Our take
Topping NX3S is a portable, battery powered headphone amp that is great when the output is not totally clean or with a general low quality. It won't do wonders and magically make the signal perfect, but it will make the background cleaner and improve the clarity and bass response. Features OPA2140 + LME49720 components, ALPS potentiometer/ WIMA capacitors to provide a highly musical reproduction.
Product details
NX3s is built using high quality components, including OPA2140 and LME49720 operational amplifiers by Texas Instruments (the latter is installed in a DIP8 bracket, allowing the user for an easy swap to get a different sound signature), WIMA capacitors and ALPS potentiometer.
TI OPA2140 is a low-power JFET input amplifier that features good drift and low input bias current. The OPA2140 achieves 11-MHz unity-gain bandwidth and 20-V/µs slew rate while consuming only 1.8 mA (typical) of quiescent current. It features rail-to-rail output swing, low noise and very low offset and offset drift. Thanks to these specs, OPA2140 delivers a crisp, high fidelity sound with no distortions and background noise.
TI LME49720 is a ultra-low distortion, low noise, high slew rate operational amplifier optimized and fully specified for high performance. Combining advanced leading-edge process technology with state-of-the-art circuit design, the LME49720 audio operational amplifier delivers superior audio signal amplification for outstanding audio performance. The LME49720 combines extremely low voltage noise density (2.7nV/√Hz) with vanishingly low THD+N (0.00003%) to easily satisfy the most demanding audio applications. But if that’s not enough or a user is seeking different sound signature, the LME49720 is conveniently installed in a DIP8 bracket and can be easily swapped.
Thanks to these components Topping NX3s THD+N is less than 0.0017% at 1kHz for an output of 273MW at 300Ω or less than 0.0003% at 1kHz for an output of 50mW at 32Ω. The noise level is less than 2.5µVrms with the gain set to “low” or less than 6.5µVrms with a gain set to “high”. Finally, the SNR is higher than 120dB. These specs ensure a precise, rich and clean amplification of a wide range of headpones and earphones.
Optional bass boost and gain setting switches additionally increase NX3s versatility and allow the user to alter the sound signature of their system and drive anything from low-impedance earbuds to full-sized, power-hungry planar magnetic headphones.
Topping Audio NX3s is fitted with a 2400mAh battery that allows for at least 18 hours of music on one charge, and full charge takes only 4 hours (@ 1A)! NX3s design is clean, intuitive and user friendly. Its anodized aluminum body feels solid and the volume knob has been designed in a way that minimizes the risk of unintentional sound level adjustments.
Tech specs
| Measured | 10.7cm x 6.6cm x 1.36cm |
| Weight | 157g |
| Charging port | Micro USB |
| Charge time | < 4 hours @1A |
| Worktime on a single charge | 18 hours |
| THD+N | <0.0017% |
| SNR | > 120dB |
| Noise | <2.5uV(Low Gain), <6.5uV(High Gain) |
| Gain | 0dB/8.8dB |
| Bass | 0dB/4.0dB |
| Output Power | 545mW x 2 (32Ω); 100mW x 2 (300Ω) |
| Frequency response | 20Hz-200kHz |
| Recommended Headphone Impedance | 16-300 ohm |
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