The Pre Box S2 packs in enough connections to suit a very healthy small hi-fi system, perfect for desktop or bookshelf. It features three rear-panel line level inputs consisting of two pairs of RCA jacks and a separate 3.5 mm minijack input that's ideal for connecting to your phone, tablet, or other portable device. Three individual analog signals can be passed on to a power amplifier, such as Pro-Ject's Amp Box S2 or other Pro-Ject Box Design power amplifiers, via the RCA pre-output. A fixed line level signal can be relied to a further amplifier such as Head Box S2 via the 3.5mm output. The incredibly low harmonic distortion levels deliver a listening experience which is difficult to equal in this price range. The noise floor is and extremely low -105dB (A weighted), while THD + Noise comes in at a vanishingly low 0.0005%. The housing is made of an aluminum/metal sandwich construction for highest aesthetics and to protect against unwanted electromagnetic interference and vibration. Pre Box S2 Analog comes in silver or black and can be powered by any 5V power-bank or the included power supply. A 12V trigger output can remotely turn on other products with trigger input for improved comfort and convenience. Frequency response: 20Hz - 80kHz, Noise floor: -105dB (A weighted), THD+N: 0.0005%, Gain: 8.5dB, Output voltage (typical): 1V at 1kHz, Input impedance: 15k ohms, Outboard power supply: 5V/500mA DC, Standby power consumption: