This is an Apos Certified product. That means it's refurbished, like new, eligible for our 45-day return policy, carries an Apos Certified One-Year Warranty, and ships from our US facility. Currently, Apos Certified products are only available to customers with a US shipping address. We appreciate your understanding as we aspire to expand our offerings to a broader audience in the future.

Back and better than ever

Meet the third generation of the TOPPING A50 series, the A50 III Desktop Headphone Amp, which builds on the foundation of its predecessors to deliver an even better audio experience. This generation boasts a THD+N of less than 0.00006%, a dynamic range over 144dB, and an impressive output of 3500mW x 2 @32Ω. Featuring the NFCA (Nested Feedback Composite Amplifier) module and a 3-step gain switch, the A50 III drives a wide range of headphones and IEMs with world-class clarity.

Ultra-high performance in every note

The heart of the A50 III is the advanced NFCA (Nested Feedback Composite Amplifier) module, shared with its predecessor, the A50s. This cutting-edge technology ensures stellar DC and AC performance, driving even low-impedance headphones without breaking a sweat. 

Robust machined aluminum shell

Precision is key in the creation of the A50 III, which boasts a machined shell meticulously carved from a solid block of aluminum. This process not only offers superior electromagnetic shielding, but provides a smooth, refined look and exceptional strength.

Putting the “I/O” in audio 

Offering both 6.35mm single-ended and 4.4mm balanced headphone jacks, alongside RCA and TRS inputs, the A50 III adapts seamlessly to your audio setup. Its versatile connection options ensure you can easily switch between input and output combinations, however you like to listen. 

Calling all cans and IEMs

With three gain settings and an ultra-low noise floor, the A50 III caters to any headphone, from sensitive IEMs to power-hungry over-ears. Its robust output ensures your music always sounds its best, free from distortion even at peak levels.

Purely powerful

Featuring a powerful output of 3500mW x2 @32Ω, the A50 III guarantees your headphones reach their full potential. Combined with its low distortion rate, this amp delivers clean, powerful sound that stays true to the original recording.

Synchronized and simplified 

The 12V trigger output allows the A50 III to power on and off in sync with your other devices, including its perfect match, the D50 III. 

Product highlights

• NFCA module for superior sound quality
• CNC unibody design for durability and electromagnetic shielding
• Multiple input and output options for versatile connectivity
• Three gain settings to accommodate all types of headphones
• Powerful output of 3500mW x2 ensures wide compatibility
• Low distortion for clear, detailed sound
• 12V trigger for synchronized operation with other devices

Specs

• Maximum specs (see photos for full specs)
• THD+N @1kHz (A-wt): <0.00006% 
• THD @20-20kHz 90kBW: <0.0001%
• SNR @Max Out 1kHz A-wt: 144dB 
• Dynamic range @1kHz A-wt: 144dB 
• Frequency response: 20Hz - 40kHz (±0.1dB) / 10Hz - 100kHz (±0.5dB)
• Output level: 
• Low gain: 21Vpp
• Medium gain: 21Vpp
• High gain: 21Vpp
• AP measured noise level @A-wt
• Low gain: <0.7uVrms
• Medium gain: <0.7uVrms
• High gain: <1.1uVrms 
• Actual noise level @A-wt
• Low gain: <0.3uVrms
• Medium gain: <0.3uVrms
• High gain: <1.0uVrms
• Input sensitivity
• Low gain: 9.2Vrms
• Medium gain: 8Vrms
• High gain: 1.9Vrms 
• Gain
• Low gain: -12dB
• Medium gain: 0dB
• High gain: 11.7dB
• Output impedance: <0.2Ω
• Input impedance
• Low gain: 2kΩ
• Medium gain: 2kΩ
• High gain: 2kΩ
• Output power
• 3500mW x2 @32Ω THD+N<0.1% 
• Load impedance: >8Ω 

What’s included

• TOPPING A50 III
• 15V DC adapter
• 6.35 to 3.5mm adapter
• Product information card