AIYIMA A70 Stereo Amplifier Review

[hmt]

A 480W SMPS brick sitting on shag rug under the sofa that doesn't catch fire and burn your house down is kinda important.

These outboard supplies are getting ridiculous- look at the "amplifier" and its power supply- it's stupid looking if you ask me.

But they have advantages. I am looking for a more powerful desktop amp to drive my KEF R3. Naturally the Apollon Audio et al amps are way bigger due to the internal PSU. They dont really fit on my desk but having a PSU on the ground would be OK.

 

[laudio]

The sub cutoff frequency looks like it was designed to work in a sound bar configuration, with tiny main speakers. Would be more useful if it had standard tone controls on the pre-amp.

 

[Sokel]

As a side note,the numbers for heat dissipation don't add up even if I include the desk the amp is on
Even if the whole case works as a heatshink still would need to be about 15 times as much and way thicker.

Do the math,I have posted the calc many times.

So go easy,specially driving corrected lows,etc.

 

[JSmith]

There is too much BS going on here... this is a review thread about the Aiyima A70;

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JSmith

 

[DavidM1]

Totally overpriced with useless features as XLR and sub out with crazy high low pass range.

My next amp will have balanced in. My DAC has balanced out.

 

[Ze Frog]

A 480W SMPS brick sitting on shag rug under the sofa that doesn't catch fire and burn your house down is kinda important.

These outboard supplies are getting ridiculous- look at the "amplifier" and its power supply- it's stupid looking if you ask me.

Something you can do to ease that worry is buy a fire resistant pouch that is commonly used for charging lithium ion batteries.

I always recommend this for any kind of power brick.

 

[BDWoody]

Many posts deleted.

Back on topic please.

We aren't debating this.

Cheers.

 

[Rottmannash]

What matters to me in the end is to understand why Aiyima explicitly asked Amir not to test their Amp with the stock 48V/5A stock PSU and therefore we are entitled to ask ourselves questions....

AIYIMA A70 Stereo Amplifier Review

- 10 Amps GaN PSU brings nothing to the table. The Fosi V3 with their "ordinary" 48V/5A PSU has more power in 4 and 8 Ohms and is cool to the touch in normal operation. I agree with this point and I think it is essential to have Amir's measurements with the Stock PSU 48/5A... so that customers...

audiosciencereview.com

I believe there is a difference in them asking @amirm to measure using the 10A power supply and them asking him "not to test their Amp with the stock 48V/5A stock PSU".

 

[T&T]

What I like of Aiyima, send products before going on sale, Fosi you have to wait several months like the ZA3, manipulating big time, how we knows, if what Fosi send to Amir is been touched with upgrades?
Like I said before I sold my Fosi V3 with 48 volts, the Aiyima07 Max sounds much better with Muses02 than sparkos ss3602. And I have another scarce opamp that sounds better than Muses02.

 

[surroundman]

What I like of Aiyima, send products before going on sale, Fosi you have to wait several months like the ZA3, manipulating big time, how we knows, if what Fosi send to Amir is been touched with upgrades?
Like I said before I sold my Fosi V3 with 48 volts, the Aiyima07 Max sounds much better with Muses02 than sparkos ss3602. And I have another scarce opamp that sounds better than Muses02.

I'm glad that I am not the only one noticing Fosi's recent marketing schemes. I hope Aiyima won't follow that.

 

[UA8890]

Sorry but I think you misunderstood me. That's exactly what I'm trying to do here, is get the full picture.

Topping has a bad reputation for being unreliable both product-wise and support-wise. Though I haven't seen many complaints about the PA7.

So I'm beginning to think that the bad rap is overblown. But really I'm just trying to decide if I should keep my PA7 or get an A70 instead...

I wrote to you privately, read it

 

[Talisman]

What I like of Aiyima, send products before going on sale, Fosi you have to wait several months like the ZA3, manipulating big time, how we knows, if what Fosi send to Amir is been touched with upgrades?
Like I said before I sold my Fosi V3 with 48 volts, the Aiyima07 Max sounds much better with Muses02 than sparkos ss3602. And I have another scarce opamp that sounds better than Muses02.

If I found even rarer op amps I'm sure it would sound even better, with more melodious mids and more refined highs

 

[Whoareyou]

Like NAD has a bad reputation. We weren't the only store that noticed how many NAD amplifiers (it was just amplifiers) were coming back. The local electronics repair that I visited a couple of years after was filled with the same NAD amplifiers I kept seeing. I asked about it, and he said they had some design flaws that made them fail more often than Marantz for example.

Also remember how NAD and Marantz and many premium brands released receivers that advertised HDMI 2.1 support, but they didn't even fully support it? I do. What a fucking mess that was to get that fixed. Talk having bad support....

I want reliability because it's a pain in the neck to return anything, but stuff breaks. Of larger concern should be the ability to return and/or get a product repaired, under warranty or out of warranty.
I wish there was some way to capture that information in the "measurement" data, but it's not really possible.

 

[shuppatsu]

If I were running ASR I would allow that term. But I’m not, Amir is. This is not a critical free speech issue. It’s a tempest in a teapot and there’s trade-offs either way.

I used the term once in a non-derogatory context and was politely asked to stop. I did. My personal freedom index did not plummet.

 

[Spocko]

Just imagine where we'll be in 3 years! It's amazing the level of performance for the price and I for one look forward to the next generation of $300 (lol with inflation) Class D amps.

 

[Ze Frog]

Just imagine where we'll be in 3 years! It's amazing the level of performance for the price and I for one look forward to the next generation of $300 (lol with inflation) Class D amps.

It certainly seems Class D has opened up a future whereby greatness can be had at extremely reasonable cost.

 

[sejarzo]

Just imagine where we'll be in 3 years! It's amazing the level of performance for the price and I for one look forward to the next generation of $300 (lol with inflation) Class D amps.

Is that a worthwhile goal for manufacturers at this point? We're already at the level of noise and distortion that's a couple of magnitudes lower than that of speakers.

Sure, load dependency with a 1 dB rise at 20 kHz looks bad on a graph, but how many users can discern it in use?

What improvements in that next generation would justify added R&D by the makers that results in audible improvement?

I'd be fine with improved reliability. Makes no sense to me to buy something from a maker that has had repeated quality issues.

 

[GXAlan]

What I like of Aiyima, send products before going on sale, Fosi you have to wait several months like the ZA3, manipulating big time, how we knows, if what Fosi send to Amir is been touched with upgrades?
Like I said before I sold my Fosi V3 with 48 volts, the Aiyima07 Max sounds much better with Muses02 than sparkos ss3602. And I have another scarce opamp that sounds better than Muses02.

the good thing is that with REW, Multitone, E1DA Cosmos ADC, and RME’s ADCs, end users can verify performance.

I echo what you say about MUSES02. Although the spec is not that great, my measurements do show that it measures well:

Measured effect of op-amp rolling on a phono equalizer input-shorted noise

Op-amp rolling the stereo x LUXMAN LXV-OT10 Background Last month, I put together a Luxman "kit" phono equalizer and posted the measurements. https://www.audiosciencereview.com/forum/index.php?threads/luxman-lxv-ot10-phono-equalizer-amplifier-review-and-measurements.48055/ TLDR? The Luxman...

www.audiosciencereview.com

 

[Multicore]

It is a design bug. There is a microprocessor in the loadbox which communicates with the PC to change the loads. As soon as I connect the ground on one channel to anything that is above zero, the box stops communicating. So the loads are fine. It is the control around it that for some reason stops working.

Yes, that does sound like a design error. It seems reasonable that loudspeakers should work with what is, iiuc, in effect differential drive from the amp. So why not a load box?

What's the connection to the PC? USB?

 

[Toni Mas]

My next amp will have balanced in. My DAC has balanced out.

Useless feature for dacs too...