Topping D900 Discrete DAC

Topping introduces its flagship D900 DAC, brimming with advanced technologies for ultra-high-fidelity audio and exceptionally low noise

• Fully discrete 1-bit PRSM DAC design
• Proprietary I/V conversion for enhanced sound reproduction
• Dedicated independent preamp circuit
• High-precision 10-band PEQ
• Striking, modern angular design

Topping’s D900 stands as their brand-new flagship DAC, engineered from the ground up in pursuit of the highest possible audio performance. Its refined, modern aesthetic underscores Topping’s unwavering focus on musical excellence.
Equipped with an extensive range of digital inputs, the D900 seamlessly connects to computers, CD players, digital transports, or gaming systems, ensuring versatile integration into any setup.

Thanks to its dedicated preamplifier stage, the D900 effortlessly pairs with active monitors or floorstanding speakers, while its precise 0.5 dB step volume control provides smooth and meticulous level adjustments.

PROPRIETARY PSRM TECHNOLOGY

At the core of the D900 lies Topping’s self-developed PSRM architecture, a fully discrete 1-bit decoding system built around an ultra-high-speed switching logic network and precision voltage references. Topping tested over 20 different components and configurations before arriving at the optimal combination, achieving ultra-fast signal handling without compromising purity or power supply stability.

The voltage reference power supply plays a vital role in preserving analog output accuracy. Although the high-speed switching logic enables rapid current regulation, it can threaten the stability of reference voltages, introducing noise and distortion. To solve this, Topping engineered a purely resistive, noise-free reference system. This innovative pairing of clean voltage regulation with high-speed logic empowers the D900 to deliver extraordinary sound quality, boasting harmonic distortion below -140 dB and a signal-to-noise ratio of 131 dB.

INTUITIVE INTERFACE

A vibrant 2-inch full-color screen provides real-time playback data, complemented by three touch-sensitive buttons and a multifunction volume knob for fast, intuitive control. Users can effortlessly switch among various display modes, including playback info, FFT spectrum analysis, or VU meters. Customization is further enhanced with a choice of nine background colors to personalize the visual interface.

NEW I/V CONVERSION DESIGN

Topping has engineered a new I/V conversion circuit exclusively for the D900, focusing on achieving superior audio fidelity. This stage uses low-distortion op-amps and meticulously chosen ultra-low noise discrete components, ensuring the PSRM’s voltage output stays exceptionally clean and dynamic, delivering a truly immersive listening experience.

LDAC WIRELESS CAPABILITY

With Qualcomm’s QCC5125 chip on board, the D900 supports Bluetooth 5.1 and high-resolution wireless codecs including LDAC, aptX HD, aptX Adaptive, AAC, and SBC.

ADVANCED 10-BAND PEQ

Topping’s newly developed PEQ system and companion desktop software let you precisely adjust frequency, gain, and bandwidth for each of the 10 EQ bands. Users can save multiple custom profiles, apply different EQ settings for speakers and headphones, and easily import or export EQ curves.

EXTREMELY LOW JITTER

By utilizing a CPLD to manage clock processing and optimize the digital signal flow, the D900 achieves exceptionally low jitter levels, ensuring pristine digital performance.

ULTIMATE FLAGSHIP PARTNER

The D900 is specifically designed to match with Topping’s upcoming A900 headphone amplifier. The forthcoming A900 will offer comprehensive headphone output options and industry-leading specifications for an ultra-high-end combo.

INCLUDED ACCESSORIES

• Topping D900 DAC
• User manual
• Remote control
• USB cable
• Power cable
• Bluetooth antenna

KEY SPECIFICATIONS

• DAC Chip: Proprietary PSRM architecture
• Bluetooth Chip: Qualcomm QCC5125
• Clock Processing: Altera Max II CPLD

Inputs:

• 1× USB-C
• 1× USB-B
• 2× Coaxial
• 2× Toslink optical
• 1× AES/EBU
• 1× I2S via HDMI

Bluetooth Version: 5.1
Supported Bluetooth Codecs: SBC, AAC, aptX, aptX-HD, aptX Adaptive, LDAC

Outputs:

• 1× XLR line output
• 1× XLR preamp output

Supported Sampling Rates:

• PCM up to 32-bit / 768 kHz
• DSD up to DSD512

Additional Features:

• DAC and preamplifier functions
• 10-band equalizer
• Full-color display with Aurora UI
• In/out trigger connections

XLR LINE OUTPUT SPECS

• THD+N (A-weighted): < 0.000055% @ 1 kHz
• THD (No weighting, 45 kHz bandwidth): < 0.00015% @ 20 Hz – 20 kHz
• SNR (A-weighted): 131 dB @ 1 kHz
• Dynamic Range (A-weighted): 131 dB @ 1 kHz
• Frequency Response:
  • 20 Hz – 20 kHz (+/- 0.3 dB)
  • 20 Hz – 40 kHz (+/- 1.0 dB)
• Output Level:
  • 4.2 Vrms @ 0 dBFS (4V mode)
  • 5.2 Vrms @ 0 dBFS (5V mode)
• Noise (A-weighted): < 1.5 μVrms
• Channel Crosstalk: -147 dB @ 1 kHz
• Channel Balance: 0.3 dB
• Output Impedance: 100 ohms