Ultrasone ProLine 2500

RudiStor NX-02 Sistema Headphone Amp, Ultrasone ProLine 2500 Headphones

RudiStor NX-02 Sistema Headphone Amp, Ultrasone ProLine 2500 Headphones

In this day and time where most new music listeners develop their tastes by way of ear buds, it’s been nice to see resurgence in the desire for quality headphones. Having grown up in a time when self-paced lessons included wearing plastic headsets that had the comfort level of vise grips, its always pleasant to put on a comfortable pair of “cans” and push those painful memories deeper in the grey matter of distant memories. Recently, I received an email offering me the possibility of reviewing a “Sistema”, a very peculiar audio combination, something that could be called “a Dynamic Headphone System”. It is an amp/ headphone combo. From one side the amp made by RudiStor, a small Italian based company, and maker of some of the most highly regarded headphone amplifiers available (including electrostatic ones). They teamed together with Ultrasone, the German headphone manufacturer (another European based company) and designed an amp specifically tuned for the Ultrasone’s PROLines 2500 open-air headphones.


  • Rudistor NX-02
  • Maximum Output (Voltage Swing): 17Vpp
  • Slew Rate >4VuSec
  • Bandwidth: 0-100.000 Hz 0.05db
  • Output Impedance: 0.01 Ohm to 1200
  • THD: 0.002% (3Vpp on 32 Ohm)
  • Gain: 14dB
  • Input Impedance: 47 Kohm Technology: IC and Bipolar Discrete Input : RCA golden
  • S/N: 115db
  • Output: 2 * jack full size
  • Dimensions (cm): 24*30*7
  • Humm Level: Not measurable
  • Weight (Kg): 4.0
  • Price $ Not yet announced.
  • Ultrasone ProLine 2500
  • S-Logic™ Natural Surround Sound
  • Dynamic principle
  • Frequency range 8-35.000 Hz
  • Impedance 40 Ohm
  • Sound pressure level 94 dB
  • MU Metal bufferboard, reduced field emissions in accordance with ULE standard
  • Driver 40 mm titanium-plated
  • Weight 292 g (without cord)
  • Price $399

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