Topping NX4 DSD DAC/Amp

Headphone Amplifier

• THD+N (A-weighted): <0.0009% at 1 kHz output = 140 mW (32 ohms), <0.0037% at 20 Hz–20 kHz output = 140 mW (32 ohms), <0.00046% at 1 kHz output = 57 mW (300 ohms), <0.0005% at 20 Hz–20 kHz output = 57 mW (300 ohms)
• SNR (A-weighted): >120 dB at 1 kHz
• Frequency response: 20 Hz–100 kHz (+/- 0.55 dB)
• Output level: 8.3 Vpp at 32 ohms gain = L, bass = off; 16.4 Vpp at 300 ohms gain = L, bass = off 
• Noise: <2.5 uVrms at gain = L, <6.4 uVrms at gain = H
• Channel crosstalk: -96 dB at 1 kHz
• Channel balance: 0.038 dB
• IMD CCIF: -100 dB at 300 ohms, -94 dB at 32 ohms, CCIF (19.5 k/1k)
• IMD SMPTE: -103 dB at 300 ohms, -96 dB at 32 ohms, SMPTE4:1; -108 dB at 300 ohms, -98 dB at 32 ohms, SMPTE1:1
• Output impedance: <0.4 ohms
• Gain: 0 dB / 8.8 dB
• Bass: 0 dB / 0.4 dB (70 Hz)
• Output power: 293 dB x 2 at 32 ohms, THD+N <1%; 114 mW x 2 at 300 ohms, THD+N <1%
• Adapter impedance: 16–300 ohms

DAC (Line Out)

• Compatible: 44.1–768 kHz / 16–32 bit, DSD 64–256 (DoP), DSD 64–512 (native)
• THD+N (A-weighted): <0.0008% at 1 kHz
• SNR (A-weighted): >119 dB at 1 kHz
• Frequency response: 20 Hz–20 kHz (+/- 0.041 dB)
• Output level: 2 Vrms at 0 dBFS
• Noise: <2.2 uVrms
• Channel crosstalk: -108 dB at 1 kHz

Physical

• Power input: DC 5V/1.5A (PC’s USB 0.5A is okay)
• Line in/out: 3.5mm
• Headphone output: 3.5mm
• USB DAC input: Micro-USB
• Battery capacity: 2,400 mAh
• Charge time: <4 hrs
• Playback time: >28 hrs (headphone amp mode), >7.5 hrs (USB DAC mode)
• Power LED: Blue light (lights red to indicate low battery)
• Charge LED: Light red when charging, light green when charge is complete
• DAC LED: Blue means valid connection and playing PCM format, red means playing DSD format
• Dimensions: 4.3 x 2.7 x 0.6 in (11 x 6.8 x 1.4 cm)
• Weight: 5.2 oz (148 g)

• Micro-USB to NX4 DSD 
• Type-C to NX4 DSD Cable
• Rubber pad
• USB charging cable
• 3.5mm cable
• Rubber band
• Velcro feet
• User manual