The D50s benefits from the state-of-art sound processing thanks to Texas Instruments’ operational amplifiers that ensure a clear and lossless signal transmission. The amps are high-performance, bipolar-input audio operational amplifiers characterized by their superior sound quality, very low noise density and ultralow distortion. They offer rail-to-rail output swing which increases headroom and maximizes dynamic range. They also feature completely independent circuitry for lowest crosstalk and freedom from interactions between channels, even when overdriven or overloaded.
Well-Built and Easy to Operate
The Topping D50s is enclosed in an unibody machined from a solid block of aluminum that provides a superior mechanical strength and anti-interference ability, as well as natural passive heat radiation to prevent it from overheating.
Featuring a front panel and interface that are fool-proof, the D50s has just one button and a nifty joystick to control all its settings, including turning on/off, auto on/off, volume control, mute, input selection, screen brightness and PCM filter settings. To make it even more convenient to use, the D50s comes with a handy remote control that allows you to control the amp from the comfort of your chair. The back panel of D50s is fitted with stereo RCA output and USB, coaxial and optical inputs, as well as a Bluetooth antenna.
Specifications:
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Type: Desktop DAC
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Inputs: USB-B, optical, coaxial, Bluetooth
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Outputs: 1 x stereo RCA
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Frequency response: 20-20,000 Hz
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Max output power: 700mW x 2 @ 32 ohms, 125 mW x 2 @ 300 ohms
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Impedance: 16-300 ohms
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THD+N: <0.0003% @ 1 kHz
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SNR: 122 dB
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USB input: 1-768 kHz/16-32 bit, DSD64 - DSD512 (Native), DSD64 - DSD256 (Dop)
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Optical/coaxial input: 44.1-192 kHz/16-24 bit, DSD64 (Dop) ?
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Bluetooth input: AAC/SBC/APTX/APTX-LL/APTX-HD/LDAC
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Power supply: 5 VDC, 1A
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Includes: 1 x USB cable, 1 x DC to USB cable, 1 x Bluetooth antenna, 1 x remote control
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Dimensions: 4.7" x 4.3" x 1.0"
Topping D50s Manual 
California Prop 65