A50s Headphone Amplifier 3500mWx2 Computer Cellphone Audio Enthusiasts HiFi Preamplifier Silver

A50s Headphone Amplifier 3500mWx2 Computer Cellphone Audio Enthusiasts HiFi Preamplifier Silver

Advantages:
- Used as a headphone amp or preamplifier
- 4.4mm balanced output
- 0dB, 6dB gain settings
- NFCA amplifier circuit
- THD+N ＜0.00007%
- Dynamic range 144dB
- Noise ＜0.3uVrms*
- Output impedance ＜0.1Ω
- Output power 3500mWx2

Attention:
- Since the noise is much lower than the bottom noise of audio analyzer APX555B, this parameter is measured by indirect measurement method, which is to amplify the noise by 100 times and divide the reading by 100.

Features:
- NFCA circuit. A50s uses the same NFCA (Nested Feedback Composite Amplifier) circuit from flagship A90. Using voltage and current hybrid feedback architecture and UHGF (Ultra High Gain Feedback) technology, it provides very good DC performance and very low distortion. The powerful output current capability provides sufficient protection for driving low-resistance headphones. 0.3uV is far lower than the low noise of the entire industry, providing 144dB dynamic range and noise level that the most sensitive headphones can't hear.
- SINAD 125dB at 1KHz. Dynamic range 144dB at 1KHz.
- 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 columns to dissipate heat from power supply and op amp through the entire outer casing.
- For single-ended and 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.
- Can drive high resistance or low resistance headphones. A50s achieves multiple elements required for an ideal headphone amplifier at the same time: a high output amplitude of 42Vpp, an output power of 3500mW per channel, and a low output resistance of less than 0.1Ω. It can easily drive high resistance or low resistance headphones.
- A50s has two gain options: 0dB, 6dB (balanced output is 6dB, 12dB). With a wide range of gain coverage and low noise of 0.3uVrms, satisfactory results can be obtained whether it is large headphones or high-sensitivity IEMs.
- A50s can not only drive headphones. When used as a pre-amplifier, it can also exert the same excellent performance. When used as a pre-amplifier, its output impedance is only 20Ω, which is widely adapted to various other equipment.
- Headphone amplifier/preamplifier switch automatically. When the A50s is not connected to any headphones, it is in preamp mode, and the amplified signal is output from the RCA interface on the back. When the earphone is connected from any interface, A50s automatically switches to headphone amplifier mode, and signals are only output from the earphone interface.
- It can be used with D50s Bluetooth DAC. Can be used with active speakers. Users can listen to music from headphones or speakers.
- A50s can be powered by P50 for a purer power supply. When using P50 power supply, the maximum balanced output power is 2.4Wx2, and the other parameters will not be reduced.

Front Panel Introduction (From Left To Right):
Power Switch/Gain Selection
Gain Indicator (It will flash when the headphone amp outputs abnormally)
6.35MM Headphone Jack
4.4MM Balanced Headphone Jack
Volume Knob

Rear Panel Introduction (From Left To Right):
R in: Line In RCA Right Channel
L in: Line In RCA Left Channel
R out: Pre OUT RCA Right Channel
L out: Pre OUT RCA Left Channel
DC15V: Power Supply Input

Package Included:
- 1 x Set of A50s

Note:
- It is assembled and ready to use.