AUDIOPHONICS MPA-M400ET Power Amplifier Class D Mono Purifi 1ET400A 1x400W 4 Ohm

Module PURIFI 1ET400A

The amplification circuit uses its own PURIFI 1ET400A module. This high performance Class D amplifier circuits offers a very comfortable power of 200W (@ 8Ω) while making the most of Class D amplifiers high efficiency rating.

The 1ET400A module has a >75dB high gain loop over the entire frequency band, providing high performance across the whole spectrum and surpassing any amplifier regardless of its class.

Thanks to hyper-low intermodulation distorsion (IMD) the MPA-M400ET achieves incredible precision over the whole spectrum, unmatched by audio amplifiers of any technology or operating class.

THD remains extremely low at any frequency and any power level right until clipping. This translates into a total lack of sonic signature, and an ability to reproduce any type of music without preference for genre or production style.

Power Module Hypex HYPEX SMPS600N400

SMPS600N400 switching power supply is a model with very high maximum output power of 600 Watts. It has been specifically designed and developed by Hypex to provide 2 x 65V voltage required for operation of the most demanding amplifier modules.
This low noise high quality Power supply, meets every energy needs of the amplification modules. Furthermore, the amplifier modules themselves have an excellent ability to reject power supply noise. The MPA-M400ET has lowest sensitivity to the variations of your electrical network liable to cause parasitic noise.

Audiophonics Interface Card

The amplifier module Purifi is driven by a controller module of our design.

A Texas Instrument LM4562 OPA per channel is used, these are very low distortion AOPs offering the greatest transparency with a very low THD. They are mounted on socket allowing their replacement if necessary

To suit all uses we opted for 3 gain settings, adjustable by jumper on the interface card :

Gain of + 7.2dB, for a total of 20dB (default) - Maximum power reached with a signal of ~ 4.2V RMS

Gain of + 12.5dB, for a total of 25.3dB - Maximum power reached with a signal of ~ 2.2V RMS

Bypass: in this case the signal passes directly from the inputs to the modules, allowing the lowest possible gain of 12.8dB. This mode can be interesting when using a powerful preamplifier, capable of driving a load of 2 to 4kOhm and reaching a voltage of ~ 10V RMS

Connectivity

Designed for easy integration, the MPA-M400ET has a balanced mono (XLR) and unbalanced mono (RCA) input. A bipolar selector make it easy to change the input source and even allow independent channel control when paired to another MPA.

Output side, BP-209 terminal blocks Ø5.5mm acrylic / 24K gold insulated terminal blocks ensure an excellent connection with the speakers and supporting bare cables (5.4mm), banana plugs and spades.

Specifications
Type	Power Amplifier
Output power (max)	8Ω @1%THD : 227W 4Ω @1%THD : 425W 2Ω @1%THD : 450W
THD+N	PO=1W, f=1kHz 0.0007 % PO=10W, f=1kHz 0.00026 % PO=100W, f=1kHz 0.00015 % PO=1W, f=20-20kHz 0.0007 % PO=10W, f=20-20kHz 0.00029 % PO=100W, f=20-20kHz 0.00017 %
IMD (CCIF)	PO=1W, f=18kHz+19kHz 0.00025 % PO=10W, f=18kHz+19kHz 0.00022 % PO=100W, f=18kHz+19kHz 0.00027 %
IMD (DIM)	PO=1W, DIM30 0.002 % PO=10W, DIM30 0.002 % PO=100W, DIM30 0.002 %
Idle noise	A-weighted 11.5 µV
Dynamic range	A-weighted 4Ω 131 dB
SNR	A-weighted 4Ω 131 dB
Frequency response	RL= 8Ω, f= 20-20kHz ±0.01 dB RL= 4Ω, f= 20-20kHz ±0.01 dB RL= 2Ω, f= 20-20kHz ±0.01 dB
Output impedance	1kHz, Iout=1A 0.07 mΩ 20-20kHz, Iout=1A <0.65 mΩ
Input impedance	RCA: 47kΩ / XLR: 94kΩ Bypass: 2.2kΩ / 4.4 kΩ
Power supply	AC 110 / 230V (Automatic detection of the input voltage)
Dimensions	141 x 357 x 65mm
Weight	1.8 kg
Power cable	Included

Specifications

Type

Power Amplifier

Output power (max)

8Ω @1%THD : 227W
4Ω @1%THD : 425W
2Ω @1%THD : 450W

THD+N

PO=1W, f=1kHz 0.0007 %
PO=10W, f=1kHz 0.00026 %
PO=100W, f=1kHz 0.00015 %
PO=1W, f=20-20kHz 0.0007 %
PO=10W, f=20-20kHz 0.00029 %
PO=100W, f=20-20kHz 0.00017 %

IMD (CCIF)

PO=1W, f=18kHz+19kHz 0.00025 %
PO=10W, f=18kHz+19kHz 0.00022 %
PO=100W, f=18kHz+19kHz 0.00027 %

IMD (DIM)

PO=1W, DIM30 0.002 %
PO=10W, DIM30 0.002 %
PO=100W, DIM30 0.002 %

Idle noise

A-weighted 11.5 µV

Dynamic range

A-weighted 4Ω 131 dB

SNR

A-weighted 4Ω 131 dB

Frequency response

RL= 8Ω, f= 20-20kHz ±0.01 dB
RL= 4Ω, f= 20-20kHz ±0.01 dB
RL= 2Ω, f= 20-20kHz ±0.01 dB

Output impedance

1kHz, Iout=1A 0.07 mΩ
20-20kHz, Iout=1A <0.65 mΩ

Input impedance

RCA: 47kΩ / XLR: 94kΩ
Bypass: 2.2kΩ / 4.4 kΩ

Power supply

AC 110 / 230V (Automatic detection of the input voltage)

Dimensions

141 x 357 x 65mm

Weight

1.8 kg

Power cable

Included

Input	XLR
Input	RCA
Output	Speaker terminal
Color	Black
Channel	2 (Stereo)
Class	Class D / T
Amplifier chip	Hypex Ncore
Power (W)	400.0

Unexpected
I'm having a hard time finding the words to describe how good these amps sound. They just do everything right. Period. ( powering martin logan electrostatic speakers)

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This review has been posted for AUDIOPHONICS MPA-M400ET Power Amplifier Class D Mono Purifi 1ET400A 1x400W 4 Ohm

gamechanger
As being a sound engineer and an audio enthusiast I was a bit scared when I placed the order and switching from DENON POA 6600A monoblocs to D-amps. I read a lot about them and made my research. Spent hours and hours reading and analysing data. Finally decided to go for the audiophonics MPA-M400ET set. Had to wait for a month, but what the heck. The audiophonics team gave me al the updates in this time and finally received my amps. Installed them and after an evening listening, I was so enthusiastic. It was like a totally new experience. My counterpoint tube preamp and my speakers, a DIY focal Utopia., who are hard to handle at 1,2 Ohm. They sounded so different, so clean, so spatial, it was like they were not there anymore. They disappeared in front of me. I listen to all kinds of music. I know quiet a few songs that are hard to handle for any combination of speaker/amps. And on a pretty fair volume the amps made it smooth listening. This is the amp for me that will always stay in my collection.
Thanks for the good service, the proper build and the switch to D-amps

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This review has been posted for AUDIOPHONICS MPA-M400ET Power Amplifier Class D Mono Purifi 1ET400A 1x400W 4 Ohm

Summer replacement for Accuphase Power Amplifier
These amplifiers (pair of monoblocs) have been acquired as a summer replacement for my Accuphase amplifiers which are warming my music room to extreme temperatures. Please be mindful that the review is written within first 24 hours of obtaining them and here you will find my initial thoughts which are nothing but subjective. The main concern for me will these amps have enough power to drive my B&W 802D3 speakers. The answer is YES, very much so. Both the deep bass and clear sweet midrange are exactly where they were and where I like them, Off course the treble is as expected, which is very precise. It is not too bright, it is nice. I dare say I am able to hear the decay of the cymbals or notes from piano with better detail than before. I am planning to test these amps for the next week or so and perform a detailed comparison to the Accuphase AMPs. So far so good. I am still worried that the Max power output is 227W which, as tested by ASR, give out continuous (RMS?) power of 131W. So far so good. Class D amps had a bad reputation in the past. I think that the Purify and Hypex crowd are changing the game and giving us music lovers (NOT Audiophiles - although the meaning is same) a whole new perspective on how music can be reproduces with high quality at an affordable price.

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Bon rapport qualité prix, il alimente une voie centrale Paradigm founder c90 avec brio, les voix sont claires et charpentés, tous les détails sont là. Évidemment il y a mieux mais bien plus cher. Je recommande.

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This review has been posted for AUDIOPHONICS MPA-M400ET Power Amplifier Class D Mono Purifi 1ET400A 1x400W 4 Ohm

Incredible price performance
Anyone interested in this amp has probably dealt with measurement data and ASR. Thus, you know that probably one of the best power amps in the world is offered here.
They are impeccably finished and thoughtfully assembled. The sound is mercilessly transparent and clean. I can not imagine that there will be anything better again. Especially not for this price. This is final stage endgame.

A few criticisms: the front LED can be deactivated, but I would have preferred the color red or orange here, so that it is not so annoying at night. A small instruction or parts list, at least on a small piece of paper, would have been nice. But these are both really only small things.

Translated with www.DeepL.com/Translator (free version)

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This review has been posted for AUDIOPHONICS MPA-M400ET Power Amplifier Class D Mono Purifi 1ET400A 1x400W 4 Ohm