I apologize if this message should have been posted elsewhere. I couldn't find a "Complain about X measurements" thread, as we see with headphones or speakers.
The Fosi V3 measurements provided by Amir did not highlight a defect that was nevertheless observed in the measurements offered by Scientific Audiophile (video, from 20:00).
S.A. discovered that the Fosi V3, when heavily stimulated, exhibits irregular response across the frequency spectrum. The main issue is that it noticeably collapses below 145Hz, whereas this problem is not observed beyond that point. Here is his graph comparing the V3 to a more traditional class AB amplifier :
I suggested to S.A. to conduct another test to verify his hypothesis that this result can be explained by the fact that low frequencies require more power. He seemed interested. These questions have been discussed here and in the comments section of S.A.'s video.
Therefore, it seems to me that tests should include a power test conducted across the entire audible spectrum. The frequency response appears to be subject, in addition to load dependency, to a "Watts dependency" (?).
I am clearly new to this field. Did Amir's measurements allow for the prediction of this defect in a way that I am unaware of?
I am already very grateful for the time Amir is willing to take to collect and make so much interesting information available to everyone. But we should not miss an opportunity to improve the protocols if they have indeed fallen short.
The Fosi V3 measurements provided by Amir did not highlight a defect that was nevertheless observed in the measurements offered by Scientific Audiophile (video, from 20:00).
S.A. discovered that the Fosi V3, when heavily stimulated, exhibits irregular response across the frequency spectrum. The main issue is that it noticeably collapses below 145Hz, whereas this problem is not observed beyond that point. Here is his graph comparing the V3 to a more traditional class AB amplifier :
I suggested to S.A. to conduct another test to verify his hypothesis that this result can be explained by the fact that low frequencies require more power. He seemed interested. These questions have been discussed here and in the comments section of S.A.'s video.
Therefore, it seems to me that tests should include a power test conducted across the entire audible spectrum. The frequency response appears to be subject, in addition to load dependency, to a "Watts dependency" (?).
I am clearly new to this field. Did Amir's measurements allow for the prediction of this defect in a way that I am unaware of?
I am already very grateful for the time Amir is willing to take to collect and make so much interesting information available to everyone. But we should not miss an opportunity to improve the protocols if they have indeed fallen short.
