It’s a problem, before do real ABX testing, nobody can tell the result. But from the measurement, it’s there.
Somebody from ASR shows some clue and a potential solution to this issue, hope khadas can solve it fast, and give customers a guide about how to solve/avoid it.
I wonder if it’s cased by the different filters the dac is capable of doing, was reading somewhere that it can do selectable filters to change the sound
Hi All:
Our guys go to ESS Lab here in Shenzhen, and the hump issue do exist in there DAC chips, they also still don’t have a good solution at the moment.
They will update this issue to ESS Lab in USA, and yes, we will try to improve the issue on current KTB:
Thank you for this. I could not help but notice that the second graph was taken at -40dBFS, and the distortion level appears to be below -115dB, which is great. However, according to the first graph, the IMD distortion does not appear to be at its worst at -40dBFS. The worst case scenario is around -30dBFS. Would it be possible to have the second graph displayed at -30dBFS?
many dacs based on ess sabre IC do not have the hump. Ess9018 also do not show this hump. So my question is , will you fix this issue for current owners of the tone board ? If not , do you plan on a new board revision that has this issue fixed ?
in a blind abx test bench, how often will you identify which is which between a device with the disto hump and one without it just with your ears and your brain ?
We are working on the Hump issues, and we have a solution now(hope it’s right way), we will take a trial in the new engineer prototype and update here.