Phono Box Ultra 500 - Official Pro-Ject Audio Systems USA

Phono Box ultra 500 is like no other phono preamplifier in its segment.

The “500” in the name as well as the general availability, worldwide limited to 500 pieces, celebrate the 500,000th Phono Box that Pro-Ject shipped in early 2018.

We took this milestone as an occasion to create a one-of-a-kind phono preamplifier: The polished chrome surface outshines every competitor in this price segment and offers undeniable aesthetics. Underneath this surface, we have used a copper body, which is known to have high qualities in protecting against high-frequency interferences. The internal design has been reworked.

We are now offering a fully discrete, OpAmp-free, design, which enabled us to realize an incredibly harmonious sound. On top of leaving out operational amplifiers, we decided to use polystyrene capacitors, which 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.

Additional information
Weight0.7 kg
Dimensions11.9 × 10.3 × 3.7 cm


  • Limited, exclusive edition of 500 pieces
  • Audiophile performance
  • Chrome surface on copper chassis
  • No operational amplifiers used
  • Audiophile-grade polystyrene capacitors
  • Precise RIAA equalisation
  • Switchable Subsonic filter –18dB @ 20Hz
  • Switchable input impedance/capacitance
  • Four adjustable gain levels
  • Outstanding sound quality
  • Handmade in Europe


  • Input impedance: 10, 100, 1k, 47k ohms / 100pF
  • Input capacitance/impedance: 100pF, 200pF, 320pF and 420pF */47kohms B
  • Input gain: 40 and 43dB B / 60 and 63dB A
  • Signal / Noise ratio MM: 85dBV (90dBV – ‘A’ weighted)
  • Signal / Noise ratio MC: 65dBV (71dBV – ‘A’ weighted)
  • THD: <0,0005% MM, < 0,004% MC
  • RIAA-equalization curve accuracy: <0,4dB / 20Hz – 20kHz
  • Subsonic filter: at 20Hz with 18dB/octave
  • Input: 1 pair RCA/phono sockets
  • Line-level output: 1 pair RCA/phono sockets
  • Power supply DC: 18V/500mA
  • Power consumption: 18V/80mA DC

A: typical for low output MC cartridges, B: typical for MM cartridges or high output MC
*Input capacitance is irrelevant for low output MC cartridges.


“The 500 has done an amazing job…I love good audio gear and Pro-Ject makes some of the best.” – John Biggs, Knapsack

“The Pro-Ject Phono Box Ultra 500 is certainly a solid choice” – Brad Moon, Forbes

“I can’t imagine something in this price imagine something in this price range delivering more” – Jeff Dorgay, ToneAudio

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