The Tube Box S2 is Pro-Ject s very first product to feature a fully discreet circuit design without using any operational amplifiers (OpAmps). It also is the first product that comes with replaceable tubes for tube rolling and sound-shaping. This gives customers many options to pick from to alter the sound signature to their preference. Tube Box S2 will give a full and relaxed laid back sound with lush mids, just as you would expect from a much bigger high-end tube phono pre-amplifier. It also offers support for both MM and MC cartridges and comes with many gain settings to be switched on the front panel. The Five different variable impedance settings are available to adjust to any MM cartridge, the 47k ohm input impedance setting is fixed and suited for high output MC cartridges. The aluminium metal casing is adapted to the DS2 line in looks and protects against vibrations and electromagnetic interferences to obtain a superior sound.