Topping A900 Headphone Amplifier + Preamplifier

Topping A900 Headphone Amplifier

The Topping A900 is a top-tier flagship headphone amplifier engineered with outstanding technical precision. Built around three T’ang-ku-la amplifier modules, it uses a six-channel, fully balanced design that achieves an incredible 151 dB of dynamic range and an exceptionally low distortion level of just 0.00003%. Thanks to its newly designed circuitry, the A900 delivers up to 22,000 mW of output power at 16 ohms, providing enough strength to drive even high-impedance headphones or desktop speakers with ease.

Encased in a finely CNC-machined aluminum chassis, the A900 keeps its digital and analog power sections physically separated to minimize interference and enhance overall stability. On the front panel, users will find XLR 4-pin, 4.4 mm balanced, and 6.35 mm balanced outputs, all using high-quality Neutrik and Pentaconn connectors. The two-inch color screen displays playback information, FFT spectrum, and VU meter modes. Operation is made convenient through a sleek, premium remote control. Additionally, 12V trigger inputs and outputs enable synchronized control when used within a larger audio setup.

The A900 is ideal for audiophiles, recording professionals, and serious music enthusiasts who seek uncompromising sound performance. Its pure preamplifier mode allows seamless integration not only with headphones but also with speaker systems, making it a perfect core component in any high-end audio chain. It pairs beautifully with the Topping D900 DAC. The amplifier comes in a refined silver finish and includes a remote control, a 6.35 mm to 3.5 mm adapter, and a power cable.

Specifications

Inputs

3 × Combo XLR (balanced) / 6.35 mm jack (single-ended)

Outputs

2 × Combo XLR (balanced) / 6.35 mm jack (single-ended) headphone output

2 × Balanced XLR 4-pin headphone output

2 × Balanced 4.4 mm headphone output

1 × Balanced XLR pre-out

Headphone Amplifier

Balanced input / Single-ended output | Balanced input / Balanced output

THD+N @ 1kHz, A-wt:

< 0.00006% @ 500mW, 32Ω

< 0.000055% @ 80mW, 300Ω | < 0.00006% @ 500mW, 32Ω

< 0.000055% @ 80mW, 300Ω

THD+N @ 20-20kHz, 90kBW:

< 0.00006% @ 500mW, 32Ω

< 0.00005% @ 80mW, 300Ω | < 0.00004% @ 500mW, 32Ω

< 0.00003% @ 80mW, 300Ω

SNR @ Max output, 1kHz, A-wt: 143 dB | 151 dB

Dynamic range @ 1kHz, A-wt: 143 dB | 151 dB

Frequency response:

20 Hz–40 kHz (±0.05 dB)

10 Hz–200 kHz (±0.1 dB) | 20 Hz–40 kHz (±0.05 dB)

10 Hz–200 kHz (±0.1 dB)

Output level:

30 Vpp @ G=L

30 Vpp @ G=M

30 Vpp @ G=H | 60 Vpp @ G=L

60 Vpp @ G=M

60 Vpp @ G=H

Audio Precision noise level (A-wt):

< 0.7 µVrms @ G=L

< 0.9 µVrms @ G=M

< 1.5 µVrms @ G=H | < 0.7 µVrms @ G=L

< 1.2 µVrms @ G=M

< 2.5 µVrms @ G=H

Effective noise level (A-wt):

< 0.3 µVrms @ G=L

< 0.7 µVrms @ G=M

< 1.4 µVrms @ G=H | < 0.3 µVrms @ G=L

< 1.0 µVrms @ G=M

< 2.3 µVrms @ G=H

Crosstalk (A-wt): -105 dB | -153 dB

Input sensitivity:

22.0 Vrms @ G=L

7.0 Vrms @ G=M

2.1 Vrms @ G=H | 22.0 Vrms @ G=L

7.0 Vrms @ G=M

2.1 Vrms @ G=H

Gain:

-6.1 dB @ G=L

+4.3 dB @ G=M

+13.8 dB @ G=H | -0.1 dB @ G=L

+10.3 dB @ G=M

+19.8 dB @ G=H

Output impedance: < 0.1Ω | < 0.1Ω

Output power:

2 × 6000 mW @ 16Ω, THD+N <0.1%

2 × 3000 mW @ 32Ω, THD+N <0.1%

2 × 1550 mW @ 64Ω, THD+N <0.1%

2 × 660 mW @ 150Ω, THD+N <0.1%

2 × 330 mW @ 300Ω, THD+N <0.1%

2 × 165 mW @ 600Ω, THD+N <0.1% | 2 × 22000 mW @ 16Ω, THD+N <0.1%

2 × 14000 mW @ 32Ω, THD+N <0.1%

2 × 7000 mW @ 64Ω, THD+N <0.1%

2 × 3000 mW @ 150Ω, THD+N <0.1%

2 × 1500 mW @ 300Ω, THD+N <0.1%

2 × 750 mW @ 600Ω, THD+N <0.1%

Adapter impedance: > 8Ω

Preamplifier

THD+N @ 1kHz, A-wt: < 0.000055%

THD+N @ 1kHz, A-wt: < 0.00003%

SNR @ Max output, 1kHz, A-wt: 151 dB

Dynamic range @ 1kHz, A-wt: 151 dB

Frequency response:

20 Hz–40 kHz (±0.05 dB)

20 Hz–200 kHz (±0.1 dB)

Output level:

60 Vpp @ G=L

60 Vpp @ G=M

60 Vpp @ G=H

Audio Precision noise level (A-wt):

< 0.7 µVrms @ G=L

< 1.2 µVrms @ G=M

< 2.5 µVrms @ G=H

Effective noise level (A-wt):

< 0.3 µVrms @ G=L

< 1.0 µVrms @ G=M

< 2.3 µVrms @ G=H

Crosstalk: -153 dB

Input sensitivity:

22.0 Vrms @ G=L

7.0 Vrms @ G=M

2.1 Vrms @ G=H

Gain:

-0.1 dB @ G=L

+10.3 dB @ G=M

+19.8 dB @ G=H

Output impedance: 100Ω

General

Dimensions (W × D × H): 33 × 20 × 5.7 cm

Package contents:

1 × Topping A900 headphone amplifier

1 × Remote control

1 × Power cable