AUDIOPHONICS LPA-S450ET Power Amplifier Stereo Purifi 1ET6525SA

We're proud to present the Audiophonics LPA-S450ET, a Class D stereo power amplifier based on two Purifi 1ET6525SA modules. Electronically similar to the HPA-S450ET, this version is housed in a more compact case, making it easier to use in environments where space is at a premium, and its architecture also limits the length of internal connections.

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Reference : 20206
New product

1 290,00 €tax incl.

1 075,00 € tax excl.
Including 0,05 € for green tax

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Shipping date: 09-07-2025.

Orders placed before 12h (GMT+1) will generally be shipped the same day (working day).

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Facturation France
SAV France

2 Years warranty

Accessories for this product

Find here a selection of useful and/or essential accessories for this product. These are specially selected by the Audiophonics team according to the characteristics of the product.

 
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This unit is supplied with a 230V AC power supply as standard. If you require a 110V input voltage, please select this using the switch on the underside of the unit before connecting it to the mains.


Audiophonics LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm

Audiophonics LPA-S450ET: 3/4 view

We're proud to present the Audiophonics LPA-S450ET, a Class D stereo power amplifier based on two Purifi 1ET6525SA modules. Electronically similar to the HPA-S450ET, this version is housed in a more compact case, making it easier to use in environments where space is at a premium, and its architecture also limits the length of internal connections.

This ready-to-install, ready-to-use model is aimed at audiophiles looking for a foolproof amplification solution, with considerable power reserves and impeccable definition. PURIFI modules are among the most rigorous Class D amplification solutions on the market, with measured performance that is simply outstanding.

The result is a high level of sound reproduction, suitable for use with demanding speakers, large listening rooms or studio applications requiring considerable headroom without compromising on the precision and richness of the audio message.

All components are housed in a sober, robust and compact aluminum case. It features openings to facilitate heat dissipation. Its design also limits the impact of interference on the signal.

Audiophonics LPA-S450ET : PURIFI 1ET6525SA module

Audiophonics LPA-S450ET: Two PURIFI 1ET6525SA modules

  • Each channel of the amplifier circuit uses its own PURIFI 1ET6525SA module. These high-performance Class D amplifier circuits each deliver a very comfortable output power of 450W at 4Ω or 230W at 8 Ohm, while benefiting from the high efficiency of Class D amplifiers.
  • The 1ET6525SA modules feature a high-gain loop in excess of 85dB over the entire frequency band, providing high performance across the entire spectrum, surpassing any amplifier of any class.
  • Highly effective in terms of intermodulation distortion (IMD), these modules enable the LPA-S450ET to deliver a stereophonic image of formidable precision across the entire spectrum, for redoubled clarity, even during the most complex musical works.
  • Harmonic distortion (THD) is kept extremely low at all power levels. This translates into an absence of sound signature and the ability to reproduce all types of music without coloration.
  • Output noise is negligible, allowing deep silences and favoring the appearance of detail when listening at low volume.
  • The circuit benefits from a high level of rejection (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 quiescent power consumption and electromagnetic radiation (EMI). The high-gain loop considerably relieves the workload on the MOSFETs, enabling them to operate under optimum conditions, reducing losses and EMI emissions.
  • The LPA-S450ET's amplifier modules are linked by a specially developed interface board for optimum integration.

Audiophonics LPA-S450ET: Hypex SMPS1200A400 power supply module

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

This high-quality, low-noise power supply meets the power requirements of the amplifier modules in every respect. What's more, the modules themselves have an excellent ability to reject power supply noise. As a result, the LPA-S450ET is extremely insensitive to mains imperfections and voltage/current variations that can cause parasitic noise.

Audiophonics LPA-S450ET : Hypex SMPS1200A400 power supply module

Audiophonics LPA-S450ET: Audiophonics interface board

The 2 modules are controlled in phase opposition, to cancel the “Power-Supply Pumping” effect. This makes for greater power supply stability, alternately distributing current calls on each rail, thus increasing its capacity.

A voltage regulation stage is used to optimize the power supply to the OPAs and the auxiliary voltage supplied to the modules.

One Audiophonics OPA1656 OPA is used per channel. These are very low-distortion OPAs offering the highest transparency with very low THD. They are mounted on a DIP8 socket, allowing them to be replaced if necessary.

To suit all uses, we have opted for 4 gain settings, selectable via jumper on the underside of the unit: 12.5dB, 20dB (default), 25dB and 29dB.

Audiophonics LPA-S450ET: Connectors

Designed for easy integration, the LPA-S450ET features both single-ended (RCA) and balanced (XLR) stereo inputs. Bipolar selectors make it easy to change input sources, and even allow independent control of channels.

At the output, BP-207 carbon / 24k gold insulated terminal blocks Ø5.5mm ensure an excellent connection with the speakers.

Audiophonics LPA-S450ET : Rear view

Audiophonics LPA-S450ET : THD vs Freq

Audiophonics LPA-S450ET : THD vs Freq

Audiophonics LPA-S450ET : THD+N

Audiophonics LPA-S450ET : THD+N

Audiophonics LPA-S450ET : Frequency response

Audiophonics LPA-S450ET : Frequency response

Test du AUDIOPHONICS LPA-S450ET par QOBUZ

If we had to keep just one power amplifier, it might just be this Audiophonics LPA-S450ET. It isn’t an entry-level product. But it’s equally far from the high end, and yet, it offers impeccable sound reproduction capabilities, both on paper and in practice. The power is there, but it takes a backseat to the music, which is reproduced with all its finesse, complexity, and presence. The LPA-S450ET will be a solid foundation to any high-quality Hi-Fi system.
 Logo Quobuz

Technical characteristics

Specifications
Product typePower amplifier
Inputs1x Balanced stereo XLR
1x Single-ended stereo RCA
Outputs2x Speaker terminals
Power2x230W @ 8Ω, 1%THD
2x450W @ 4Ω, 1%THD
2x510W @ 2Ω, 1%THD
Total harmonique distorsion (THD+N)0.00035% @ PO=1W, f=1kHz
0.0001% @ PO=10W, f=1kHz
0.00005% @ PO=100W, f=1kHz
0.00035% @ PO=1W, f=20Hz-20kHz
0.00029% @ PO=10W, f=20Hz-20kHz
0.0001% @ PO=100W, f=20Hz-20kHz
IMD (CCIF)0.0000003% @ PO=1W, f=18.5kHz+19.5kHz
0.0000006% @ PO=10W, f=18.5kHz+19.5kHz
0.0000005 % @ PO=100W, f=18.5kHz+19.5kHz
IMD (DIM)0.002% @ PO=1W, DIM30
0.002% @ PO=10W, DIM30
0.009% @ PO=100W, DIM30
Idle Noise6.6µV (A-Weighted)
Dynamic range137dB @ 4Ω (A-Weighted)
SNR137dB @ 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 @ 0.03mΩ, 1kHz
Iout = 1A @ < 0.35mΩ, 20Hz-20kHz
Input impedanceRCA : 10kΩ
XLR : 20kΩ
XLR Input gain / sensitivity for max power at 1% THD12.5dB / 10.06Vrms
20dB / 4.24Vrms
25dB / 2.39Vrms
29dB / 1.51Vrms
RCA Input gain / sensitivity for max power at 1% THD12.5dB / 5.03Vrms
20dB / 2.12Vrms
25dB / 1.24Vrms
29dB / 0.75Vrms
General
Power supply110-230V AC (230V par défaut)
Total dimensions (WxDxH)191 x 386 x 82mm
Weight3.17kg
Housing materialAluminum
ColorBlack
Package1x Audiophonics LPA-S450ET
1x Power cord
 
Data sheet
InputRCA
InputXLR
OutputSpeaker terminal
ColorBlack
Channel2 (Stereo)
ClassClass D / T
Amplifier chip1ET6525SA
Power (W)450.0
Remote ControlNo
 
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Average votes
4.8 / 5
13 reviews
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Note :
 5/5
Date :
Vraiment bien
Merci David, pour votre patience , et , disponibilité, je craignais que ce petit ampli ne fasse pas le poids, en kilo c est certain, face à mon Classé Audio, et bien, il est costaud le petit, le son est vraiment très bon, le conseil était fort avisé.
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This review has been posted for AUDIOPHONICS LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm
Note :
 5/5
Date :
Superbe choix
Le challenge n'était pas gagné d'avance : Alimenter mes Martin Logan Sequel II.
Après de nombreuses recherches sur les amplis adaptés, l'intelligence artificielle a attiré mon attention sur les amplis de classe D et notamment sur Hypex et Purifi.
Audiophonics m'a été d'excellent conseil dans le choix de celui-ci.
Je l'ai associé au préamplificateur MUSES72320 pour gérer facilement mes sources.
En plus, la livraison a été rapide et efficace.
Le résultat est exceptionnel quel que soit le volume d'écoute.
Merci à vous
 (0)
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This review has been posted for AUDIOPHONICS LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm
Note :
 5/5
Date :
Superbe Amplificateur
C'est mon 4ème ampli en Class D .. Je ne reviendrai plus vers les tubes , la class A ou même AB.
Absolu transparence , maintien du grave et dynamique, ce sont les qualités déjà connues et au top avec la dernière version de PURIFI.
Je l'ai utilisé avec différentes enceintes a rendement différents. avec le réglage de gain de la carte Audiophonics il est toujours possible d'avoir une bonne progression du réglage de volume.
Actuellement je l'utilise avec le Dac Preamp JADE de Metrum Acoustic. La qualité de fabrication est excellente ainsi que la possibilité de changer l'AOP si besoin .. !
Si vous optez pour des montages séparés avec ampli de puissance. C'est le meilleur choix à ce prix et peut être dans l'absolu. Il faudra penser à lui associer un bon câble secteur il y en a de bons ici dans la gamme ELECAUDIO, c'est ce que j'utilise aussi.
avec liaison MOGAMI XLR
Enfin je ne partage pas l'avis précédent qui parle d'un haut médium en avant .. , en fait ces amplis sont tellement transparents qu'ils mettent en évidence les qualités et les défauts des équipements associés.
Notamment les colorations caractéristiques de certaines marques !

 (1)
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This review has been posted for AUDIOPHONICS LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm
Note :
 3/5
Date :
Bien mais pas avec toutes les enceintes...
J'ai acheté cet ampli dans l'espoir de mieux alimenter mes enceintes Magnepan MG1.6 QR actuellement sur un Denon PMA 2000.
Si vous avez la même idée, oubliez! Le grave est étriqué, il est dépourvu du beau "moelleux" procuré avec le Denon. Le haut médium est outrageusement mis en avant au point de rendre l'écoute très fatigante sur certains titres. Les timbres sont dénaturés dans cette gamme de fréquence. D'une manière générale, la musique est désincarnée. Après deux mois d'essais, il m'apparait que cet appareil se marie très mal avec les Magnepan.
J'ai donc décidé de le tester sur mes vielles enceintes Rogers LS7T qui fonctionnent très bien avec mon ampli Onkio A 8500 (2 X 100 watts), et là, ça a été la très bonne surprise! Je l'ai associé à un DAC pré-ampli Silkline Zuki I acquis récemment. Eh bien, mes Rogers n'ont jamais aussi bien sonné! Le grave est charpenté, moelleux et soyeux à souhaits. Les timbres sont justes et équilibrés, l'aigu à sa place sans excès. L'écoute, légèrement flatteuse est vivante et extrêmement agréable.
En conclusion, selon mon expérience, cet ampli est capable du meilleur comme du pire en fonction des enceintes qui lui sont raccordées... Le mariage avec des Magnepan est désastreux mais, au contraire, il fait merveille avec des Rogers...
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This review has been posted for AUDIOPHONICS LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm
Note :
 5/5
Date :
Couldn't be more satisfied
A flawless power amplifier. The extension of the sound and the precision of left-right imaging are excellent—especially in solo piano performances, where you can see the sound hanging in space, fading away without any blur.
The treble is never harsh, and the overall sound is truly flat and stress-free. Despite this, even the lowest frequencies are clearly separated and dynamic without being overbearing. For acoustic music, this is exactly the sound I was looking for.

However, one point requires attention.
This amplifier also supports RCA input via a switch. But since the Purifi module is designed for a fully balanced configuration, using RCA results in a severe degradation in sound quality. Specifically, issues such as smearing, distortion, and poor imaging become noticeable—to the point where (to exaggerate slightly) it starts to resemble a sub-€100 Chinese digital amp.

Therefore, if your upstream equipment only has unbalanced RCA output, or a pseudo-XLR connection that only uses pin 2, simply using an adapter plug for conversion is not sufficient. The unbalanced-to-balanced conversion must be performed via active circuitry within the preamplifier!
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This review has been posted for AUDIOPHONICS LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm
 
AUDIOPHONICS LPA-S450ET Class D Stereo Amplifier PURIFI 1ET6525SA 2x450W 4 Ohm
We're proud to present the Audiophonics LPA-S450ET, a Class D stereo power amplifier based on two Purifi 1ET6525SA modules. Electronically...

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