Topping A50s Headphone Amplifier

Topping A50s Headphone Amplifier

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Key info

The TOPPING A50s is a Ultra-High Performance NFCA modules, using the same NFCA (Nested Feedback Composite Amplifier) module from flagship A90.

All specifications

Physical characteristics
Weight 2.6 x 12.3 x 11 cm
Frequency Response 20Hz-200kHz (±0.05dB) | 20Hz-200kHz (±0.05dB)
Gain 0.0dB @G=0dB 6.0dB @G=6dB | 6.0dB @G=0dB 12.0dB @G=6dB
Outputs < 0.1Ω | < 0.2Ω

Topping-A50sUltra-High Performance

NFCA balanced modules

A50s uses the same NFCA (Nested Feedback Composite Amplifier) module from flagship A90. Voltage Current hybrid feedback architecture along with UHGF (Ultra High Gain Feedback) technology provides excellent DC and AC performance. High output current drive capability allows the amp driving low impedance headphones with ease. Ultra-low noise of 0.3uV is miles ahead of the competition, giving an absurdly high dynamic range of 144dB and no audible noise and darkest background for the most sensitive IEMs.

Full Aluminum case

A50s uses full aluminum case with unique workmanship. The outer casing is made of an aluminum brick through CNC precision machining. The outer casing is designed with thermal conductive column to dissipate heat from the power supply and OP-AMP through the entire outer casing.

6.35mm SE & 4.4mm balanced output

Although there is only a single-ended input, A50s has a built-in balanced amp circuit. Therefore, it can drive single-ended headphones by 6.35mm output, and drive balanced headphones by 4.4mm balanced output.

Wide range of adaptation to headphones

A50s has a high voltage swing of 42Vp-p, power of 3500mW per channel when both channels are driven and output impedance of less than 0.1Ohm. It easily drives power-hungry headphones with a wide range of different impedance.

2 step gain settings, adapt to various sensitivities

A50s is equipped with two gain settings of 0dB/6dB at SE output (6dB/12dB at balanced output). Wide range of gain settings and the 0.3uVrms ultra-low noise makes A50s easily adapt to all types of headphones from extremely sensitive IEMs to most power demanding full-sized over-ears.

Also an excellent preamp

The NFCA modules of A50s are not only able to drive the headphones but also apply to be a preamplifier with the same ultra-high performance. When it is in preamp mode, output impedance is as low as 20ohm, which is widely suitable for various devices.

HPA/PRE automatic switching

When the A50s is not connected to any headphones, it automatically works in the preamplifier mode, and the amplified signal is output from the RCA on the back panel. When the headphone is connected to 6.35mm or 4.4mm output, A50s automatically switches to the headphone gimp mode, and the signal is only output to the 6.35mm and 4.4mm jack.

A50s+D50s, what a exquisite combination

Work with active speakers, you will able to enjoy both headphones and speakers.

P50 could provide cleaner power to A50s

(When powered by P50, max balanced output power of A50s drop to 2.4W x 2, other power spec is not affected)


Inside in box you will receive:


15V1A adapter*1

User’s manual*1

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