The Topping NX7 Portable DAC & Headphone Amplifier is adaptable compact & high performing ideal for boosting a variety of headphone types. The NX7 offers 3 individual step gain settings an output power of 18m W under a load of 300ohms & low distortion levels that send clean audio signals. The NFCA modules provide 135d B SNR & low power consumption to enable a long battery life. This power amplifier is perfect for sensitive IEMs & full-sized headphones. The NX7 amplifier supplies a low gain of -13.8d B & background noise of