The NX1s is a high-performance, compact headphone amplifier that is compact enough to be secured to your mobile device and still be stored in your pocket. Topping went above and beyond designing a compact amplifier that would be perfect for the audiophile on the go, and the NX1s was the result. The case is engineered to not allow the volume knob to be mistakenly moved in a pocket or purse. The NX1s also features two switches on the rear of the unit, one of which controls the amplifier gain, and the other switch allows the user to toggle the bass boost level. The signal input on the NX1s is a 3.5 mm input on the front of the unit, next to that is the 3.5 mm headphone output.

Specifications: • Maximum output power: 150 mW x 2 (RL=32?, THD+N=1%) • Headphone impedance: 16-300? • Input: 3.5 mm • Output: 3.5 mm • Frequency response: 20 Hz-100 kHz • SNR: 117 dB (RL=300?, Gain=0 dB) • Dimensions: 3.3" x 2.2" x 0.4".