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Topping A Series A70 Pro Desktop Headphone Amplifier, Black

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Key Features

  • Up to 17,000mW output for headphones
  • T'ang-ku-la module uses a three-stage feedback circuit to lower noise and heat generation
  • Achieves low distortion (less than 0.00005% THD+N) for clean solo listening
  • R2R relay-based volume control for precise adjustments
  • Two gain settings to match different headphones

Topping A Series A70 Pro Desktop Headphone Amplifier, Black Overview

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The Topping A Series A70 Pro is a fully balanced headphone amplifier designed for high-performance desktop and hi-fi audio setups. Capable of up to 17,000mW output per channel at 16Ω, it drives everything from easy-going earbuds to power-hungry planar headphones. The A70 Pro also features T'ang-ku-la technology. This module improves dynamic range to 147dB while keeping noise, distortion, and heat generation low, so your music stays clear for long-term use. Combined with a newly developed ultra-low noise input stage, the A70 Pro enhances signal purity and compatibility with sources.


In terms of usage, this headphone amplifier provides more power and control than standard headphone outputs, ensuring that high-impedance or low-sensitivity headphones get the volume and detail they need. The A70 Pro supports both balanced (XLR) and single-ended (RCA) inputs, making it easy to connect to a variety of sources. For outputs, it offers a 6.35mm single-ended jack, a 4.4mm balanced jack, and a four-pin XLR, covering a wide range of headphone connections. It can also function as a preamp with both balanced (XLR) and single-ended (RCA) line outputs for integration into a hi-fi system.


Its compact dimensions make it a great fit for both headphone setups and desktop hi-fi systems, where space is limited. The 12V trigger input and output allow it to sync power on/off with other devices, reducing the hassle of managing multiple components. The full-colour display provides clear playback information and can be customised to show FFT analysis, VU meters, or other useful data at a glance.

Product Ref: 325576

Full Description

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What's in the Box?

  • Topping A70 Pro Desktop Headphone Amplifier
  • Remote control
  • AC cable
  • 6.35mm to 3.5mm adaptor
  • User manual
  • Warranty card

Specifications

Headphone Amplifier Section Specifications

THD+N @1kHz (A-wt)

Single-ended IN / Single-ended OUT <0.000065% @Output=500mW (32Ω)

<0.000055% @Output=80mW (300Ω)
Balanced IN / Single-ended OUT <0.000065% @Output=500mW (32Ω)

<0.000055% @Output=80mW (300Ω)
Single-ended IN / Balanced OUT <0.000065% @Output=500mW (32Ω)

<0.000055% @Output=80mW (300Ω)
Balanced IN / Balanced OUT <0.000065% @Output=500mW (32Ω)

<0.000055% @Output=80mW (300Ω)

THD @20-20kHz (90kBW)

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

<0.00005% @Output=80mW (300Ω)
Balanced IN / Single-ended OUT <0.00006% @Output=500mW (32Ω)

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

<0.00005% @Output=320mW (300Ω)
Balanced IN / Balanced OUT <0.00006% @Output=2000mW (32Ω)

<0.00005% @Output=320mW (300Ω)

SNR @MAX OUT 1kHz (A-wt)

Single-ended IN / Single-ended OUT 143dB
Balanced IN / Single-ended OUT 140dB
Single-ended IN / Balanced OUT 147dB
Balanced IN / Balanced OUT 142dB

Dynamic Range @1kHz (A-wt)

Single-ended IN / Single-ended OUT 143dB
Balanced IN / Single-ended OUT 140dB
Single-ended IN / Balanced OUT 147dB
Balanced IN / Balanced OUT 142dB

Frequency Response

Single-ended IN / Single-ended OUT 20Hz-40kHz(±0.05dB)
Balanced IN / Single-ended OUT 20Hz-40kHz(±0.1dB)
Single-ended IN / Balanced OUT 20Hz-40kHz(±0.05dB)
Balanced IN / Balanced OUT 20Hz-40kHz(±0.1dB)

Output Level

Single-ended IN / Single-ended OUT 28Vpp @G=L

27.6Vpp @G=H
Balanced IN / Single-ended OUT 27.2Vpp @G=L

27.6Vpp @G=H
Single-ended IN / Balanced OUT 56Vpp @G=L

54Vpp @G=H
Balanced IN / Balanced OUT 54Vpp @G=L

54Vpp @G=H

AP Measured Noise Level @A-wt

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

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

<1.0uVrms @G=H
Single-ended IN / Balanced OUT <0.9uVrms @G=L

<1.9uVrms @G=H
Balanced IN / Balanced OUT <1.9uVrms @G=L

<1.9uVrms @G=H

Actual Noise Level @A-wt

Single-ended IN / Single-ended OUT <0.2uVrms @G=L

<0.8uVrms @G=H
Balanced IN / Single-ended OUT <0.2uVrms @G=L

<0.8uVrms @G=H
Single-ended IN / Balanced OUT <0.6uVrms @G=L

<1.8uVrms @G=H
Balanced IN / Balanced OUT <0.6uVrms @G=L

<1.8uVrms @G=H

Channel Crosstalk @1kHz

Single-ended IN / Single-ended OUT -123dB
Balanced IN / Single-ended OUT -124dB
Single-ended IN / Balanced OUT -122dB
Balanced IN / Balanced OUT -133dB

Input Sensitivity

Single-ended IN 10.3Vrms @G=L, 2.0Vrms @G=H
Balanced IN 9.8Vrms @G=L, 2.0Vrms @G=H

Gain

Single-ended IN / Single-ended OUT 0dB @G=L, 13.8dB @G=H
Balanced IN / Single-ended OUT 0dB @G=L, 13.9dB @G=H
Single-ended IN / Balanced OUT 6dB @G=L, 19.8dB @G=H
Balanced IN / Balanced OUT 6dB @G=L, 19.9dB @G=H

Output Impedance

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

Output Power

Single-ended OUT 6000mW x 2 @16Ω THD+N<0.1%

3000mW x 2 @32Ω THD+N<0.1%

1550mW x 2 @64Ω THD+N<0.1%

330mW x 2 @300Ω THD+N<0.1%

165mW x 2 @600Ω THD+N<0.1%
Balanced OUT 17000mW x 2 @16Ω THD+N<0.1%

12600mW x 2 @32Ω THD+N<0.1%

6000mW x 2 @64Ω THD+N<0.1%

1370mW x 2 @300Ω THD+N<0.1%

670mW x 2 @600Ω THD+N<0.1%

Load Impedance

Single-ended IN / Single-ended OUT

Balanced IN / Single-ended OUT

Single-ended IN / Balanced OUT

Balanced IN / Balanced OUT 		>8Ω

*Note: The actual noise level is obtained by boosting the noise of the A70 pro by 40dB using a low noise amplifier in front of the APx555B then dividing the measured noise by 100 times.

 

Pre-Amplifier Section Specifications

THD+N @1kHz (A-wt)

Single-ended IN / Single-ended OUT <0.000055%
Balanced IN / Single-ended OUT <0.000055%
Single-ended IN / Balanced OUT <0.000055%
Balanced IN / Balanced OUT <0.000055%

THD @20-20kHz (90kBW)

Single-ended IN / Single-ended OUT <0.00005%
Balanced IN / Single-ended OUT <0.00005%
Single-ended IN / Balanced OUT <0.00005%
Balanced IN / Balanced OUT <0.00005%

SNR @MAX OUT 1kHz (A-wt)

Single-ended IN / Single-ended OUT 143dB
Balanced IN / Single-ended OUT 140dB
Single-ended IN / Balanced OUT 147dB
Balanced IN / Balanced OUT 142dB

Dynamic Range @1kHz (A-wt)

Single-ended IN / Single-ended OUT 143dB
Balanced IN / Single-ended OUT 140dB
Single-ended IN / Balanced OUT 147dB
Balanced IN / Balanced OUT 142dB

Frequency Response

Single-ended IN / Single-ended OUT 20Hz-40kHz(±0.05dB)
Balanced IN / Single-ended OUT 20Hz-40kHz(±0.1dB)
Single-ended IN / Balanced OUT 20Hz-40kHz(±0.05dB)
Balanced IN / Balanced OUT 20Hz-40kHz(±0.1dB)

Output Level

Single-ended IN / Single-ended OUT 28Vpp @G=L, 27.6Vpp @G=H
Balanced IN / Single-ended OUT 27.2Vpp @G=L, 27.6Vpp @G=H
Single-ended IN / Balanced OUT 56Vpp @G=L, 54Vpp @G=H
Balanced IN / Balanced OUT 54Vpp @G=L, 54Vpp @G=H

AP Measured Noise Level @A-wt

Single-ended IN / Single-ended OUT <0.7uVrms @G=L, <1.0uVrms @G=H
Balanced IN / Single-ended OUT <0.7uVrms @G=L, <1.0uVrms @G=H
Single-ended IN / Balanced OUT <0.9uVrms @G=L, <1.9uVrms @G=H
Balanced IN / Balanced OUT <0.9uVrms @G=L, <1.9uVrms @G=H

Actual Noise Level @A-wt

Single-ended IN / Single-ended OUT <0.2uVrms @G=L, <0.8uVrms @G=H
Balanced IN / Single-ended OUT <0.2uVrms @G=L, <0.8uVrms @G=H
Single-ended IN / Balanced OUT <0.6uVrms @G=L, <1.8uVrms @G=H
Balanced IN / Balanced OUT <0.6uVrms @G=L, <1.8uVrms @G=H

Channel Crosstalk @1kHz

Single-ended IN / Single-ended OUT -119dB
Balanced IN / Single-ended OUT -123dB
Single-ended IN / Balanced OUT -118dB
Balanced IN / Balanced OUT -125dB

Input Sensitivity

Single-ended IN 10.3Vrms @G=L, 2.0Vrms @G=H
Balanced IN 9.8Vrms @G=L, 2.0Vrms @G=H

Gain

Single-ended IN / Single-ended OUT 0dB @G=L, 13.8dB @G=H
Balanced IN / Single-ended OUT 0dB @G=L, 13.9dB @G=H
Single-ended IN / Balanced OUT 6dB @G=L, 19.8dB @G=H
Balanced IN / Balanced OUT 6dB @G=L, 19.9dB @G=H

Output Impedance

Single-ended OUT 50Ω
Balanced OUT 100Ω

*Note: The actual noise level is obtained by boosting the noise of A70 Pro by 40dB using a low noise amplifier in front of the APx555B then dividing the measured noise by 100 times.

 

General product information

Dimensions (including protrusions) 222 x 176 x 48 mm
Weight 1.27 kg
Power input 100-240VAC 50Hz/60Hz
Signal input 1 x BAL (Combo: XLR/6.35mm TRS)

1 x SE (RCA)

1 x EXT (For connection to extender EXT90)
Headphone amplifier output 1 x 6.35mm headphone output jack

1 x 4-PIN-XLR headphone output jack

1 x 4.4mm headphone output jack
Line Out output 1 x BAL (XLR)

1 x SE (RCA)
Other connections 12V Trigger In (3.5mm jack)

12V Trigger Out (3.5mm jack)
Display 2-inch LCD
Product code TOP-A70pro-B
EAN 6974268482677

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