TOPPING raises the Bar

Drawing on over 15 years of audio engineering experience, TOPPING created the D900 to deliver reference-grade sound with beautifully minimalist aesthetics. It debuts a proprietary 32-element PSRM module and a new I/V conversion circuit—both engineered for ultra-low noise, high-fidelity playback. It also features an independent preamp circuit and versatile input options, making it a seamless fit for computers, CD players, gaming consoles, and digital transports.

Proprietary PSRM Module

The D900 uses a discrete 1-bit PSRM decoding architecture, minimizing power supply interference while preserving signal integrity. With nanosecond-level digital switching and a purely resistive reference power supply, it achieves harmonic distortion below –140dB and an SNR of 131dB.

Proprietary I/V Conversion

TOPPING’s in-house I/V circuit uses low-distortion op-amps and ultra-low noise discrete components to maintain pristine voltage output from the PSRM stage.

Wireless Support with LDAC 

Thanks to the QCC5125 chip, the D900 supports LDAC, aptX HD, aptX Adaptive, AAC, and SBC—delivering up to 96kHz/24-bit wireless playback. Perfect for streaming from TVs, tablets, and mobile devices.

Aurora UI and Remote Control

A 2.0" full-color screen with a pressable knob and three control buttons offers intuitive navigation. Choose your background color and switch between FFT, VU meter, or playback info displays. The included remote, machined from a solid aluminum block, offers convenient full-feature control.

10-Band High Precision Parametric EQ Adjustment

Use the desktop software to fine-tune 10 frequency bands—adjust frequency, gain, and Q-factor. Save profiles for different headphones or speakers and import/export your curves.

Independent Preamp Mode

Drive active speakers or power amps directly via the dedicated preamp circuit. Volume can be adjusted in 0.5dB steps via front panel or remote. Each input/output remembers its volume setting.

Combine with A900

The D900 is built to complement the upcoming A900 headphone amp—offering matched design, premium specs, and a complementary 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: <0.000055%
• 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

Specs

D900 DAC Parameters (Line Out/USB In @ 96kHz):

• THD+N A-wt:
  • XLR (Line Out): <0.000055% @ 1kHz
  • XLR (Preamp): <0.000055% @ 1kHz
• THD @No-wt (45kBw):
  • XLR (Line Out): <0.00015% @ 20-20kHz
  • XLR (Preamp): <0.00015% @ 20-20kHz
• SNR (A-wt):
  • XLR (Line Out): 131dB @ 1kHz
  • XLR (Preamp): 131dB @ 1kHz
• Dynamic Range (A-wt):
  • XLR (Line Out): 131dB @ 1kHz
  • XLR (Preamp): 131dB @ 1kHz
• Frequency Response:
  • XLR (Line Out): 20Hz-20kHz (±0.3dB), 20Hz-40kHz (±1.0dB)
  • XLR (Preamp): 20Hz-20kHz (±0.3dB), 20Hz-40kHz (±1.0dB)
• Output Level:
  • XLR (Line Out): 4.2Vrms @ 0dBFS (4V Mode), 5.2Vrms @ 0dBFS (5V Mode)
  • XLR (Preamp): 10.5Vrms @ 0dBFS (4V Mode), 13.0Vrms @ 0dBFS (5V Mode)
• Noise (A-wt):
  • XLR (Line Out): <1.5uVrms
  • XLR (Preamp): <1.6uVrms
• Channel Crosstalk:
  • XLR (Line Out): -147dB @ 1kHz
  • XLR (Preamp): -147dB @ 1kHz
• Channel Balance:
  • XLR (Line Out): 0.3dB
  • XLR (Preamp): 0.3 dB
• Output Impedance:
  • XLR (Line Out): 100Ω
  • XLR (Preamp): 100Ω
    

Note: The above data is the result of tests in TOPPING's laboratory with an output amplitude of 5V.

What's Included

• D900 DAC
• Remote control
• USB cable
• AC cable
• Bluetooth antenna
• Product information card