AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier 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 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.

Gain of +7.2dB, i.e. a total of 20dB (default) - Maximum power reached with a signal of -4.2V RMS.

Gain of +12.5dB, i.e. a total of 25.3dB - 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.

Specifications
Product type	Power amplifier
Power	227W @ 8Ω, 1%THD 425W @ 4Ω, 1%THD 450W @ 2Ω, 1%THD
THD+N	0.0007% @ 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 noise	11.5µV (A-Weighted)
Dynamic range	131dB @ 4Ω (A-Weighted)
SNR	131dB @ 4Ω (A-Weighted)
Frequency response	20Hz - 20kHz ±0.01dB @ RL=8Ω 20Hz - 20kHz ±0.01dB @ RL=4Ω 20Hz - 20kHz ±0.01dB @ RL=2Ω
Output impedance	Iout = 1A @ 0.07mΩ, 1kHz Iout = 1A @ < 0.65mΩ, 20Hz-20kHz
Input impedance	RCA : 47kΩ / XLR : 100kΩ Bypass : 2.2kΩ / 4.4kΩ

Specifications

Product type

Power amplifier

Power

227W @ 8Ω, 1%THD
425W @ 4Ω, 1%THD
450W @ 2Ω, 1%THD

THD+N

0.0007% @ 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 noise

11.5µV (A-Weighted)

Dynamic range

131dB @ 4Ω (A-Weighted)

SNR

131dB @ 4Ω (A-Weighted)

Frequency response

20Hz - 20kHz ±0.01dB @ RL=8Ω
20Hz - 20kHz ±0.01dB @ RL=4Ω
20Hz - 20kHz ±0.01dB @ RL=2Ω

Output impedance

Iout = 1A @ 0.07mΩ, 1kHz
Iout = 1A @ < 0.65mΩ, 20Hz-20kHz

Input impedance

RCA : 47kΩ / XLR : 100kΩ
Bypass : 2.2kΩ / 4.4kΩ

General
Power supply	230V (110V on demand)
Dimensions (without connectors)	19 x 35.9 x 7.8cm
Weight	3.17kg
Housing material	Aluminium
Color	Black

General

Power supply

230V (110V on demand)

Dimensions (without connectors)

19 x 35.9 x 7.8cm

Weight

3.17kg

Housing material

Aluminium

Color

Black

Input	XLR
Input	RCA
Output	Speaker terminal
Color	Black
Material	Aluminium
Channel	Dual Mono
Accepts Banana Plugs	Yes
Light symbol	Yes
Class	Class D / T
Fuse holder	Yes
amplifier chip	Purifi 1ET400A
Power (W)	400.0

a Game changer
I've been a fan of Bruno Putyz and his designs for many years and consider him a pioneer of Class D. Hypex, N-core have been adopted by so many high end manufacturers NAD, Bel Canto etc etc. I was very excited when Purifi announced eigentakt. Even more so when audiophonics packaged it so attractively and affordably for the enthusiast with the well proven Hypex SMPS power supply. An immediate buy. I love building but dont have the machinery or time for nice casework.
Comments. Excellent build quality in and out. If you want pretty spend another 5k.
initially disappointed with sound compared to Nord n core monblocks with hardy discrete amps.
Immediately looked at lm4652 (see other reviews) and replaced with sparkos discrete dual opamps. A revelation. up there with the very best. This is super audiophile at bargain basement prices.
Tres bien. Merci beaucoup.
NM

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This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm

AUDIOPHONICS LPA-S400ET
I split my review into three chapter, 1, product and service, 2, sound quality, 3 power rating
1, I have ordered the amp. on a weekend, received the following Friday. At other sources you should calculate minimum 2-4 weeks lead times! So, the speed of delivery was absolute fantastic! Well done! Thank you! Everybody mentioning of the packaging, because there is no special hard paper box, but we get double box with filling material, which is safe enough. The product itself is very solid, nicely built and looks even better in reality than on pictures. Well done! Thanks a lot!
2, I had to wait with this review a week, because I had to find the right cabling. I made the change for this amp from an Emotiva XPA Gen2. When I simple changed them and used the same cables I have got quite week sound. So I started the big changing /fine tuning/ process. Making the long story short, I have changed each cable, selected them out from many alternatives, creating a formerly not used combo from the power cord trough out the USB cable, the RCA digital signal cable, the XLR analog cable and finally the speaker cable. By this process I finally arrived to a very capable, decent, detailed, extreme clean sound which I did not hear from my system so far. Thanks a lot for this!
3, Regarding the power level. The Emotiva papered 500 wpc at 4 ohms. The Purifi rated 425 wpc at 4 ohms. In real life that should not be felt so differently. But if I want to reach the same feeling of sound pressure with the Purifi like with the Emotiva, I need to turn up the DAC/Preamp volume controller from 50% to 75% and at the same time the Windows volume controller from 40% to 50%. ( the Tidal volume controller than can stand on the same place) . So according to my subjective feeling the wpc different is rather around 150 watt instead of 75 watt, which can mean that either the Emotiva delivers more or the Purifi less. ( or both at the same time )
Anyhow, this amplifier absolutely worth the money! Well done, thanks again!

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Listening Musica Nuda

Before posting this review I used the amplifier for a week, listening every day.
Indeed, the musica nuda of the two from Musica Nuda, the voice of Petra Magoni and the double bass of Ferruccio Spinetti in Live a Fio. I continued with Laura Fygi, The Latin Touch, finished with Chantal Chamberland, Soiree.
The amplifier is a "purist", it does not add colors or shades to the sound, it plays exactly what the source senis feeds in .
It is a quality product, its industrial look may or may not please you ... it depends on everyone. It's certainly not to showoff to your audiophile friends with branded gear, but if you do then you really don't have to feel inferior to them, the end of the day, the sound matters and in this case yes, it matters.
A Big Bravo to Audiophonics for this product and for the sales & logistics services!
By the way Audiophonics, I love the Gran Torino, the French version by Chantal Chamberland, sounds .... terribly good on this amplifier.
Keep your good work and thanks,
Corneliu

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最初の喜び、開封時の落胆、そして2度めの喜び
・最初の喜び
納期は2ヶ月、と覚悟していたけど、10日後には日本の郵便局が届けてくれたよ。迅速に送ってくれてありがとう。
途中でくれたeメールの情報に安心できたよ。信頼できるチームだ。
・開封時の落胆
日本の関税が高すぎる。ポストマンに9000円くらい払った。次から日本向け納品書には500ドルって記載して発送してくれませんか？
開封したら、3mmサイズの白い発泡スチロールが1万個。誰が掃除する?それは私。
これは日本の"o-mo-te-na-shi文化"では起きない事案。改善してください。
・そして2度めの喜び
気を取り直して開封の続き。電源は100v-120v。これは嬉しい。
オリジナルは110v-230vのはず。100vの日本を気遣って変更してくれたんだね。日本の一般家庭では変圧しないと使えないからね。こういうサプライズは嬉しい。ありがとう、"omotenashi"
・音
昇圧して115vで聴いています。
押しのある音。音の粒にエネルギーを感じる。分離もいい。実にいい。強弱の自然さ。ちょっとスゴイぞ。
デジタルアンプの進化に感動しています。音楽がスローに聞こえる。これを何度も体験できる幸せ。
実は今回DACも変えたんだけどねー
anyway、この価格でこの音。優秀なアンプ。最高に満足しています。
良かったよ、ありがとう

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première écoutes
beaucoup de finesse dans le message ,mais je pense que dans quelque semaines il y aura plus de maturité après un rodage méticuleux,car pour l,instant c'est un peu brouillons, merci à la rapidité d' audiophonics par contre zero pour la poste a qui on paye pour une livraison au domicile et pas de chance il faut encore perdre du temps pour aller chercher son colis au bureau de poste et perdre 2h de boulot car eux ferme a 17h00.

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This review has been posted for AUDIOPHONICS LPA-S400ET Class D Stereo Amplifier Purifi 2x400W 4 Ohm