Phono Box Ultra 500 is like no other phono preamplifier in its class. Limited to 500 pieces worldwide, it celebrates the 500,000th Phono Box that Pro-Ject has manufactured and shipped. The polished chrome surface outshines every competitor in this price range and offers undeniable aesthetics. Underneath the surface, Pro-Ject has used a copper body known to have high qualities in protecting against high frequency interferences. The internal design has also been reworked to offer a fully discrete, OpAmp-less design, which enables Pro-Ject to realize an incredibly harmonious sound. On top of leaving out operational amplifiers, Pro-Ject decided to use polystyrene capacitors that significantly contribute to the high-end sound Phono Box ultra 500 offers. These capacitors are known amongst audiophiles as the holy grail for phono preamplifiers.