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Topping A Series A50 III Desktop Headphone Amplifier, Silver

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Colour: Silver

Key Features

  • High output for demanding headphones
  • Uses the same NFCA module as the A50s, improving low-noise performance
  • Features 4.4mm and 6.35mm headphone outputs, as well as TRS and RCA in
  • Three-stage gain selection, low, mid, and high, provide flexibility for different headphones
  • 12V trigger for integration with your desktop hi-fi system

Topping A Series A50 III Desktop Headphone Amplifier, Silver Overview

View this description in German

The Topping A Series A50 III puts high-quality headphone amplification directly on your desktop, delivering clean and powerful audio for solo listening—all at an attractive price point. It features the same NFCA (Nested Feedback Composite Amplifier) technology originally used in the flagship A90D Headphone Amplifier, which is a module designed to deliver ultra-low noise levels (0.3uVrms) and a high dynamic range of 144dB, making it ideal for both low- and high-impedance headphones.


With both balanced 4.4mm and single-ended 6.35mm headphone outputs, as well as RCA and TRS balanced inputs, the A50 III gives you flexible connectivity options. It also features three-stage gain selection, compared to the A50S' two. These are low, medium, and high, letting you match the amplifier's output to your headphones' needs. Whether you're using sensitive in-ear monitors or power-hungry planar magnetic headphones, you can adjust the gain to achieve improved performance without unwanted noise or distortion.


With a CNC-machined aluminium chassis, the A50 III offers excellent electromagnetic shielding and a sleek build that fits neatly into any setup. Its 3500mW balanced outputs provide plenty of headroom for demanding headphones, while the 12V trigger input allows it to power on and off in sync with other compatible devices, such as its recommended pairing, the Topping D50 III DAC. This makes it a convenient and powerful choice for both desktop and high-fidelity setups.

Product Ref: 325575

Full Description

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What’s in the Box?

  • Topping A50 III Headphone Amplifier
  • 15V DC adaptor
  • 6.35 to 3.5mm adaptor
  • Product information card

Specifications

THD+N @1kHz A-wt

Single-ended IN / Single-ended OUT <0.00006% @Output=500mW(32Ω)

<0.00006% @Output=80mW(300Ω)
Balanced IN / Single-ended OUT <0.00007% @Output=500mW(32Ω)

<0.00006% @Output=80mW(300Ω)
Single-ended IN / Balanced OUT <0.00007% @Output=2000mW(32Ω)

<0.00006% @Output=320mW(300Ω)
Balanced IN / Balanced OUT <0.00012% @Output=2000mW(32Ω)

<0.00008% @Output=320mW(300Ω)

THD @20-20kHz 90kBW

Single-ended IN / Single-ended OUT <0.0002% @Output=500mW (32Ω)

<0.0001% @Output=80mW(300Ω)
Balanced IN / Single-ended OUT <0.0005% @Output=500mW (32Ω)

<0.0003% @Output=80mW(300Ω)
Single-ended IN / Balanced OUT <0.0002% @Output=2000mW(32Ω)

<0.0001% @Output=320mW(300Ω)
Balanced IN / Balanced OUT <0.0002% @Output=2000mW(32Ω)

<0.0001% @Output=320mW(300Ω)

SNR @MAX OUT 1kHz A-wt

Single-ended IN / Single-ended OUT 141dB
Balanced IN / Single-ended OUT 136dB
Single-ended IN / Balanced OUT 144dB
Balanced IN / Balanced OUT 137dB

Dynamic Range @1kHz A-wt

Single-ended IN / Single-ended OUT 141dB
Balanced IN / Single-ended OUT 136dB
Single-ended IN / Balanced OUT 144dB
Balanced IN / Balanced OUT 137dB

Frequency Response

Single-ended IN / Single-ended OUT 20Hz-40kHz(±0.05dB)

10Hz-100kHz(±0.1dB)
Balanced IN / Single-ended OUT 20Hz-40kHz(±0.1dB)

10Hz-100kHz(±0.5dB)
Single-ended IN / Balanced OUT 20Hz-40kHz(±0.05dB)

10Hz-100kHz(±0.1dB)
Balanced IN / Balanced OUT 20Hz-40kHz(±0.05dB)

10Hz-100kHz(±0.1dB)

Output Level

Single-ended IN / Single-ended OUT 21Vpp @G=L

21Vpp @G=M

21Vpp @G=H
Balanced IN / Single-ended OUT 21Vpp @G=L

21Vpp @G=M

21Vpp @G=H
Single-ended IN / Balanced OUT 18Vpp @G=L

42Vpp @G=M

42Vpp @G=H
Balanced IN / Balanced OUT 18Vpp @G=L

42Vpp @G=M

42Vpp @G=H

AP Measured Noise Level @A-wt

Single-ended IN / Single-ended OUT <0.7uVrms @G=L

<0.7uVrms @G=M

<1.1uVrms @G=H
Balanced IN / Single-ended OUT <0.7uVrms @G=L

<0.7uVrms @G=M

<1.1uVrms @G=H
Single-ended IN / Balanced OUT <0.9uVrms @G=L

<0.9uVrms @G=M

<2.1uVrms @G=H
Balanced IN / Balanced OUT <0.9uVrms @G=L

<0.9uVrms @G=M

<2.1uVrms @G=H

Actual Noise Level @A-wt

Single-ended IN / Single-ended OUT <0.3uVrms @G=L

<0.3uVrms @G=M

<1.0uVrms @G=H
Balanced IN / Single-ended OUT <0.3uVrms @G=L

<0.3uVrms @G=M

<1.0uVrms @G=H
Single-ended IN / Balanced OUT <0.7uVrms @G=L

<0.7uVrms @G=M

<2.0uVrms @G=H
Balanced IN / Balanced OUT <0.7uVrms @G=L

<0.7uVrms @G=M

<2.0uVrms @G=H

Input Sensitivity

Single-ended IN / Single-ended OUT 13Vrms @G=L

8.0Vrms @G=M

1.9Vrms @G=H
Balanced IN / Single-ended OUT 9.2Vrms @G=L

8.0Vrms @G=M

1.9Vrms @G=H
Single-ended IN / Balanced OUT 13Vrms @G=L

7.8Vrms @G=M

1.9Vrms @G=H
Balanced IN / Balanced OUT 9.2Vrms @G=L

7.8Vrms @G=M

1.9Vrms @G=H

Gain

Single-ended IN / Single-ended OUT -12.0dB @G=L

0dB @G=M

11.9dB @G=H
Balanced IN / Single-ended OUT -12.0dB @G=L

0dB @G=M

11.7dB @G=H
Single-ended IN / Balanced OUT -6.0dB @G=L

6.0dB @G=M

17.9dB @G=H
Balanced IN / Balanced OUT -6.0dB @G=L

6.0dB @G=M

17.9dB @G=H

Input Impedance

Single-ended IN 10.0kΩ @G=L

2.5kΩ @G=M

2.5kΩ @G=H
Balanced IN 2.0kΩ @G=L

2.0kΩ @G=M

2.0kΩ @G=H

Output Impedance

Single-ended OUT <0.1Ω
Balanced OUT <0.2Ω

Output Power

Single-ended OUT 2150mW x 2 @16Ω THD+N <0.1%

1400mW x 2 @32Ω THD+N <0.1%

190mW x 2 @300Ω THD+N <0.1%

100mW x 2 @600Ω THD+N <0.1%
Balanced OUT 3500mW x 2 @32Ω THD+N <0.1%

2700mW x 2 @64Ω THD+N <0.1%

760mW x 2 @300Ω THD+N <0.1%

395mW x 2 @600Ω THD+N <0.1%

Load Impedance

Single-ended IN / Single-ended OUT

Balanced IN / Single-ended OUT

Singled-ended IN / Balanced OUT

Balanced IN / Balanced OUT 		>8Ω

Product Information

Dimensions (including protrusions) 125 x 140 x 26 mm
Weight 495g
Power input DC 15V/1A @DC base 5.5*2.1
Signal input 1 x TRS (L+R)

1 x RCA (L+R)
Headphone amplifier output 1 x 6.35mm headphone output jack

1 x 4.4mm headphone output jack
Other connectors 12V trigger in (3.5mm jack)

Type-C FW port
Gain Three types (H/M/L)
Standby power consumption <0.3W
Product code TOP-A50MK3-S
EAN 6974268483650

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