AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm

Audiophonics HPA-S400ET Amplifier Class D Stereo Purifi 2x400W 4 Ohm
Class D stereo power amplifier based on two PURIFI 1ET400A modules and a HYPEX SMPS1200A400 power supply.

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Shipping date: 23-02-2024.

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AUDIOPHONICS HPA-S400ET

Power Amplifier PURIFI 1ET400A 2x400W 4 Ohm



Audiophonics HPA-S400ET: Main view


We are proud to present AUDIOPHONICS HPA-S400ET, a class D stereo power amplifier based on two PURIFI 1ET400A modules. This ready-to-use version is designed for audiophiles needing a foolproof amplification solution, with a considerable power reserve as well as impeccable linearity. The PURIFI modules are indeed among the most rigorous Class D amplification solutions on the market, with simply exceptional measured performance.

This device offers high level sound reproduction which will be suitable to drive demanding speakers, to sonorize large listening rooms or for studio applications requiring a considerable headroom without compromising on the precision and richness of the audio message.

All of the components are integrated in a sober and robust 100% Aluminum housing with openings and heatsinks to help heat dissipation. Its design also allows it to block signal interference.

Dual PURIFI 1ET400A module

  • Both channel of the amplification circuit uses its own PURIFI 1ET400A module. These high performance Class D amplifier circuits each offer a very comfortable power of 200W (@ 8Ω) while making the most of Class D amplifiers high efficiency rating.
  • The 1ET400A modules 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 HPA-S400ET achieves incredible precision on its stereophonic image 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.
  • The output noise is negligible, which allows deep silences and prevents losing details when listening at low volume.
  • The circuit benefits from a high level of rejection (PSRR) which minimizes the impact of power supply on audio performance.
  • Load-invariant frequency response and negligible output impedance enables the HPA-S400ET to drive the most demanding speakers with ease.
  • Very low idle losses and reduced electromagnetic interference (EMI). The High loop gain allows relaxed timing of the power MOSFETs without degrading audio performance.
  • The HPA-S400ET uses these amplifier modules with an interface card specially developed for optimal integration.

Power Module Hypex SMPS1200A400


The SMPS1200 switching power supply is a model with very high maximum output power of 1200 Watts. It has been specifically designed and developed by Hypex to provide 2 x 64V 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.

Audiophonics Interface Card

Both modules are driven in opposite phase, to cancel out the «Power-Supply Pumping» effect. This allows greater stability in the power supply by alternately distributing current draws on each rail, thus increasing its overall capacities.

We opted for a two stage voltage regulation in order to optimize the power supply to the OPAs and the auxiliary voltage supplied to the modules. 

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 board.

Jumper interface board

Connectivity


Designed for easy integration, the HPA-S400ET has a balanced stereo (XLR) and unbalanced (RCA) input. Bipolar selectors make it easy to change the input source and even allow independent channel control.

On output side, BP-207 Carbon / Gold 24K Ø5.5mm speaker terminals ensure excellent connection with the speakers.

A trigger module allows the amplifier to be switched on automatically from a distance. This is compatible with voltages from 5 to 12V.

This amplifier's trigger needs to be used with a mono trigger cable (sold separately).

THD+N

Frequency response

THD vs Freq

Test du Audiophonics HPA-S400ET par Audio Science Review (Amir)

The Audiophonics HPA-S400ET comes in a beautiful package with super performance to match its good looks. Yes, it builds on Purifi's excellent platform but they managed to add value without messing with its performance. The gain settings are well thought through. The whole thing is so well executed and must be a delight to our European members who can buy it locally. Having been built in France, it is also a feather in the cap of our French members. I am happy to give my strongest recommendation to Audiophonics HPA-S400ET. You have a lot of power with superb fidelity and transparency. "
Test du Audiophonics HPA-S400ET par Audio Science Review (Amir)
Specifications
TypePower Amplifier
Output power (max)8Ω @1%THD : 227W
4Ω @1%THD : 425W
2Ω @1%THD : 450W
THD+NPO=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 noiseA-weighted 11.5 µV
Dynamic rangeA-weighted 4Ω 131 dB
SNRA-weighted 4Ω 131 dB
Frequency responseRL= 8Ω, f= 20-20kHz ±0.01 dB
RL= 4Ω, f= 20-20kHz ±0.01 dB
RL= 2Ω, f= 20-20kHz ±0.01 dB
Output impedance1kHz, Iout=1A 0.07 mΩ
20-20kHz, Iout=1A <0.65 mΩ
Input impedanceRCA: 47kΩ / XLR: 94kΩ
Bypass: 2.2 / 4.4 
Power supply110V-230V (selector switch on the underside of the housing)
Dimensions413 x 322 x 60mm
Weight5.63 kg
Power cableIncluded
 
Data sheet
InputXLR
InputRCA
OutputSpeaker terminal
ColorBlack
Channel2 (Stereo)
ClassClass D / T
Amplifier chipPurifi 1ET400A
Power (W)400.0
Remote ControlNo
 
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Average votes
4.8 / 5
32 reviews
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Note :
 3/5
Date :
Super ampli mais prix injustifié
Ampli de puissance utilisé 15 jours non stop. Très bon ampli mais comparé à ses petits frères (mp500 et nc252mp) la différences n'est absolument pas probante... Pour ma part j'ai préféré le renvoyer. J'ai trouvé qu'il manquait de vie par rapport à ses prédécesseurs. Les mesures c'est une choses, l'écoute une autre à bon entendeur.
 (0)
 (0)
This review has been posted for AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm
Note :
 5/5
Date :
Excellent Amp!
Purchased the HPA-S400ET as alternative to my Parasound HALO INT 5. I am running Magneplanar LRS+ speakers and felt the extra power may deliver an even better sound than the HALO. This is exactly what happened! Paticularly in the mid and high tonal area the clarity was outstanding. I was very happy with my HALO but am now pleased I went for the PURIFY Amp. Excellent delivery service and product quality from Audiophonics!
 (0)
 (0)
This review has been posted for AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm
Note :
 5/5
Date :
Great value
This amp delivers insane value for money. It will likely surpass many amps that cost much, much more. The sound is incredible clean with black background and sounds very smooth and liquid. This is an end game amp.
 (0)
 (0)
This review has been posted for AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm
Note :
 5/5
Date :
Hello,
I am fully satisfied - great powerful amp, fast delivery, top performance, better than my previous ML 431!
 (0)
 (0)
This review has been posted for AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm
Note :
 5/5
Date :
Eviter les box internet à proximité....
je veux juste signaler que cet amplificateur est sensible au bruit que peut générer une box internet située à proximité. J'avais installé la mienne sur l'étagère située juste au dessus de celle de l'ampli. Conséquence un ronflement périodique très audible dans le canal droit, atténué dans l'autre.
Problème résolu en éloignant la box internet (1 mètre suffit), ce qui au passage laisse augurer une médiocrité de conception et/ou de construction de cette dernière.
Laurent G.
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 (0)
This review has been posted for AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm
 
AUDIOPHONICS HPA-S400ET Power Amplifier Class D Stereo Purifi 1ET400A 2x400W 4 Ohm
Class D stereo power amplifier based on two PURIFI 1ET400A modules and a HYPEX SMPS1200A400 power supply.

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