Topping D900 / D 900 Fully discrete 1-bit PRSM Desktop DAC

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Topping Unveils their Ultra-Flagship D900 DAC, Packed with Innovative Technology to Deliver High-Fidelity Music with Ultra-Low Noise
Fully discrete 1-bit PRSM DAC architecture
Proprietary I/V conversion for higher quality audio reproduction
Independent preamp circuit
10-band high-precision PEQ
Sleek, angular design for bold aesthetic
Product Highlights
Fully discrete 1-bit PSRM DAC architecture
Self-developed I/V circuitry
SNR: 131dB; DNR: 131dB
Ultra-low jitter (-157dB)
THD+N:
10-band PEQ with desktop software
Aurora UI with full-color screen
Bluetooth 5.1 with LDAC and aptX HD
Preamp mode with volume memory
12V trigger in/out
Inputs:  USB-C, USB-B, optical, coaxial, Bluetooth, AES, or IIS-LVDS
Outputs: XLR balanced preamp, XLR balanced line out
Focus on the MusicThe D900 is Topping's all-new ultra-flagship hifi DAC, born from their relentless pursuit of ultimate sound quality. Its refined industrial design perfectly reflects Topping's music-focused philosophy.
An extensive array of digital inputs ensures broad compatibility with all your source devices. The D900 effortlessly accommodates computers, CD players, digital transports or gaming consoles. 
As a true all-rounder, an independent and dedicated preamplifier circuit expands the D900's versatility to floor standing speakers. The high-precision volume control with 0.5dB steps enables exceptionally smooth and refined adjustments.
Self-Developed PSRM ModulePSRM is a fully discrete 1-bit decoding architecture built around an ultra-high-speed switching logic array and precision voltage references. After testing more than 20 component types and configurations, Topping carefully selected a combination that delivers lightning-fast response while maintaining signal purity and minimizing interference with the power supply system.
At the heart of this design is the voltage reference power supply, which plays a critical role in determining analog output accuracy. Topping's switching logic operates at nanosecond speeds, and while this allows for rapid current regulation, it can also compromise reference voltage stability, directly impacting distortion and noise. To overcome this, they developed a purely resistive, noise-free reference power system. This innovative pairing of clean voltage regulation with high-speed logic enables the D900 to reproduce audio with stunning fidelity, achieving harmonic distortion below -140 dB and a signal-to-noise ratio of 131 dB.


Responsive ControlThe D900 is built with a 2-inch full-color display and provides real-time playback information. On the right, three touch-sensitive buttons work seamlessly with the volume knob to enable fast and intuitive adjustments. With a simple operation, you can effortlessly switch between multiple display modes, such as playback information, FFT spectrum or VU meter. The D900 also offers a choice of 9 background colors, allowing you to tailor the visual interface to your personal preferences.
Brand New I/V ConversionTopping designed a new I/V conversion circuit for the D900 with the goal of higher quality audio reproduction. It is composed of low-distortion integrated operational amplifiers and carefully selected ultra-low noise discrete components. This ensures the voltage output of the PSRM remains pristine, providing ample dynamics and an immersive sound experience.
Additional FeaturesLDAC Wireless Support
Equipped with Qualcomm's QCC5125 chip, D900 supports Bluetooth 5.1 with LDAC, aptX HD, aptX Adaptive, AAC and SBC. 
10-Band High Precision PEQ
Topping's brand new PEQ algorithm and desktop software allow you to fine-tune the frequency, gain and bandwidth or each PEQ band. Save multiple profiles, apply different EQ to your speakers + headphones and import/export curves.
Ultra-Low Jitter
Using CPLD to process the clock signal and optimize the digital signal, the D900 achieves incredible jitter rejection.
Ultra-Flagship Combo
The D900 is especially made to pair with the Topping A900 headphone amplifier. To be launched soon, the A900 will include a full range of headphone outputs and industry-leading specs.