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3e audio A7/A7 Mono Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 3 1.7%
  • 2. Not terrible (postman panther)

    Votes: 9 5.1%
  • 3. Fine (happy panther)

    Votes: 49 28.0%
  • 4. Great (golfing panther)

    Votes: 114 65.1%

  • Total voters
    175
Notice anything? Imagine you are driving your speakers full power and the impedance drops. Some bass kick or whatever. I wouldn't bet on the speakers.

Of course, we can trust 8 ohm speakers to never go below 4 ohm. In which case you are right, A7 is pointless.

V
If a speaker gets overdriven (with clean power) by playing music, there is something wrong with the speaker, the gain structure, the user... but not usually the amp.
 
100 euro extra. Anyway, do you evaluate amplifiers on how they drive (and protect) your speakers or on how much can you brag about standard ratings?

This is a Tpa3255 PFFB stereo BTL. Aiyima A70.

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And this is the 3e A7

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Notice anything? Imagine you are driving your speakers full power and the impedance drops. Some bass kick or whatever. I wouldn't bet on the speakers.

Of course, we can trust 8 ohm speakers to never go below 4 ohm. In which case you are right, A7 is pointless.

V
That's what was said above) that being said the A7SE was not measured. You are extrapolating by analogy.
 
This is a review and detailed measurements of the A7 / "A7 Mono" stereo power amplifier with balanced inputs. It was sent to me by the company. I have no idea what it costs in US. Audiophonics lists it for 379,00 €tax incl.
View attachment 444144
While the A7 may look like its competitors, it has a heft to it that I don't recall others not having. It really feels like it is filled with lead or something! A nice volume control in the middle adjusts the gain but it can also be bypassed using a switch in the back. Pushing the volume control quickly switches between XLR balanced and RCA. Two thoughtful clipping indicators are provided, making me wish it would be a standard feature on any amplifier. A minor nit: LED colors indicating which input is active is red and clipping in green. I think based on convention, the latter should be red.

Back panel shows nice set of features:
View attachment 444145
Trigger input is provided as is the aforementioned combo TRS/XLR balanced inputs. Low and high gain switch is provided but I focused on low gain as that is fully compatible with current audio products outputting 2/4 volts. Yes, there is that monster GaN power supply! It can of course be purchased with other options. The input connector says max is 48 volt but per designer, the mono configuration, which is just using the left channel, can go up to 52 volts. He said I could test in stereo just the same and that is what I did. I found no issues.

FYI, I was impressed with the secure way the power supply input accepts the plug. There is a lot of current and power involved here so good to see a tight fit.

One nice feature, beside trigger, is auto-shut off in case of no input signal. I left it on by accident and was pleasantly surprised when I came back and it had gone to sleep.

3e audio A7 Amplifier Measurements
Let's start with low gain, volume control set to (volume bypass didn't make a difference), and XLR as inputs:

View attachment 444146
Very nice. Well above average in performance with distortion below threshold of hearing:
View attachment 444147
View attachment 444148

RCA input as usual loses a bit, but not much, scoring 100 dB with again, inaudible distortion:
View attachment 444149

SNR is the limit here, which is quite good actually:
View attachment 444150
At full power, it provides transparency for practically all music produced!

The A7 uses post filter feedback (PFFB) so it is essentially load (speaker) independent:
View attachment 444151

Crosstalk while much better than average, is a bit worse than 3e audio A5:
View attachment 444152

As is typical here, above 1 kHz, distortion does climb:
View attachment 444153
View attachment 444154

This is one powerful little amplifier, easily besting its nicely mentioned specs:
View attachment 444155
View attachment 444156

View attachment 444157

Edit: forgot to include the power vs frequency sweep:

View attachment 444184
Power is more or less sustained across the full audible band:
View attachment 444158
View attachment 444159

Its distortion goes from 0.05% to huge amount as it clips so I could not test it at 1% THD at higher frequency. So I searched for power point at just 0.05% which disadvantages this amp a bit.

My reactive loadbox still doesn't like these bridged amplifiers so I could only test the left channel (although per above, stereo and mono performance were the same):
View attachment 444160

View attachment 444161

You have to keep reminding yourself that this much power is coming out of this little box, no bigger than the old CD cases!

Finally, the amplifier is rock solid on power up:
View attachment 444162

Oh, too much on my mind so I forgot to run the power up/down glitch test.

Conclusions
If my memory serves me right, 3e audio was the first company to bring us high performance TI TPA3255 class D amplifiers with PFFB. While they have more competition now, it is clear they intend to stay on top of this game, squeezing every bit of performance out of this architecture, while providing nice feature set. We are talking high performance, high power amplifiers that are tiny yet deliver what people need in most cases.

I am happy to recommend 3e audio A7 / A7 Mono stereo audio amplifiers.

------------
As always, questions, comments, recommendations, etc. are welcome.

Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
52v 9a power supply is nowhere to be found. They're shop in Ali doesn't offer it. Strange.
 
52v 9a power supply is nowhere to be found. They're shop in Ali doesn't offer it. Strange.
My sample has been here for quite a while. So the accessory situation may have changed.
 
52v 9a power supply is nowhere to be found. They're shop in Ali doesn't offer it. Strange.
"52V is a customize voltage and supplier do need a certain quantity for MOQ,we didn't have confidence how the marketing will be at begining so we decide to combine 48V/5A and 48V/10A(seperated) same as A7.
in the next integrated(SMPS) amp will re-use this 52V one with PCB redesign and other optimized"

 
I agree with Sokel's statement.

Any serious DIY enthusiast, or even a manufacturer, knows very well that ELNA has long since stopped producing SILMIC II.

There were stocks, for example at 'HIFI COLLECTIVE,' but there's barely enough left to equip a single device... :(

Lester of SYLPH AUDIO, for his part, had informed his customers that his PCBs would be equipped with SILMIC II as long as they were available and that they would subsequently be replaced with NICHICON UFG (fine gold series): this is called 'transparency' (as far as customers are concerned).

Amirm: I suggest you contact either ELNA, MOUSER, DIGIKEY, FARNELL, TOPPING, or SMSL (your choice) to ask them this question ;)

You will see that I can therefore affirm that any device or single component resold under the ELNA SILMIC II name is not authentic.

This is therefore a 'commercial claim' intended to benefit from the reputation for the quality of its components in an unjustified and abusive manner.

In France, we call this counterfeiting and/or false advertising, and with the consequences that this entails :rolleyes:

Some distributors will try to justify themselves by sending you a photo of a box with the original delivery slip from ELNA, but if you do a search with GOOGLE images you will quickly realize that it comes from the 'meanders of the internet'.

Once again, I remind you that neither TOPPING or SMSL uses this reference in these devices and that this is not by chance...
 
I agree with Sokel's statement.

Any serious DIY enthusiast, or even a manufacturer, knows very well that ELNA has long since stopped producing SILMIC II.

There were stocks, for example at 'HIFI COLLECTIVE,' but there's barely enough left to equip a single device... :(

Lester of SYLPH AUDIO, for his part, had informed his customers that his PCBs would be equipped with SILMIC II as long as they were available and that they would subsequently be replaced with NICHICON UFG (fine gold series): this is called 'transparency' (as far as customers are concerned).

Amirm: I suggest you contact either ELNA, MOUSER, DIGIKEY, FARNELL, TOPPING, or SMSL (your choice) to ask them this question ;)

You will see that I can therefore affirm that any device or single component resold under the ELNA SILMIC II name is not authentic.

This is therefore a 'commercial claim' intended to benefit from the reputation for the quality of its components in an unjustified and abusive manner.

In France, we call this counterfeiting and/or false advertising, and with the consequences that this entails :rolleyes:

Some distributors will try to justify themselves by sending you a photo of a box with the original delivery slip from ELNA, but if you do a search with GOOGLE images you will quickly realize that it comes from the 'meanders of the internet'.

Once again, I remind you that neither TOPPING or SMSL uses this reference in these devices and that this is not by chance...

I agree with you about 3E Audio's marketing approach. If the ELNA SILMIC II are no longer produced, we can only say that this is false advertising. However, the performance is not affected, so even if I condemn this kind of practice, the product remains good.

@3eaudio take care please :
As a reminder, in France: Deceptive commercial practices are a criminal offense. They are punishable by two years' imprisonment and a fine of €300,000 (Article L132-2 of the French Consumer Code).
 
Last edited:
I completely agree with everything you said, Danyboun.

Just a side note: AUDIOPHONICS is located in France, what could their 'position' be on this matter ?
 
I completely agree with everything you said, Danyboun.

Just a side note: AUDIOPHONICS is located in France, what could their "position" be on this matter ?

In the interest of fairness, I contacted them about this. I would like to clarify this point.

No offense, but don't underline words or put them in bold either or other... Americans aren't fond of this practice in communication.
 
This is a review and detailed measurements of the A7 / "A7 Mono" stereo power amplifier with balanced inputs. It was sent to me by the company. I have no idea what it costs in US. Audiophonics lists it for 379,00 €tax incl.
View attachment 444144
While the A7 may look like its competitors, it has a heft to it that I don't recall others not having. It really feels like it is filled with lead or something! A nice volume control in the middle adjusts the gain but it can also be bypassed using a switch in the back. Pushing the volume control quickly switches between XLR balanced and RCA. Two thoughtful clipping indicators are provided, making me wish it would be a standard feature on any amplifier. A minor nit: LED colors indicating which input is active is red and clipping in green. I think based on convention, the latter should be red.

Back panel shows nice set of features:
View attachment 444145
Trigger input is provided as is the aforementioned combo TRS/XLR balanced inputs. Low and high gain switch is provided but I focused on low gain as that is fully compatible with current audio products outputting 2/4 volts. Yes, there is that monster GaN power supply! It can of course be purchased with other options. The input connector says max is 48 volt but per designer, the mono configuration, which is just using the left channel, can go up to 52 volts. He said I could test in stereo just the same and that is what I did. I found no issues.

FYI, I was impressed with the secure way the power supply input accepts the plug. There is a lot of current and power involved here so good to see a tight fit.

One nice feature, beside trigger, is auto-shut off in case of no input signal. I left it on by accident and was pleasantly surprised when I came back and it had gone to sleep.

3e audio A7 Amplifier Measurements
Let's start with low gain, volume control set to (volume bypass didn't make a difference), and XLR as inputs:

View attachment 444146
Very nice. Well above average in performance with distortion below threshold of hearing:
View attachment 444147
View attachment 444148

RCA input as usual loses a bit, but not much, scoring 100 dB with again, inaudible distortion:
View attachment 444149

SNR is the limit here, which is quite good actually:
View attachment 444150
At full power, it provides transparency for practically all music produced!

The A7 uses post filter feedback (PFFB) so it is essentially load (speaker) independent:
View attachment 444151

Crosstalk while much better than average, is a bit worse than 3e audio A5:
View attachment 444152

As is typical here, above 1 kHz, distortion does climb:
View attachment 444153
View attachment 444154

This is one powerful little amplifier, easily besting its nicely mentioned specs:
View attachment 444155
View attachment 444156

View attachment 444157

Edit: forgot to include the power vs frequency sweep:

View attachment 444184
Power is more or less sustained across the full audible band:
View attachment 444158
View attachment 444159

Its distortion goes from 0.05% to huge amount as it clips so I could not test it at 1% THD at higher frequency. So I searched for power point at just 0.05% which disadvantages this amp a bit.

My reactive loadbox still doesn't like these bridged amplifiers so I could only test the left channel (although per above, stereo and mono performance were the same):
View attachment 444160

View attachment 444161

You have to keep reminding yourself that this much power is coming out of this little box, no bigger than the old CD cases!

Finally, the amplifier is rock solid on power up:
View attachment 444162

Oh, too much on my mind so I forgot to run the power up/down glitch test.

Conclusions
If my memory serves me right, 3e audio was the first company to bring us high performance TI TPA3255 class D amplifiers with PFFB. While they have more competition now, it is clear they intend to stay on top of this game, squeezing every bit of performance out of this architecture, while providing nice feature set. We are talking high performance, high power amplifiers that are tiny yet deliver what people need in most cases.

I am happy to recommend 3e audio A7 / A7 Mono stereo audio amplifiers.

------------
As always, questions, comments, recommendations, etc. are welcome.

Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Hi Amir,
Thanks as usual for the review.
Is there any way to add to your tests for the, admittedly somewhat corner case, use with electrostatics, presenting, as they do, a capacitive load as opposed to resistive. Experience seems to point towards good high current delivery as a requirement. Currently using a pair of Quad 606 MK1 current dumpers to drive my Martin Logan's.
 
In the interest of fairness, I contacted them about this. I would like to clarify this point.

No offense, but don't underline words or put them in bold either or other... Americans aren't fond of this practice in communication.
USAicans must get really pissed at bibliographies!
 
It's not just Americans... it's general online etiquette. All capital letters means raising voice or yelling, bolded capital letters means shouting angrily or with extra emphasis.


JSmith

Sure, wish @ICIETDIYEUR could read you )
 
I'm not saying it is the case here - I have no idea.

But it is possible for a manufacturer to make a device obsolete in one (or more) geographic region, when they are still made and available elsewhere. It can be dependant upon global manufacturing/marketing strategy.
 
we talked about 'ELNA SILMIC II' (RFS series) capacitors which are CLEARLY indicated in the advertisement
In which advertisment? Do you have a Link?

PS
I have just checked it myself.
On the 3e audio website you can find the advertisement or reference to ELNA Silmic II

Not on the audiophonics website
 
Last edited:
@ICIETDIYEUR

From Audiophonic :

"Hi,
The Elna Silmic IIs are indeed no longer produced, but this doesn't mean that those used by 3E Audio are fake.
We believe these are NOS (New Old Stock), but we will still verify this with the manufacturer.
I will get back to you as soon as we receive a response from the manufacturer.
Pending a response, we will remove this clarification from the product sheets.

We remain at your disposal for any further questions and wish you a good day,

Sébastien FOURMOND
Sales Administration Manager - Customer Service"
 
Don't play on words or the appearance of Audionaut, because it's the same product, right ?

I just want to ask what a buyer would think if they were offered a piece of jewelry, for example, that was very pretty and well-made, but that it was labeled gold when it was actually just gold-plated metal ?

JSmith: You'll notice that I use boldface out of respect for the names and brands mentioned.
If this is misinterpreted by some, as it seems to be your case, then I apologize; it wasn't my intention, and I won't use this "typography" again.

Regarding AUDIOPHONICS, they are serious enough and know the legal provisions very well to act accordingly as Danyboun just pointed out in his post.
 
In which advertisment? Do you have a Link?

PS
I have just checked it myself.
On the 3e audio website you can find the advertisement or reference to ELNA Silmic II

Not on the audiophonics website
Audiophonics has just removed the information relating to Elna Silmic II caps for all 3E Audio products in their site following our discussions
 
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