3e audio A7/A7 Mono Amplifier Review

[Mort]

Because I immediately understood, accepted, and set aside this line of probability, with its perceptual bias, because if there's no evidence to support what I've heard, there's nothing to clarify or discuss.

You realize this is exactly bias? You rejected a high probability explanation because you 'understood and rejected' it?

 

[peng]

Not yet. Now that you mentioned it, I looked through your previous posts and found the link. Thank you. I'll need some time to figure it out. Unfortunately, I'm busy right now.

Good to know you are open to investigate further instead of just believing... For those who just believe/trust the ear, there is nothing anyone can do to change their mind, because no one knows what difference they actually heard, or thought they heard, all they can say is something like quoting experts in this field, like Dr. Olive, Dr. Toole and others who typically wouldn't care what people said they heard if they knew which devices were playing, i.e., comparison listening tests must be done blind. Those graphs show that particular Yamaha amp may have lower distortions in the high frequencies, the mentioned Klippel tests, and/or even just hearing tests could be useful.

 

[Argentum 05]

You realize this is exactly bias? You rejected a high probability explanation because you 'understood and rejected' it?

No. If that's how you understood my answer, then it's an incorrect translation. I didn't reject it, I just put it aside. I understood, accepted, and began considering another possible line. There are two alternatives. One is clear. The other isn't.

This isn't the first time I've encountered Google Translate's inability to translate from English to Russian and vice versa completely correctly. Accents are often lost, and the meaning can change, even to the opposite.

I sincerely hope that the politicians negotiating have more competent human translators...

 

[stony2275]

This is stunning performance across the board, lots of power, and those load tests are impressive. A couple of years ago it was inconceivable to have all this goodness for 380€. Kudos to chinese engineers.
I value this as the best price/quality ratio amplifier in the market today if you are looking for high power.

This is kind of a no brainer as the 3e Audio A7 TPA3255 is $255 on Amazon with a power supply. Am I missing something?

​

 

[Mort]

No. If that's how you understood my answer, then it's an incorrect translation. I didn't reject it, I just put it aside. I understood, accepted, and began considering another possible line. There are two alternatives. One is clear. The other isn't.

This isn't the first time I've encountered Google Translate's inability to translate from English to Russian and vice versa completely correctly. Accents are often lost, and the meaning can change, even to the opposite.

I sincerely hope that the politicians negotiating have more competent human translators...

Gotcha that makes sense.

This is kind of a no brainer as the 3e Audio A7 TPA3255 is $255 on Amazon with a power supply. Am I missing something?

​

I own one. It's the only thing I would buy short of hypex.

 

[stony2275]

Gotcha that makes sense.


I own one. It's the only thing I would buy short of hypex.

I have 2 Hypex mono-blocks! I am debating getting rid of an older Red Dragon M500 and replacing it with the A7.

 

[peng]

This is kind of a no brainer as the 3e Audio A7 TPA3255 is $255 on Amazon with a power supply. Am I missing something?

​

Does it come with the 5 A PS or 10A? If 10A then it is a very good deal.

 

[stony2275]

Does it come with the 5 A PS or 10A? If 10A then it is a very good deal.

Hmmm, 5A. I guess I can upgrade if I need to. Will there be an issue with the 5A? I'll be using it with 2 Magnepan DWMs between 2.5-4 ohms in a small room. Guess I'll find out soon enough as they arrive tomorrow. The Magnepan Mini satellites will be running from Hypex amps.

 

[stony2275]

Gotcha that makes sense.


I own one. It's the only thing I would buy short of hypex.

5A power supply or the 10A upgrade?

 

[Mort]

5A power supply or the 10A upgrade?

I have the 10A upgrade. Although 2x5As might have been better.

 

[peng]

I have the 10A upgrade. Although 2x5As might have been better.

If you have the mono, I would say 2X5A is better than 1X10A because then you don't need that filter thing. For the stereo, 10 A is better than the 5 A that they typically shipped if order from Amazon, but the 5A one should be adequate in most cases. According to 3 e, the 5 A brick has very good short term overload rating.

 

[Mort]

If you have the mono, I would say 2X5A is better than 1X10A because then you don't need that filter thing. For the stereo, 10 A is better than the 5 A that they typically shipped if order from Amazon, but the 5A one should be adequate in most cases. According to 3 e, the 5 A brick has very good short term overload rating.

Yeah, Stereo A7 with the 10A for a pair of BMR monitors that can dig low sometimes.

 

[Argentum 05]

Hmmm, 5A. I guess I can upgrade if I need to. Will there be an issue with the 5A? I'll be using it with 2 Magnepan DWMs between 2.5-4 ohms in a small room. Guess I'll find out soon enough as they arrive tomorrow. The Magnepan Mini satellites will be running from Hypex amps.

The A7 on AliExpress can be purchased with or without power supplies, and you can also select power supplies separately if desired.
I bought a set of two A7 mono units and ordered two 10A power supplies separately.
I believe it's always a good idea to have some extra power.

 

[DrTom]

Hmmm, 5A. I guess I can upgrade if I need to. Will there be an issue with the 5A? I'll be using it with 2 Magnepan DWMs between 2.5-4 ohms in a small room. Guess I'll find out soon enough as they arrive tomorrow. The Magnepan Mini satellites will be running from Hypex amps.

See how you go but the 5a supply is coping fine with my ESL57s down to 2ohms, albeit I don't play very loud.

 

[peng]

I believe it's always a good idea to have some extra power.

Of course, if you don't mind spending more, and have the extra space for the extra that wouldn't do anything for you. In this case, the mono amp itself just can't take advantage of the 10 A bricks except in some rare occasions it might make a minute difference that wouldn't be audibly noticeable.

 

[Argentum 05]

Of course, if you don't mind spending more, and have the extra space for the extra that wouldn't do anything for you. In this case, the mono amp itself just can't take advantage of the 10 A bricks except in some rare occasions it might make a minute difference that wouldn't be audibly noticeable.

I bought it before New Year's. There were good discounts.
The price difference wasn't big. Compared to how much my wife spends on coffee beans...
Besides, I sometimes listen to rock music quite loudly. If the manufacturer offers these power supplies, there's a good chance their power will be in demand.
Also, these power supplies are compatible with my lighting equipment for video shooting. It's useful to have a backup power supply at home in case of a breakdown.

Maybe it's not right, but I always try to buy power supplies with at least 30% more power. I did the same when building my work computer, and I didn't regret it when I had to replace the graphics card with a more powerful one. My computer's power supply was perfectly prepared for such an upgrade.
Although, of course, this is an individual matter, and everyone should decide for themselves what's best for them.

 

[Svend P]

Both lines equally lead to the biamping setup I currently have

I hate to be that guy, but biamping is also a waste of time

Bi-amping 101

This article provides a quick look at how bi-amplification works. The conventional scheme is to split the signal into two frequency bands before the power amplifiers that drive the speakers. The bass (LF) amp sees only LF signals and drives only the LF driver (woofer). The treble (HF) amp sees...

www.audiosciencereview.com

 

[peng]

Besides, I sometimes listen to rock music quite loudly.

That is a good reason to select the 10 A power supply!!

If the manufacturer offers these power supplies, there's a good chance their power will be in demand.

That could be true, but I guess only in isolated/rare use cases so I wouldn't say there's a good chance as such. The manufacturer, 3e Audio, actually suggested there's nothing to worry about for the A7 mono, but again, you do have an excellent reason so, imo the 10 A PS is the right choice for your use case.

Below is the reason they had given, for not making the 10 A supply available from their own website, but as we all know, it can be purchased elsewhere.

https://www.audiosciencereview.com/forum/index.php?direct-messages/5-a-versus-9-or-10-a-power-supply.38453/#convMessage-265688

Here's what was said in response to a question on availability:

Sorry the 52 V/9 A is not available due to only few people need these high power supply, the cost will also getting higher is MOQ is less than a normal purchasing.
the reason why we provide 5A is that it is good enough for Mono output, the maximum, output power is 1.75x of 5A,result in 48x8.75A=420W,that is nothing to worry about the power for a mono channel.

 

[Argentum 05]

I hate to be that guy, but biamping is also a waste of time

Oh, thank you))) I know all about that. I know I'll only get minor improvements from passive bi-amping. Specifically:
1) only amperage gain, not voltage gain.
2) the effect of feedback from the low-frequency band on the highs will stop.

But I'm interested in experimenting with this.
Besides, I mentioned above that this will most likely be an intermediate option. I'm aiming for multi-amping, with active crossovers before the amplifiers.
With this option, the benefits will be more significant

 

[Argentum 05]

Here's what was said in response to a question on availability:

If so, then there really isn't much point in buying a 10A power supply for the A7 mono.

But the price difference really was negligible.

I bought a set of two A7 mono units, without power supplies. And two 10A power supplies separately.

It cost almost the same as if I'd bought two sets of A7 units with 5A power supplies.