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.

Highlights:

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. 

Features:

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.

Specifications:

Article number: 1ET400A

Rated power output:

425 watts at 4 ohms

227 watts at 8 ohms

450 watts at 2 ohms

Minimum load: 2 ohms

Efficiency: > 94%

Signal-to-noise ratio (SNR): 131 dB

Distortion: 0.00017 % THD+N at 20-20,000 Hz, 4 ohms, 100 watts

Frequency response: 0 - 60,000 Hz

Gain: 12.8 dB

Input sensitivity: -

Input impedance:

4.4k ohms (differential mode)

2.2k ohms (common mode)

Amplifier Classification: Class D

Circuit Topology: Eigentakt

Speaker output channels: 1

Input connection type: Pin header

Speaker output connection type: Pin header

DSP function: -

Bluetooth: -

EQ Adjustment: -

Power Requirements: 25 - 70 VDC (symmetric supply +/-)

Power inlet connector: Pin header

Current limit: 25 A

Under/over voltage protection: Yes

Dimensions (L x W x H): 82 x 63 x 35 mm

Mounting hole spacing: 75 x 56 mm

Mounting hole diameter: M3