Topping A50s | Compact Desktop Headphone Amp

Topping A50s Provides Amazing Sound Performance for the Price

• Compact headphone amplifier and preamp with balanced headphone operation
• Switchable high/low gain with up to 3.5W of output power
• Utilizes the same NFCA amplification as Topping's Flagship A90 Amp.

Ultra-High Performance NFCA Balanced Modules

AS50s 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 icc giving an absurdly high dynamic range of 144dB and no audible noise and the darkest background for the most sensitive IEMs.

Full Aluminum Case

AS50s 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.

2 Step Gain Selection

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.

Preamp Function

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.

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 amp mode, and the signal is only output to the 6.35mm and 4.4mm jack.

Specifcations

• SNR Max Output @1kHz (SE/Bal): 127dB/143dB
• Dynamic Range @1kHz: 138dB / 144dB
• Frequency Response: 20Hz-200kHz
• Peak Output Level (SE/Bal): 21V / 42V
• Channel Crosstalk @1kHz (SE/Bal): -86dB / -128dB
• Output Power (SE/Bal): 1.4W @32ohm 192mW @300ohm / 3.5Wx2@32ohm 760mW @300ohm

In the Box

• A50s Amplifier
• 15V DC Adapter
• 6.3mm to 2.5mm adapter
• User Manual
• Warranty Card