Audio Science Review of Expert 200. - Printable Version +- Devialet Chat (https://devialetchat.com) +-- Forum: Devialet Chat (https://devialetchat.com/Forum-Devialet-Chat) +--- Forum: Devialet Reviews (https://devialetchat.com/Forum-Devialet-Reviews) +--- Thread: Audio Science Review of Expert 200. (/Thread-Audio-Science-Review-of-Expert-200) |
RE: Audio Science Review of Expert 200. - Rufus McDufus - 16-May-2020 Slightly confusingly though the plot done by Amir after the unit was repaired (https://www.audiosciencereview.com/forum/index.php?threads/devialet-expert-200-amplifier-dac-and-streamer-review.12286/post-399323) looks to be on the optical input as opposed to the USB input show (left graph on @Confused 's post above. Ideally though, there shouldn't be a lot of difference between the two inputs. I guess that does show the optical input isn't too shabby though. RE: Audio Science Review of Expert 200. - Confused - 16-May-2020 (16-May-2020, 09:06)Rufus McDufus Wrote: Slightly confusingly though the plot done by Amir after the unit was repaired (https://www.audiosciencereview.com/forum/index.php?threads/devialet-expert-200-amplifier-dac-and-streamer-review.12286/post-399323) looks to be on the optical input as opposed to the USB input show (left graph on @Confused 's post above. Ideally though, there shouldn't be a lot of difference between the two inputs. I guess that does show the optical input isn't too shabby though. Good spot Rufus! Checking back at ASR, I see that you are absolutely right. So, this gives us a comparison of two different inputs, with a degree of doubt as to if the amp tested via USB was working correctly. Difficult to reach a definitive conclusion from that! Interesting though, maybe the optical input does actually have lower noise versus the USB input? No reason why not. Maybe Amir is confused? Now there is a disturbing thought. RE: Audio Science Review of Expert 200. - thumb5 - 16-May-2020 Wasn't the original test (FFT) done using the analog input? That would probably explain the slightly higher noise floor. RE: Audio Science Review of Expert 200. - Confused - 16-May-2020 thumb5 Wrote:Wasn't the original test (FFT) done using the analog input? That would probably explain the slightly higher noise floor. No, but that might be confusion caused by myself in earlier posts. The very first dashboard / FFT is via USB, then there are S/N ratio measurements via analogue. I picked up earlier that the per Paul Miller's measurements via S/PDIF indicated much lower noise in comparison the analogue input, but missed the point that Amir's very first test was via USB. Interestingly, Paul Miller's measurements also show lower noise via S/PDIF in comparison to USB, which perhaps lead to my own confusion. With the input optical basically being S/PDIF from a protocol perspective, this could very well explain the higher noise floor. RE: Audio Science Review of Expert 200. - PeppaPig - 07-Jun-2020 (16-May-2020, 12:21)Confused Wrote:thumb5 Wrote:Wasn't the original test (FFT) done using the analog input? That would probably explain the slightly higher noise floor. Hi Confused, Expert can only produce 20W at 20Khz, is that means anything to real listening experience? RE: Audio Science Review of Expert 200. - Confused - 07-Jun-2020 (07-Jun-2020, 12:32)PeppaPig Wrote:(16-May-2020, 12:21)Confused Wrote:thumb5 Wrote:Wasn't the original test (FFT) done using the analog input? That would probably explain the slightly higher noise floor. I think this point was answered by others earlier in this thread. In particular see the post from @David A on page 13, who offered a far more eloquent explanation around this topic than I could. What we do know is that Devialet Experts have protection systems that cause them to shut down during certain types of high frequency bench tests. We also know that our own amps do not shut down during normal use. So as long as your own amp has not shut down recently, the answer has to be a simple no. RE: Audio Science Review of Expert 200. - Confused - 04-Oct-2020 This link was posted elsewhere recently: https://www.superbestaudiofriends.org/index.php?threads/audio-science-review-review.9827/ It was a bit of fun to read, much of it little more than a bit of bitching between forums, although there are some sensible and interesting posts along the way. Then on page 8, a conspiracy theory..... Apparently there are links between ace ASR tester Amir and the audio distribution company Aoshida. This explains everything! Well, maybe not, from what I can see there are no links, except for the odd reference to ASR for products that were favourably reviewed by ASR. This kind of thing is not that unusual and can be seen elsewhere, sometimes with links to the "established" hifi publications. No smoking gun, as they say..... Is there a touch of bias creeping in? Who knows, and we are all human, but measurements are measurements, so there has to be a limit. Anyway, make of it what you will.... Aoshida RE: Audio Science Review of Expert 200. - Decameron - 25-Nov-2023 (18-Apr-2020, 23:45)David A Wrote: @Confused David thank you for that explanation. If I can pose another scenario- Martin Logan and other similar designs have very low impedance at these higher frequencies which I assume would draw more current. Would such a speaker combination cause any other SQ or performance issues for the Devialet in practice? RE: Audio Science Review of Expert 200. - David A - 25-Nov-2023 @Decameron, I can't answer your question because I know nothing about electronics. My response above which you quoted was based on my knowledge of human hearing, I used to work in occupational health and safety before I retired and had to learn a bit about hearing protection which gave me some background on what we can and can't hear plus also a bit of background in acoustics because some of the work I did at one stage was slightly related to the acoustic treatment of telephone call centres in order to keep ambient noise levels (all of those operators in cubicles talking on the phone in an open plan space) down at a level where it didn't interfere with their ability to understand the person they were talking to. What I can say is that my first introduction to Devialet amps was when a friend with Marin Logans bought the original D-Premier for his system. It sounded great and my positive response to a Devialet in his system eventually led some years later to my buying my Expert Pro. I definitely didn't think that sound quality was an issue with the original D-Premier and one model of speaker in the Martin Logan range and I never noticed any other problems but it's not really possible to generalse from a single case. |