P452 Purifi Amplifier

The P452 is March Audio's first Purifi based stereo amplifier. This simply elegant product is milled from solid aluminium with a tough anodized treatment. Exceptional fit, finish and build quality.


Featuring the new Purifi 1ET400A technology and Bruno Putzeys' development of his previous Hypex nCore designs, the P452 delivers extraordinary low noise and distortion with further improved refinement in subjective audio quality.

The class leading technical performance delivers a neutral but captivating musical sound that will suit the finest partnering equipment.  Fully 2 ohm capable with ultra low output impedance, the P452 can deliver up to 450 Watts and 25 Amps ensuring tremendous grip and drive even with the most challenging of speaker loads.

The OPA1612 differential input buffer has been designed to extract the maximum performance from the 1ET400A module. Featuring very low noise LT3045/94 voltage regulators which also power the analogue sections of the 1ET400A.  The digital section of the 1ET400A is powered from a separate regulator.  Careful attention to board layout and component selection ensures lowest noise and distortion levels.

The P452 features touch power switch, balanced Neutrik XLR inputs (compatible with single ended RCA)*, and heavy duty solid copper gold plated ETI Research speaker binding posts (Upgradeable to ETI Research Tellurium Copper Silver Plated Kryo Speaker Binding Posts).  High quality Canare speaker cable and Mogami signal cable is used internally providing the best signal integrity and shielding. Input RF filters ensure freedom from intermodulation.  Suitable for use directly driven from high quality DACs or Pre-Amplifiers.

Hand built and individually tested, the P452 is backed up with a 3 year warranty.


  • Power Output Per Channel

    • 2 Ohms - 450 W 

    • 4 Ohms - 425 W 

    • 8 Ohms - 227 W 

  • Current Output - 25 Amps

  • THD+N 0.00017% / -115dB  (at 100 Watts RMS 4 Ohm Load)

  • Output Noise - 18uV

  • Signal To Noise Ratio - 131 dB(A)

  • Output Impedance - 70 uOhms

  • Input Impedance 20 kOhms

  • Audio Input RF Filter

  • ETI Research Solid Copper Gold Plated BP20C Speaker Binding Posts

    • Upgradeable to ETI Research Tellurium Copper Silver Plated Kryo Speaker Binding Posts​

  • 12 Volt Trigger Input

  • Frequency Response - 10Hz to 60kHz (+0/-3dB)

  • Voltage Gain - Selectable options on ordering page

    • 26.5dB - Best suited for 2 volt single ended RCA sources

    • 20.5dB - Best suited for 4 volt balanced XLR sources

  • Dimensions (w)360mm x (d)200mm** x (h)85mm***

* requires XLR to RCA adaptor cable

** includes speaker posts

*** includes feet