Like new, lightly used Topping NX4, DSD dac. I used this as a dac connected to my PC, but it also works well connected to a phone or headphones.

Topping DSD NX4 Compact DAC/AMPEXCELLENT REVIEWS! WELL REVIEWED!The Topping NX4 DSD is a compact DAC/Amp that is easilyportable and can be used with laptops or smartphones. It has the SabreES9038Q2M DAC and XU208 USB bridge that supports high-res audio that includes32 bit/768 kHz, DSD256 (DoP), and DSD512 (native). The amp provides 28 hours ofplayback, while the DAC and amp together provide 7.5 hours of playback.SPECS:- 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), >7.5hrs (USB DAC mode)- Power LED: Blue light (lights red to indicate low battery)- Charge LED: Light red when charging, light green whencharge is complete- DAC LED: Blue means valid connection and playing PCMformat, red means playing DSD formatAMP:-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 mWx 2 at 300 ohms, THD+N <1%- Adapter impedance: 16–300 ohmsDAC- 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

Topping NX4 DSD headphone DAC/amp in original box with original accessories. Works perfectly.

This Topping NX4 DSD portable DAC amp for headphones is a game-changer for all music lovers out there! Offering high-quality sound and amazing performance, this sleek and stylish device is perfect for those who are always on-the-go. Great battery life and portability. Have barely used this and it is in great condition! Tech specs: Input range micro-USB: 16 – 32 bit / 44.1 – 384 kHz PCM, DSD64/128/256 as DoP, DSD 512 native 3.5 mm jack (when used as amplifier only) Suitable headphones impedance16 – 300 ? Output impedance< 0.4 ? Maximum output power: 293 mW (32 ?), 114 mW (300 ?) Frequency response: 20 – 100,000 Hz (± 0.55 dB) THD+N (@1 kHz) < 0.0009% (32 ?, 1 kHz, 140 mW) < 0.0037% (32 ?, 20 – 20,000 Hz, 140 mW) < 0.00046% (300 ?, 1 kHz, 57 mW) < 0.0005% (300 ?, 20 – 20,000 Hz, 57 mW) SNR> 120 dB Crosstalk-96 dB

Topping NX4 DSD Headphone Amp DAC Portable Rechargeable with Line Output.

Topping NX4 DSD Headphone Amp DAC Portable Rechargeable with Line Output Used only a handful of times! PCM768, DSD512DSD: Native,DOPAnalog input: 1 x 3.5mm (share with analog output)Analog output: 1 x 3.5mm (share with analog input)Headphone output: 1 x 3.5mmPlayback time: Approx 28 hours (only headphone amp)Playback time: Approx 7.5 hours (USB DAC + headphone amp)Headphone output: 293mWDistortion: 0.0009% (140mW)Noise floor: 2.5uV 6.5uV293mW x 2 @ 32?114mW x 2 @ 300?Decoding SNR: 119dB16-32bit / 44.1-768kHZ DSD64-DSD256Dop DSD64-512 (native)Net weight: Approx 155g (unit only)Dimensions: Approx 11cm x 6.8cm x 1.4cmSuitable Headphone Impedance: 16-300?