AUDIOPHONICS HPA-Q400ET Amplificateur 4 voies Class D Purifi 4x400W 4 Ohm

AUDIOPHONICS HPA-Q400ET Amplificateur 4 voies Class D Purifi 4x400W 4 Ohm
We are proud to present AUDIOPHONICS HPA-SQ00ET, a class D 4 way power amplifier based on 4x PURIFI 1ET400A modules.

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This device is supplied as standard in 230V. If you need 110V input voltage, please specify it clearly in the comment field when ordering.


Power Amplifier PURIFI 4x400W 4 Ohm

Audiophonics HPA-Q400ET Amplificateur 4 Voies Class D Purifi 4x400W 4 Ohm

We are proud to present AUDIOPHONICS HPA-SQ00ET, a class D 4 way power amplifier based on 4x PURIFI 1ET400A modules. This ready-to-use version is designed for audiophiles and home-cinema lovers in need of 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.

4xPURIFI 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-Q400ET achieves incredible precision on its spatialisation 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-Q400ET 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.

Dual 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 regulation with two voltage levels in order to optimize the power supply to the PDOs and the auxiliary voltage supplied to the modules. This allows the OPAs to be powered with a high voltage (18V) for better overall performance, and allows them in turn to provide the voltage needed to reach the amplifier's maximum output level. While still maintaining the auxiliary voltage required by the modules.

Each channel uses its own Texas Intruments LM4562 AOP. bringing precision and musicality. They are mounted on a socket allowing their possible replacement.

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


Efficient and versatile HPA-Q400ET Purifi amplifier has four inputs XLR connector with four pairs of speaker output terminals. It thus covers all cases, listening to high-fidelity home theater multi-purpose through bi-amplification.


Frequency response

THD vs Freq

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 supply230V (110V on request)
Dimensions413 x 322 x 60mm
Weight5.63 kg
Data sheet
OutputSpeaker terminal
ClassClass D / T
amplifier chipPurifi 1ET400A
Maw power (W)400.0
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Average votes
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Parfait pour la multiamplification
les modules purifi sont ce qui se fait de mieux avec les modules Ncore 40à en classe D.
Cet ampli ne chauffe pas (essayé en stéréo 2 voies uniquement) et est très transparent. Seul regret , pas d'entrée RCA (mais il n'y a pas trop la place à l'arrière, il est vrai)
This review has been posted for AUDIOPHONICS HPA-Q400ET Amplificateur 4 voies Class D Purifi 4x400W 4 Ohm
AUDIOPHONICS HPA-Q400ET Amplificateur 4 voies Class D Purifi 4x400W 4 Ohm
We are proud to present AUDIOPHONICS HPA-SQ00ET, a class D 4 way power amplifier based on 4x PURIFI 1ET400A modules.

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