@ghasley I simply found important to clarify to @noske, the user that called in AGD (and Atmasphere) implying a possible lack of experience (compared to Purifi) on the matter of technology, specifically on Class D and Silicon. I brought to his attention what the fact are. Is it something that is not allowed in this forum?
Atma-Sphere Class D… Amazing
Today I picked up my Atma-Sphere Class D Amps. These aren’t broken in yet. And they are simply amazing. I’ve listen to a lot of High End Class D. Some that cost many times what Atma-Sphere Class D costs. I wasn’t a fan of any of them. But these amps are amazing. I really expected to hate them. So my expectations were low. The Details are of what I’ve never heard from any other amps. They are extremely neutral. To say the realism is is extremely good is a gross understatement. They are so transparent it’s scary. These amps just grab you and suck you into the music. After I live with them some and get them broken in. And do some comparisons to some other high end Amps Solid State, Tubes and Class D’s, also in other systems I’ll do a more comprehensive review. But for now, these are simply amazing amps.. Congrats to Ralph and his team. You guys nailed on these.
Showing 9 responses by aw-agd
@kuribo Yes, really. As I said it is physics, not a matter of opinion. However you are absolutely right about the implementation issue. GaN Mosfets are much more challenging to use in order to take full advantage of the intrinsic superior performances. Without a deep knowledge of the device physics and experience with the device package mechanical issues, stray inductance, gate drives and overall layout, any improper implementation can demise terribly the electrical and sonic performances. But that it is also true in general since the same argument applies to the implementation of circuits with Tubes, Bipolar devices, Silicon MOSFET, in ClassA, B, C,D, E, F, G, H amplifiers (all topologies of amplifiers). Hope my answer is helping in clarifying a bit more the subject. |
@noske I want to assure that at AGD we are confident to provide the most advance technology with all our designs. Personally, and to dissipate your doubts, I have been working on Class D since 2001 and on GaN technology since 2005. With all due respect, Silicon Mosfet cannot compete in performance nor on future FOM (Figure of Merit) improvement with GaN based semiconductors, it is not a matter of opinion, it is physics. |
You are welcome anytime to visit us at the next Audio Show and listen to our amps and then corroborate or revisit your assumptions. However as a matter of curiosity, is there a reason why in your peculiar selective cut&paste exercise you decided to omitt what in the same article the reviewer wrote about the sonic qualities and his personal experience about the sound?
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@kuribo ...well...and that is my last comment on Audiogon, you may want to consider the fact that all amplifiers regardless the manufacturer/topology/technology will sound "differently" if one changes the load (i.e loudspeaker). That is why it is better to have a direct use of the auditive sense we humans are equipped with, to chose what one likes more. Finally, for all my audiophile colleagues that still prefer reading numbers instead of listening music, I would like to remember what Galileo said "...eppur si muove.."; a very profound statemwnt despite the grave situation in which he was forced in. However, for all you, next time you may pass-by Firenze, I suggest to visit the Galilean Museum and ponder a bit when in front of the glass ball containg Galileo's hand (really, his right hand) and decipher what message he left to the posterity by using the effect of the rigor-mortis of his hand. All the best. |
@atmasphereRalph, I am sorry to intervene again; your statement is wrong. I understand the decades of experience in Vaccum Tubes and amplifiers based on that technology; I know and respect your knowledge in that field, but please do not make statements that are so generic and fundamentally incorrect on the specific. There is not "a batch with low output capacitance" behind what we do; it is not a trick or lucky result; it is a real device explicitly designed to perform at best in a Class-D application, and no, of course not, it is not just the "output capacitance" that makes it ideal. I understand you are trying to pass a GaN System circuit as state of the art; business is business, I understand that too, but please DO NOT COMMENT with an inaccurate and disarming simplistic statement about what we do, what we use, why we do it and how we use the component of the power stage of the AGD 100% designed amps. We will appreciate highly the courtesy. And again, if you wish to talk and understand more about how a GaN MOSFET, like every power semiconductor device, is an APPLICATION-SPECIFIC technology product, call. Thanks |
@dseltzSorry, Sir, but your statement is wrong. The semiconductor industry invests $'000 million yearly in application-specific optimization of MOSFET products (Si, GaN, or SiC). So, as a simple anecdotal example (and I am embarrassed to write this basic one), while your light switch belongs to the category of light switch, you can't use it to turn on a high-voltage circuit or a high-current device. It still amazes me to see how high the level of misinformation is and how profound the lack of knowledge on a specific technical and scientific subject is, yet still not enough as a barrier to prevent one from making baseless generic statements and trying to pass them as true. |
@atmashere Ralph, I apologize; I did not mean to be rude or disrespectful. Sometimes, the Italian2English module installed in my cortex shows evidence of age and the need for an upgrade. Sorry for that, it was made in the last century. I just tried to share that the subject is more complex than it may seem. In any case, I am open to continuing the phone conversation and avoiding the potential misunderstanding of using a post like this. Thank you |