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Old Yesterday, 03:58 PM   #3881
ClaudeG is offline ClaudeG
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Thanks Mark, whatever you do I will follow with interest, simply incredible all what you are doing.

Re AKM, I thought that perhaps there might be some synergies linking the "receiver" AK4137, which seems SOA, with an AKM DAC flagship...

Read you soon

Claude
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Old Yesterday, 04:45 PM   #3882
IVX is offline IVX  Ukraine
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Have anyone ES9038Q2M out of band noise floor plot? Before LPF, just DAC outputs. I just tested AK4490 and found very low HF noise up to 2.5MHz, it is quite convenient to me, I can strongly simplify the LPF or even eliminate that at all. I wondering about ES9038Q2M the noise floor, how's it looks like?
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Old Yesterday, 05:19 PM   #3883
Markw4 is offline Markw4  United States
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Quote:
Originally Posted by IVX View Post
wondering about ES9038Q2M the noise floor, how's it looks like?
Don't know, but I think it must be fairly low at least compared to many older dacs. The amount of filtering I decided to use was based on listening tests. Allo relied too much on measurements and had to go back and rework the first run of Katana dacs they made to add some additional output stage filtering. The problem was discovered when maybe 2-3 of the reviewers received the first units and heard problems. Most reviewers either did not notice, or assumed the dac was as good as Allo could make it so no point in sending them feedback about a problem with the sound.

Noise can cause distortion if it intermodulates with signal, and or to the extent it is deterministic noise. In some cases HF noise can cause distortion in opamps if it becomes demodulated in semiconductor junctions.

In addition, I would point out as I do from time to time that listening for distortion is mostly a learned skill, not innate. Low level higher order harmonic distortion (or perhaps more likely, the associated IMD) can cause listening fatigue in untrained listeners, so probably worth paying careful attention to. I wrote up some tips on starting to learn how to listen about half way though a post in another thread: Improving AK4490 THD(+N) figures ...and a little more in yet another: New FIFO buffer for RPI/SBCs
Knowing what to pay attention to when listening is one thing, but any skill is improved with prolonged practice. I have found that a year is enough time to get pretty darn good at listening, but people who want to develop skill have to start sometime and not worry about how long it will take to get much better at it.

Last edited by Markw4; Yesterday at 05:29 PM.
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Old Yesterday, 10:06 PM   #3884
eziitis is offline eziitis
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Quote:
Originally Posted by IVX View Post
... I just tested AK4490 and found very low HF noise up to 2.5MHz, it is quite convenient to me, I can strongly simplify the LPF or even eliminate that at all ...
Indeed? That would be a real breakthrough.
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Old Yesterday, 10:57 PM   #3885
Markw4 is offline Markw4  United States
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How about for DSD? AKM has a recommendation regarding what to do in that case, as can be seen below.
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File Type: jpg AK4490.jpg (152.3 KB, 63 views)
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