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        1ET400A 1x425W Eigentakt Amplifier Module

        1ET400A 1x425W Eigentakt Amplifier Module


        PURIFI 1ET400A 1x425W Eigentakt Amplifier Module

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        Brand: PURIFI
        € 272,69€ 329,95 6 In stock
        • -5% Purchase 2 for only € 313,45 per piece
        • -10% Purchase 4 for only € 296,96 per piece

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        • Ordered now, shipped on Monday
        • At least two years warranty
        • 45-day cooling-off period to return
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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 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 ...

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        By dipoluser on 4 April 2022
        1ET400A 1x425W Eigentakt Amplifier Module
        € 272,69
        € 329,95
        1ET400A 1x425W Eigentakt Amplifier Module
        6 In stock
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