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This review has been posted for AUDIOPHONICS HPA-S500ET Power Amplifier Class D Stereo Purifi 1ET7040SA 2x500W 4 Ohm 
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AUDIOPHONICS HPA-S500ET Power Amplifier Purifi 1ET7040SA
The Audiophonics HPA-S500ET power amplifier unveils a Class D architecture based on a pair of Purifi 1ET7040SA modules and a custom-designed power supply to enable the amplifier to deliver its full potential. Like all Audiophonics Workshop products, the HPA-S500ET is meticulously designed and assembled by hand in our workshop in France.
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AUDIOPHONICS HPA-S500ET
Power Amplifier Class D Stereo Purifi 1ET7040SA 2x500W 4 Ohm
The Audiophonics HPA-S500ET power amplifier unveils a Class D architecture based on a pair of Purifi 1ET7040SA modules and a custom-designed power supply to enable the amplifier to deliver its full potential. Like all Audiophonics Workshop products, the HPA-S500ET is meticulously designed and assembled by hand in our workshop in France.
With this model, you get a powerful, high-performance amplification solution, capable of powering demanding audio systems while delivering incredibly fine, linear sound reproduction. There's no compromise between power and sonic precision. Purifi modules feature a particularly rigorous design for exceptional measured performance.
All components are housed in a sturdy, solid aluminum enclosure, with openings and heat sinks for efficient heat dissipation. Its design also limits the impact of interference on the signal.
Audiophonics HPA-S500ET: an amplifier to drive complex and difficult speakers
One of the special features of the HPA-S500ET amplifier is that it practically doubles its power under a 2-ohm load. In fact, it can develop up to 2x 950W of power at 2 ohms (1% THD). The PURIFI 1ET7040SA module is exploited to its full potential in the HPA-S500ET, thanks to its custom-designed 2000W power supply delivering 70V. This amplifier is therefore ideal for use with loudspeakers with multiple drivers and crossovers that are often difficult to control.
A pair of Purifi 1ET7040SA modules
Each channel of the amplifier circuit uses its own Purifi 1ET7040SA module. These incorporate a high-performance Class D architecture with an available power of 2x500W into 4Ω or 2x250W into 8Ω and a high efficiency of 94%. They also ensure incredibly low levels of THD, intermodulation distortion and noise, favoring rich, precise and perfectly transparent sound reproduction, respecting the original audio signal to reproduce your music with flawless, coloration-free fidelity. It also guarantees a wide, realistic sound image for perfect immersion.
The main feature of the ET7040SA compared to its little brother the ET400A is its current capacity, making it stable under 2ohm, and bringing its maximum power to 950W. What's more, the frequency response of these modules is totally independent of load, allowing you to take full advantage of the capabilities of this design, even with speakers that are difficult to drive. The circuit also benefits from a high level of rejection (PSRR), reducing the impact of the power supply on audio performance. The two Purifi 1ET7040SA amplifier modules are linked by a specially developed interface board for optimum integration.
A customized power module
The Audiophonics HPA-S500ET features a specially designed, high-efficiency PFC switching power supply. Delivering a power of 2000W and a voltage of 70V, it provides optimum, clean and stable power to the amplifier modules. The modules are thus able to deliver their full potential and develop their full power, without restriction.
This power supply also ensures very low noise levels, and incorporates two stages of EMI filtering. Output voltages are tightly regulated, and the PFC system offers effective power factor correction for a particularly clean signal. This PFC power supply can be operated flexibly from 100 to 240V AC, without switching.
Audiophonics interface card
The two modules are controlled in phase opposition, to cancel the "Power Supply Pumping" effect. This makes for greater power supply stability, distributing current draw alternately on each rail, thus increasing its capacity. We opted for two-level voltage regulation, to optimize the power supply to the AOPs and the auxiliary voltage supplied to the modules. One Audiophonics OPA1656 is used per channel. These are very low-distortion PDUs, offering maximum transparency with very low THD. They are mounted on a socket so they can be replaced if necessary. To suit all applications, we've opted for three gain settings, switchable via jumper on the underside of the unit.
Balanced & Single-ended connectors
Designed for easy integration, the HPA-S500ET features both balanced XLR and single-ended RCA stereo inputs. Bipolar selectors make it easy to change input sources, and even allow independent control of channels. On the output side, insulated Audiophonics terminal blocks (developed in partnership with AEC Connectors) with 24k gold-plated contacts ensure an excellent connection between amplifier and loudspeaker. A dual 5-12V trigger module lets you integrate the amplifier into an automatic on/off chain for your entire audio system.
This amplifier's trigger needs to be used with a mono trigger cable (sold separately).
| 1 | ON/OFF button |
| 2 | Power input |
| 3 | Trigger |
| 4 | Right channel speaker output |
| 5 | Left channel speaker output |
| 6 | Right channel XLR input |
| 7 | Right channel input selector |
| 8 | Right channel RCA input |
| 9 | Left channel XLR input |
| 10 | Left channel input selector |
| 11 | Left channel RCA input |
Technical characteristics
| Specifications | |
|---|---|
| Product type | Power amplifier |
| Output power (max) | 2x950W @ 2Ω, 1% THD 2x800W @ 2Ω, 0.1% THD 2x500W @ 4Ω, 1% THD 2x420W @ 4Ω, 0.1% THD 2x250W @ 8Ω, 1% THD 2x210W @ 8Ω, 0.1% THD |
| Efficiency | 94% @ 500W, 4Ω, 1kHz |
| Inputs | Balanced stereo XLR Single-ended stereo RCA |
| Outputs | Speaker terminals |
| Trigger | 2* Trigger 5-12V connectors on Jack 3.5mm |
| THD+N | 0.0004% @ 1W, 1kHz 0.00035% @ 10W, 1kHz 0.00035% @ 200W, 1kHz 0.0006% @ 1W, 20Hz-20kHz 0.0009% @ 10W, 20Hz-20kHz 0.0008% @ 200W, 20Hz-20kHz |
| IMD (CCIF) | 0.0002% @ 1W, 18kHz+19kHz 0.00015% @ 10W, 18kHz+19kHz 0.0002% @ 200W, 18kHz+19kHz |
| IMD (DIM) | 0.002% @ 1W, DIM30 0.0012% @ 10W, DIM30 0.0009% @ 200W, DIM30 |
| Idle noise | 14µV (A-wt) |
| Dynamic range | 129dB(A) |
| Output noise | ~14µV(A) |
| SNR | 129dB(A) |
| Frequency response | ±0.01dB @ 8Ω, 20Hz-20kHz ±0.01dB @ 4Ω, 20Hz-20kHz ±0.01dB @ 2Ω, 20Hz-20kHz |
| Input impedance | RCA : 47kΩ / XLR 100kΩ Bypass : 2.2kΩ / 4.4 kΩ |
| Output impedance | < 12µΩ @ 1kHz |
| Gain / Input sensitivity for max power at 0.1% THD | 20dB / 4.19Vrms 26dB / 2.07Vrms 32dB / 1.05Vrms 34dB / 0.83Vrms |
| General | |
|---|---|
| Supply voltage | 100-240V AC |
| Housing material | Aluminum |
| Total dimensions (WxDxH) | 435 x 355 x 73mm |
| Weight | 5.9kg |
| Color | Black |
| Package | 1* Audiophonics HPA-1Et7040SA 1* Power cable |
| Input | XLR |
| Input | RCA |
| Output | Speaker terminal |
| Color | Black |
| Channel | 2 (Stereo) |
| Class | Class D / T |
| Amplifier chip | Purifi 1ET400A |
| Power (W) | 400.0 |
| Remote Control | No |
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Average votes 5.0 / 5 13 reviews | Why write products reviews ? You can share your feelings about products and help other people by sharing your experience |
Note :
5/5
Date :
2025-07-13
Jean V.
Note :
5/5
Date :
2025-07-13
Jean V.
Utilisateur de 2 blocs mono Hypex Ncore 500, j’ai souhaité voir ce que pouvait apporter les modules Purifi, sans conviction débordante !
Eh bien, je m’étais lourdement trompé !!
Dès les 1ères notes, la différence est flagrante et saute aux oreilles !
Naturel, transparence, neutralité, définition, richesse d’informations, douceur du haut médium aigue, tout a franchi plusieurs crans. La définition spatiale, la précision, le naturel de la représentation de l’image reproduite, son architecture, sont vraiment devenue addictive !
Si le médium et l’aigu gagne une richesse de micros informations digne des meilleurs classe A, ce qui m’a étonné, c’est que l’on retrouve cette richesse, même dans le bas du spectre !
De plus, la dynamique est impressionnante, ce qui est, peut-être, lié à la l’alimentation sous 70V !
Superbe acquisition, qui me fait redécouvrir des enregistrements que je pensais, parfaitement, connaitre !
Contexte d’écoute : musique essentiellement classique, enceintes Revel Performa 228 Be dans une salle dédiée, indépendante, construite spécialement, traitée acoustiquement. Système piloté par DSP.
Merci à Bruno Putzeys pour la conception des modules et à Audiophonics pour la mise en œuvre.
This review has been posted for AUDIOPHONICS HPA-S500ET Power Amplifier Class D Stereo Purifi 1ET7040SA 2x500W 4 Ohm Eh bien, je m’étais lourdement trompé !!
Dès les 1ères notes, la différence est flagrante et saute aux oreilles !
Naturel, transparence, neutralité, définition, richesse d’informations, douceur du haut médium aigue, tout a franchi plusieurs crans. La définition spatiale, la précision, le naturel de la représentation de l’image reproduite, son architecture, sont vraiment devenue addictive !
Si le médium et l’aigu gagne une richesse de micros informations digne des meilleurs classe A, ce qui m’a étonné, c’est que l’on retrouve cette richesse, même dans le bas du spectre !
De plus, la dynamique est impressionnante, ce qui est, peut-être, lié à la l’alimentation sous 70V !
Superbe acquisition, qui me fait redécouvrir des enregistrements que je pensais, parfaitement, connaitre !
Contexte d’écoute : musique essentiellement classique, enceintes Revel Performa 228 Be dans une salle dédiée, indépendante, construite spécialement, traitée acoustiquement. Système piloté par DSP.
Merci à Bruno Putzeys pour la conception des modules et à Audiophonics pour la mise en œuvre.
Note :
5/5
Date :
2025-02-02
David T.
Note :
5/5
Date :
2024-12-20
Antonio D.
Excellent
Super amplificateur, très neutre, dynamique enorme, beaucoup de réalisme et transparence, sans jamais fatiguer a l´ écoute.
Je l´ utilise avec mon DMP A8 directement et j'en suis très satisfait.
J'avais dans ma liste des ampli coutant 2 ou 3 fois son prix, de marques très réputées et je le préfère a tous sans regarder au prix.
Je viens de lui changer les AOP audiophonic par des sparkos 3602, mais trop tot pour un avis, mais au premières écoutes il me parait que le son a les basses et dimensions différentes, pas nécessairement mieux, mais je n'ai que 3 heures d'écoute.
Mes audiovector QR7 sont maintenant bien alimenter et son devenus tous ce que je voulait, merci Audiophonic.
This review has been posted for AUDIOPHONICS HPA-S500ET Power Amplifier Class D Stereo Purifi 1ET7040SA 2x500W 4 Ohm Super amplificateur, très neutre, dynamique enorme, beaucoup de réalisme et transparence, sans jamais fatiguer a l´ écoute.
Je l´ utilise avec mon DMP A8 directement et j'en suis très satisfait.
J'avais dans ma liste des ampli coutant 2 ou 3 fois son prix, de marques très réputées et je le préfère a tous sans regarder au prix.
Je viens de lui changer les AOP audiophonic par des sparkos 3602, mais trop tot pour un avis, mais au premières écoutes il me parait que le son a les basses et dimensions différentes, pas nécessairement mieux, mais je n'ai que 3 heures d'écoute.
Mes audiovector QR7 sont maintenant bien alimenter et son devenus tous ce que je voulait, merci Audiophonic.
Note :
5/5
Date :
2024-12-19
Ron L.
Amazing !!
After reading reviews and hearing experiences from friends, I switched to this amplifier.
After connecting I was pleasantly surprised.Amazing!! Lots of power, dynamics and soundsstage. My Audiovector QR7 SE came to life. No more classe A or A/B for me!
This review has been posted for AUDIOPHONICS HPA-S500ET Power Amplifier Class D Stereo Purifi 1ET7040SA 2x500W 4 Ohm After reading reviews and hearing experiences from friends, I switched to this amplifier.
After connecting I was pleasantly surprised.Amazing!! Lots of power, dynamics and soundsstage. My Audiovector QR7 SE came to life. No more classe A or A/B for me!
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