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      PURIFI 1ET400A 1x425W Eigentakt Amplifier Module

      € 272,69€ 329,95 Out of stock
      • -5% Order 2 for only € 313,45 per piece
      • -10% Order 4 for only € 296,96 per piece

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      Product description

      The 1ET400A is a single-channel, ultra-high performance, analog-input Class D amplifier module capable of over 400W of power and provides an audio quality level that sets the standard for power amplifiers of any operating class.



      • Single-channel, analog input
      • Negligible THD and IMD
      • Extraordinary low noise
      • Load-invariant response
      • Exceptionally clean clipping
      • Low losses & high efficiency
      • Small formfactor 


      Product details

      PURIFI 1ET400A | Eigentakt | Amplifier Module


      This high-performance amplifier module is based on the Eigentakt technology from PURIFI. The 1ET400A is one of the most high-end options from our amplifier module category. Eigentakt is the implementation of PURIFI's continuing research into nonlinear control theory that produced the first mathematically exact largesignal model of self-oscillating amplifier controllers. This breakthrough allows complete optimization of the feedback circuit and improves performance by at least an order of magnitude over existing implementations. The Eigentakt technology allows for extreme low THD at any frequency and power level. The negligible IMD (intermodulation distortion) creates a highly resolved and stable stereo image. Thanks to the very low output noise, this exceptional performance is preserved even at low listening levels.


      The 1ET400A also features a comprehensive protection system that makes it robust and easy to integrate. 



      • High loop gain (>75dB) in the entire audio band
      • Negligible Intermodulation Distortion (IMD)
      • THD remains extremely low at any frequency and any power level
      • Negligible output noise
      • High power supply rejection ratio (PSRR)
      • Controlled, second-order low-pass response


      What’s In The Box?

      • 1ET400A amplifier module 


      The 1ET400A module requires attention on the power supply and signal input connections. We recommend to use a dedicated front-end module that provides a buffered input and handles the power supply connections. PURIFI developed the FE02 stereo front-end module for this purpose. This module enables an evaluation setup but is also suitable for DIY applications. The FE02 front-end module is supplied with the PURIFI EVAL1 kit available on this page.

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      Article number
      Rated power output

      425 watts at 4 ohms
      227 watts at 8 ohms
      450 watts at 2 ohms

      Minimum load
      2 ohms
      > 94%
      Signal-to-noise ratio (SNR)
      131 dB
      0.00017 % THD+N at 20-20,000 Hz, 4 ohms, 100 watts
      Frequency response
      0 - 60,000 Hz
      12.8 dB
      Input sensitivity
      Input impedance

      4.4k ohms (differential mode)
      2.2k ohms (common mode)

      Amplifier Classification
      Class D
      Circuit Topology
      Speaker output channels
      Input connection type
      Pin header
      Speaker output connection type
      Pin header
      DSP function
      EQ Adjustment
      Power Requirements
      25 - 70 VDC (symmetric supply +/-)
      Power inlet connector
      Pin header
      Current limit
      25 A
      Under/over voltage protection
      Dimensions (L x W x H)
      82 x 63 x 35 mm
      Mounting hole spacing
      75 x 56 mm
      Mounting hole diameter

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      5 from 5Based on 1 reviews
      Review this product
      5 of 5
      2 x 4 1ET400A, die an DIY Buffer- und Spannungsversorgungplatinen (+-12V und 5V, extrem rauscharm) betrieben werden, erhalten die Musikdaten über zwei Hypex dlcp und einem Streamer der Fa. Auralic. Dieser Aufbau steht im Class-D-Vergleich zu 2 x 4 Ncore400-Einheiten. Beide Systeme treiben die selben 4-Wege DIY Open Baffle Lautsprecher sequentiell (durch umstecken) an. Auffällig ist, dass die Bühne mit den Purifi 1ET400A noch tiefer und breiter wirkt, als das mit den Hypex Ncore400 Modulen der Fall ist. Weiterhin begeistert die Purifi-Einheit durch mehr Transparenz der Musikinstrumente und Stimmen. Die Hypex Ncore400 sind schon extrem gut, die Purifi 1ET400A lassen die Musikreproduktion noch brillianter erscheinen.
      By dipoluser on 4 April 2022
      1ET400A 1x425W Eigentakt Amplifier Module
      € 272,69
      € 329,95
      1ET400A 1x425W Eigentakt Amplifier Module
      Out of stock
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