This guy doing some good shit!
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Mike_Trueman
Addicted to Fun and Learning
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Not speaking Russian, at least I found out there are two LME49720 in DIP-8 sockets and seven(?) N5532 opamps surface-mounted.
I used to like to turn up the volume high, now I understand why. I want to hear more. Now I don't need to. I listen to a few my favorite songs again, I see a picture in front of me, with depth. Female voice, fuller, solid and smooth, very fine detail. Bass test, with Monitor Bronze 50, more control not punchy. Feel bass bounce towards me, even at low volume. Kenny G, hi goes higher and higher, like no limit. I try my best English to express my experience.
#AIYIMA10thAnniversary
#AIYIMA10thAnniversary
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Turn on English translation in the subtitles.
Finally, I try 24db/octave HPF with Monitor Bronze 50 6g, 62hz-20khz. A20 has 4 markings 60hz 80hz 120hz 200hz, and there are total 40 levels adjustments. I turn 5 clicks clockwise, ~70hz. Theoretically, cut out unusable frequency, minimize distortion. I love this function.
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solderdude
Grand Contributor
What I mean is that the manufacturer may have designed the negative feedback of this amplifier too high—it's not something I set. I feel the A20 sounds somewhat smeared when reproducing instrument harmonics and the low-end decay of drums, which sounds strange to me.
Perhaps each manufacturer sets the depth of negative feedback differently. These are just my subjective impressions, without any data to support them, but I've been comparing them for an entire afternoon.
solderdude
Grand Contributor
Have you tried this 'blind' ?
In order to determine whether or not these amps really sound different you must not know which amp is connected and should be able to tell them apart purely by sound (while not knowing what amp is playing).
Subjective impressions are just that.
It is not known how the PFFB has been done exactly and the second question would be if that would be audible and how.
In order to determine whether or not these amps really sound different you must not know which amp is connected and should be able to tell them apart purely by sound (while not knowing what amp is playing).
Subjective impressions are just that.
It is not known how the PFFB has been done exactly and the second question would be if that would be audible and how.
caught gesture
Addicted to Fun and Learning
Going to be hard to quantify any problems until Amirm does his tests and publishes the results. I’m not hearing the issues you are noticing, but I am not comparing to another class d amplifier. Differences can be imagined of course and, once imagined, hard not to hear even though they would disappear under rigorous blind-testing protocol.
After
five rounds of AB testing, I can confidently say the sound is very clean—so clean that some details seem to have been smoothed over. Especially with "Hotel California," the guitar and hand drum harmonics and low-frequency reverberation are noticeably less present compared to the Fosi, and it lacks the musical flavor of the V3Mono.
solderdude
Grand Contributor
Blind (not knowing what amp is playing) or knowing which amp is playing.
This is of paramount importance when using the ears.
There is nothing indicating the V3 mono has a 'flavor' (and is why I ask).
This is of paramount importance when using the ears.
There is nothing indicating the V3 mono has a 'flavor' (and is why I ask).
Well, perhaps it's an illusion. Whether it is or not, comparing a device with the a20 at nearly double the price is unfair.
solderdude
Grand Contributor
That is ... assuming price and performance/quality have a certain relation.
caught gesture
Addicted to Fun and Learning
The Echoic memory combined with a myriad of cognitive biases makes it very hard to trust our observations of perceived difference. This is why I would trust data sheets and measurements over sighted comparisons. If you can do an ABX test under rigorous conditions and still hear the differences, then that is an observation to trust.
I have no expectations at all from ASR's tests, because these Chinese Hi-Fi manufacturers have long known exactly how to play this game—pushing static specifications to extremely high levels.
It's just like the 4K and 8K TV market: the static specs look fantastic, every parameter seems perfect, every pixel is precisely where it should be, yet motion performance is often blurry—but there's no metric telling you that. And the worst part is, these issues can be measured, but they simply choose not to tell you.
caught gesture
Addicted to Fun and Learning
One wonders why you buy their products then. There are plenty of far more educated contributors than me when it comes to electrical engineering on this site that seem to trust ASR testing. Without wanting to offend you, but I would trust their point of view over your subjective observations on perceived differences between different amplifiers’ output.
Also, I find your comment somewhat offensive via-a-vis Chinese manufacturing. Plenty of European and American companies making absurd claims about their respective products.
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