Would be interesting to see what this would do with balanced to SE cables hooked up instead of SE -> SE input.
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AIYIMA A70 Stereo Amplifier Review
- Thread starter amirm
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Ah ok! Just misundertood... Btw, would never buy a product not available at the shop next door...
Most likely you will get the SE measured performance.
And I thought I was OLD SCHOOL…
daniboun
Major Contributor
As far as we know = no
AIYIMA A70
AIYIMA's latest TPA3255 power amplifier has PFFB function and is equipped with 48v5a GAN power supply. Parameter:Chipset: TPA3255+NE5532Replaceable operational amplifier chips: RT3609SM, OPA2604, OPA2134, LM4562, JRC5532, OP275GSZ, OPA1612, MUSES01/02/03...
Well yes... No need to get so frantically supplied.
No load dependency is great, but the distortion rise above 1kHz is troubling for me. I’ll stick with the PA5 and A300 for class d for now. The latter doesn’t measure as well, and has no xlr, but has better bass mgmt and sounds great.
Also, re measuring the A300 at 25db instead of 29db, may boost the measurements of the A300.
Also, re measuring the A300 at 25db instead of 29db, may boost the measurements of the A300.
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Interestingly, the A70 has better higher-frequency sweeps than the PA7 Plus, although the latter has slightly better multi-tone IMD performance. I strongly doubt you would be able to hear any difference between the A70 and the PA5, and possibly even the A300 when thrown into the mix. Except for noise, of course.
I don't see the wisdom of wrapping a blanket around an encapsulated power supply that relies on ambient convection cooling.
Slightly different angle, but I believe higher quality/spec components may benefit the reliability & durability of the amp (but not so much the performances…).
Is it always worth the premium impact on the BOM, I don’t know.
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Agree, especially RE load dependency in an active speaker: by definition the high-frequency driver being used with the amp in such an application is known, so I would imagine that as long as you pick a driver whose impedance is steady from about 5k upwards, it would be a simple matter to correct for any load dependancy-based FR nonlinearities using DSP or even just a simple PEQ shelf. I would guess this is especially true since in the audible range most of the impedance-based FR peaks or slopes we see with these amps are usually about 1.5dB or less.
Because, apart from Amazon, there are only 1-2 EU dealers. Almost fixed prices, no sales, no Black/Cyber days, no coupons, no stock clearances, etc...Don't understand the custom fees issue... Why bother with making yourself an importer? Just buy to a local seller and you are done... Will also benefit with waranty rights that global piratry will always negate ..
I like the warranty and the customer support they offer. I personally buy from them. But they don't offer free shipping to my country.
I truly understand the people that take a chance and import it themselves if they're on a budget.
Now, considering the A70, I'm disappointed. It's obvious that they rushed things and cut corners. Maybe competition with Fosi?
RCA performance is a no-go for me. Even XLR one is just good enough. Perhaps something with the input signal routing or PSU filtering...
I'm going to buy a good D class amp till Summer...
I hope the competition can give a decent PFFB XLR amp at 200 euros final price in EU.
I'm not listening at high volume. My bookself speakers are 90db sensitive so wattage is not a real issue. I'm interested in the cleanest possible performance and channel separation.
So far, the PA5 II seems to be the logical choice for me...
@amirm thank you for your hard work and coping with our ... temperament!
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Voted “fine” although if price were a consideration for me, I would have voted “great.” As is, it has excellent performance but is shy of the SOTA. But again, great price.
Ze Frog
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I use them for power bricks that are always on, no issues so far. Admittedly it likely lowers the lifespan for things that generate a lot of heat. To be honest though the power brick I have that creates the most heat is the one with my HP laptop, and that one has no ventilation anyway so if it's good enough for that to not have ventilation then don't see the problem. Plus, these things are air tight, it's a balance really between fire safety or longevity. Personally I'd rather replace a power brick than the entire contents of my home.
Maybe I'm a bit paranoid with that kind of thing,but I prefer to play it safe. I also replace phone charging cables etc as soon as the bit by connector shows any signs of wear. Those USB cables once damaged can be an easy source of potential ignition.
Air tight is not the factor in the cooling of these devices. The cooling is occurring by radiating the heat and not by air flowing/convection. I ask you to please enable air easy access to the devices and you will be served well that way. The life expectancy of devices is lowered by like 70% or something like that for every 10C rise in temperature.
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What if you start a fire because something was wrapped up and couldn't cool down?
Yeah, you could get a PA5 II, but I'll laugh when you try to return it.
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In the other thread where this is being discussed, @AIYIMA:GUO responds directly:
(Direct link to that post in the other thread: https://www.audiosciencereview.com/forum/index.php?threads/aiyima’s-tpa3255-pffb-based-amplifier-coming-soon.51188/page-9#post-1910756)
Re-reading @amirm 's relevant comment on page 2 of this thread here, he writes:
This does not say that Aiyima "asked Amir not to test the 48/5A" PSU. It says they asked him to test with the 48/10A supply.
It could be that Aiyima is lying and asked him to test the amp only with the 10A PSU - but in that case it would be strange that they'd send him both. And it would also be strange that they would needlessly return to the discussion in the other thread to tell this lie in response to one of your many posts about this, instead of just letting it be.
It could be that Amir is lying and Aiyima did not ask him to test with the 10A PSU - but that would be a bizarre lie for Amir to tell and there's zero motivation he'd have to tell such a lie.
Or, it could be that something was lost in communication here. No offense at all to Aiyima, but from reading their comments in this and the other thread, it is clear that their English fluency is good but not perfect. It's entirely possible that they told Amir that they wanted him to include tests with the 10A PSU - or else why would they have sent it to him? - but they didn't mean that they wanted him to only test that PSU and not the other one. It's also possible that they clearly said that he should feel free to test both PSUs but they requested that he include the 10A PSU, and he felt like he would only do the 10A one for the reason he's repeatedly cited in multiple comments here: it's only $30 more and he doesn't view that as significant.
To my eyes it's obvious which of these three possibilities is the most likely explanation. And if we want more clarity and a definitive answer, I'm sure we can get that without making accusations or insinuations of dishonesty or sketchy behavior.
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