aluminum and finished with sandblasting. It feels substantial, looks good, and gives you control at a distance.

Clean power, low noise

The A900’s power supply is physically isolated between digital and analog circuits. This keeps interference down and voltage steady, so your music stays the focus.

Product highlights

Six-channel T’ang-ku-la circuit with patented 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
Balanced relay-based volume control with 0.5dB steps
Six headphone outputs: 6.35mm, 4.4mm, 4-pin XLR, dual 3-pin XLR
Supports independent or simultaneous output configurations
Preamp mode with balanced XLR outputs
Full-color display with customizable modes and colors
Premium Neutrik and Pentaconn connectors
Isolated power supply for analog/digital circuits
Precision-machined aluminum remote control

Specs

A900 Headphone Amplifier Specifications

BAL IN/SE OUT

THD+N @1kHz A-wt:
- <0.000060% @Output=500mW (32Ω)
- <0.000055% @Output=80mW (300Ω)
THD+N @20-20kHz 90kBW:
- <0.00006% @Output=500mW (32Ω)
- <0.00005% @Output=80mW (300Ω)
SNR @MAX OUT 1kHz A-wt: 143dB
Dynamic Range @1kHz A-wt: 143dB
Frequency Response:
- 20Hz-40kHz (±0.05dB)
- 10Hz-200kHz (±0.1dB)
Output Level:
- 30 Vpp @G=L
- 30 Vpp @G=M
- 30 Vpp @G=H
AP measured noise level @A-wt:
- <0.7uVrms @G=L
- <0.9uVrms @G=M
- <1.5uVrms @G=H
Actual noise level @A-wt:
- <0.3uVrms @G=L
- <0.7uVrms @G=M
- <1.4uVrms @G=H
Channel Crosstalk @A-wt: -105dB
Input sensitivity:
- 22.0Vrms @G=L
- 7.0Vrms @G=M
- 2.1Vrms @G=H
Gain:
- -6.1dB @G=L
- +4.3dB @G=M
- +13.8dB @G=H
Output Impedance: <0.1Ω
Output Power:
- 6000mW x 2 @16Ω THD+N<0.1%
- 3000mW x 2 @32Ω THD+N<0.1%
- 1550mW x 2 @64Ω THD+N<0.1%
- 660mW x 2 @150Ω THD+N<0.1%
- 330mW x 2 @300Ω THD+N<0.1%
- 165mW x 2 @600Ω THD+N<0.1%
Adapter Impedance: >8Ω

BAL IN/BAL OUT

THD+N @1kHz A-wt:
- <0.000060% @Output=500mW (32Ω)
- <0.000055% @Output=80mW (300Ω)
THD+N @20-20kHz 90kBW:
- <0.00004% @Output=500mW (32Ω)
- <0.00003% @Output=80mW (300Ω)
SNR @MAX OUT 1kHz A-wt: 151dB
Dynamic Range @1kHz A-wt: 151dB
Frequency Response:
- 20Hz-40kHz (±0.05dB)
- 10Hz-200kHz (±0.1dB)
Output Level:
- 60 Vpp @G=L
- 60 Vpp @G=M
- 60 Vpp @G=H
AP measured noise level @A-wt:
- <0.7uVrms @G=L
- <1.2uVrms @G=M
- <2.5uVrms @G=H
Actual noise level @A-wt:
- <0.3uVrms @G=L
- <1.0uVrms @G=M
- <2.3uVrms @G=H
Channel Crosstalk @A-wt: -153dB
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
Output Impedance: <0.1Ω
Output Power:
- 22000mW x 2 @16Ω THD+N<0.1%
- 14000mW x 2 @32Ω THD+N<0.1%
- 7000mW x 2 @64Ω THD+N<0.1%
- 3000mW x 2 @150Ω THD+N<0.1%
- 1500mW x 2 @300Ω THD+N<0.1%
- 750mW x 2 @600Ω THD+N<0.1%

A900 Pre-amplifier Specifications

THD+N @1kHz A-wt: <0.000055%
THD+N @20-20kHz 90kBW: <0.00003%
SNR @MAX OUT 1kHz A-wt: 151dB
Dynamic Range @1kHz A-wt: 151dB
Frequency Response:
- 20Hz-40kHz (±0.05dB)
- 20Hz-200kHz (±0.1dB)
Output Level:
- 60 Vpp @G=L
- 60 Vpp @G=M
- 60 Vpp @G=H
Actual noise level @A-wt:
- <0.7uVrms @G=L
- <1.2uVrms @G=M
- <2.5uVrms @G=H
Channel Crosstalk @1kHz:
- <0.3uVrms @G=L
- <1.0uVrms @G=M
- <2.3uVrms @G=H
Channel Crosstalk @1kHz: -153dB
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
Output Impedance: 100Ω

What’s included

A900 headphone amplifier
Premium aluminum remote control
Packaging and documentation

TOPPING A900 Ultra-Flagship Headphone Amplifier