AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm

AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
We are proud to offer you the Audiophonics LPA-S400ET, a Class D stereo power amplifier based on two Purifi 1ET400A modules. This ready-built and ready-to-use version is for audiophiles who want to equip themselves with a foolproof amplification solution, with a considerable power reserve as well as a perfect linearity. PURIFI modules are among the most rigorous Class D amplification solutions on the market, with simply outstanding measured performance.

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

Audiophonics LPA-S400ET

Class D Stereo Amplifier Purifi 2x400W 4 Ohm

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

We are proud to offer you the Audiophonics LPA-S400ET, a Class D stereo power amplifier based on two Purifi 1ET400A modules. Similar electronically to the HPA-S400ET, this version is mounted in a more compact box making it easier to use in an environment where space is limited, its architecture also limits the length of the internal connections.

This ready-built and ready-to-use version is for audiophiles who want to equip themselves with a foolproof amplification solution, with a considerable power reserve as well as a perfect definition. PURIFI modules are among the most rigorous Class D amplification solutions on the market, with simply outstanding measured performance.

The package offers a high level of sound reproduction suitable for use with demanding loudspeakers, for large listening rooms or for studio applications requiring a large headroom without compromising on the accuracy and richness of the audio message.

All the components are integrated in a 100% Aluminium housing that is sober, robust, design and compact. This one has openings in order to facilitate heat dissipation. Its design also allows it to limit the impact of interference on the signal.

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

Two PURIFI 1ET400A modules

  • Each channel of the amplifier circuit uses its own PURIFI 1ET400A module. These high-performance Class D amplifier circuits each offer a very comfortable 200W at 8 Ohm while benefiting from the high efficiency of Class D amplifiers.
  • The 1ET400A modules embody a high gain loop greater than 75dB over the entire frequency band, providing high performance over the entire spectrum, surpassing any amplifier of any class.
  • Highly efficient in terms of Intermodulation Distortion Mode (IMD), these modules enable the LPA-S400ET to deliver a stereophonic image with high accuracy across the entire spectrum, providing even greater clarity during even the most complex musical works.
  • Harmonic distortion (THD) is kept extremely low at all power levels. This results in a lack of sound signature and the ability to reproduce all types of music without coloration.
  • The output noise is negligible, which allows deep silences and promotes the appearance of detail when listening at low volume levels.
  • The circuit benefits from a high rejection level (PSRR) that minimizes the impact of the power supply on audio performance.
  • The load-independent frequency response makes it possible to enjoy all the qualities of this amplification technology, even with the most difficult to drive speakers.
  • Low power consumption at rest and electromagnetic radiation (EMI). The high gain loop significantly relieves the workload of MOSFETs and allows them to operate under optimal operating conditions, reducing losses and EMI emissions.
  • The LPA-S400ET has its amplifier modules connected with a specially developed interface card for optimal integration.

Hypex Power Supply Module SMPS1200A400

The SMPS1200 switched-mode power supply is a very high efficiency model capable of developing a rated power of 1200 Watts in an extremely small footprint. It has been specifically designed and developed by Hypex to provide the 2x64V voltage required to operate the most demanding amplifier modules.

This low-noise quality power supply meets the power requirements of the amplifier modules in every respect. In addition, the amplifier modules themselves have an excellent ability to reject supply noise. This makes the LPA-S400ET extremely insensitive to mains imperfections and voltage/current fluctuations that can cause interference noise.

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

Audiophonics interface board

The 2 modules are driven in phase opposition, to cancel the "Power-Supply Pumping" effect. This allows a greater stability of the power supply, distributing alternately on each rail the calls of current and thus increasing its capacities.

We have opted for a 2-level voltage regulation, to optimise the power supply to the OPAs and the auxiliary voltage supplied to the modules.

One Texas Instrument LM4562 OPA per channel is used. These are very low distortion OPAs offering the highest transparency with a very low THD. They are mounted on a DIP8 socket, allowing their replacement if needed.

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

  • Gain of +7.2dB, i.e. a total of 20dB - Maximum power reached with a signal of -4.2V RMS.
  • Gain of +12.5dB, i.e. a total of 25.3dB (default) - Maximum power reached with a signal of -2.25V 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 strong preamplifier, capable of driving a 2 to 4K Ohm load and reaching a voltage of -10V RMS.

Connectivity

Designed for easy integration, the LPA-S400ET has a balanced (XLR) and unbalanced (RCA) stereo input. Bipolar switches allow easy switching between input sources and even allow independent channel control.

On the output side, BP-207 carbon / 24k Ø5.5mm gold / carbon insulated terminals provide an excellent connection to the loudspeakers.

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

THD+N

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

Frequency response

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

THD vs Freq

Audiophonics LPA-S400ET Amplificateur de puissance PURIFI 2x400W 4 Ohm

Technical characteristics

Specifications
Product typePower amplifier
Power227W @ 8Ω, 1%THD
425W @ 4Ω, 1%THD
450W @ 2Ω, 1%THD
THD+N0.0007% @ PO=1W, f=1kHz
0.00026% @ PO=10W, f=1kHz
0.00015% @ PO=100W, f=1kHz
0.0007% @ PO=1W, f=20Hz-20kHz
0.00029% @ PO=10W, f=20Hz-20kHz
0.00017% @ PO=100W, f=20Hz-20kHz
IMD (CCIF)0.00025% @ PO=1W, f=18kHz+19kHz
0.00022% @ PO=10W, f=18kHz+19kHz
0.00027% @ PO=100W, f=18kHz+19kHz
IMD (DIM)0.002% @ PO=1W, DIM30
0.002% @ PO=10W, DIM30
0.002% @ PO=100W, DIM30
Quiescent noise11.5µV (A-Weighted)
Dynamic range131dB @ 4Ω (A-Weighted)
SNR131dB @ 4Ω (A-Weighted)
Frequency response20Hz - 20kHz ±0.01dB @ RL=8Ω
20Hz - 20kHz ±0.01dB @ RL=4Ω
20Hz - 20kHz ±0.01dB @ RL=2Ω
Output impedanceIout = 1A @ 0.07mΩ, 1kHz
Iout = 1A @ < 0.65mΩ, 20Hz-20kHz
Input impedanceRCA : 47kΩ / XLR : 100kΩ
Bypass : 2.2kΩ / 4.4kΩ
General
Power supply230V (110V on demand)
Dimensions (without connectors)19 x 35.9 x 7.8cm
Weight3.17kg
Housing materialAluminium
ColorBlack
 
Data sheet
InputXLR
InputRCA
OutputSpeaker terminal
ColorBlack
ChannelDual Mono
Light symbolYes
ClassClass D / T
Fuse holderYes
Amplifier chipPurifi 1ET400A
Power (W)400.0
 
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Average votes
5.0 / 5
26 reviews
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Note :
 5/5
Date :
Clean power
I'm comparing this amp with two Schiit Aegir's used as mono blocks, fed by a Freya+.

Maybe my speakers need more than the Aegir's can provide (Tekton Electron SE & Tekton Mini-Lore Monitor), but there's just an ease and clarity in the Audiophonics amp that the Schiit doesn't really hit. At least at lower volumes. I'll have to do some more listening. Very very good quality and sound though. A+
 (1)
 (0)
This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
Note :
 5/5
Date :
LPA-S400ET class d Purifi2x400w After one year of use
Dear Friends,

After one year of use and system developments I thought it worth to write a second chapter to my original review:

So, I changed to Electocompaniet ECI-2 DAC, and Focal Kanta No2 Speakers. Obviously I had to recalibrate the whole cabling from power to speakers. Finally I have made some acoustic treatments in my Hi-Fi room too which is absolutely needed if you want to reach real bass and prefect focuses. The end result is simple fantastic! I know that the amplifier is still the cheapest element in my system, but friends it makes the job so-so well, that I am still amazed in every single day how fantastic is the music ( I use Tidal master) what I can hear. The amplifier has zero distortion with plenty of fine details, endless power, fantastic deep bass levels, and space creation for the instruments-singers, no heat issue at all and finally, excellent price /performance ratio.

I am a huge fan of cabling, so I recommend to have each Hi-Fi element separate and connect them with matching cables ( I mainly use own selected, paired and soldered together cables and of course solid dc converters to the small Hi-fi pc and to the X-SPDIF2 USB to RCA converter too.)

So if you need affordable amplifier with a capability to drive even much more expensive elements, do not hesitate, just go ahead!
 (1)
 (0)
This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
Note :
 5/5
Date :
A.Z.
Very good value. Very good sound.
Rapport qualité prix très bon, et le son aussi.
Very quick -service- très rapide.
Bravo.
 (1)
 (0)
This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
Note :
 5/5
Date :
Wonderful clarity, energy and musicicality
Formidable!
 (1)
 (0)
This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
Note :
 5/5
Date :
Excelent
VERY precise amplifier. Excelent. Noise is zero.

The blue leds (2) on the preamp board are so bright they make bars of blue on my ceiling thru the ventilation slits. Could do with a little less. I'll modify their resistors.
Trigger option on the outside would be nice.

Thanx for this fantastic amplifier !
 (1)
 (0)
This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
 
AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm
We are proud to offer you the Audiophonics LPA-S400ET, a Class D stereo power amplifier based on two Purifi 1ET400A modules. This ready-built and...

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