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AIGO EROS Q / AIGO EROS K / IRULU Surfans F20 / AGPTek H3 / HIFI WALKER H2

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mrsubway:
Question.  I'm currently running a Hifi Walker H2 with Native Rockbox and 1.5 stock.

Is there a way to flash 1.8 stock without having to remove Rockbox first?

In other words, I just want to update the OF without messing with the bootloader again.

I've read you can't go from 1.5-1.8 without a lot of issues.

coomer101:

--- Quote from: dconrad on May 21, 2024, 11:01:27 AM ---
--- Quote from: coomer101 on May 19, 2024, 06:48:32 PM ---I just got a surfans unit with v3.1, would be happy to provide the image/whatever else needed if you tell me how.

Also, is there any way to reduce the actual hardware gain? I kinda hate using really sensitive iems because of the hiss.
Harder to notice on stock firmware though, the audio probably completely turns off unless there's music playing.

--- End quote ---

Do you mean when something is playing, or when nothing is playing? Are you using the native or hosted port? If the native, could you do me a favor and go to System --> Debug --> View HW info --> Audio and tell me whether it says HWVOL or SWVOL? I'm just curious which method is being used.

I believe the hosted port should be using hw volume scaling inherently, and the native port should also be using the hw volume scaling unless they've changed the DAC on us again.

--- End quote ---

When nothing is playing, if its a very quiet track with very very sensitive iems I can hear the dac hiss then too.
This is a case on all my eros q/f20 models though, old and new.
This new Q unit has the native port and ES9018K2M HWVOL

dconrad:
Gotcha, I wasn't sure if that was a new thing with the new hardware or not. You could try an attenuator, I know there's at least one off-the-shelf one out there, but I think it's kinda expensive for what it is. I actually made one myself for my big headphones to hook them up to certain equipment, but it's hard to make that kind of thing small enough to not be awkward to carry around.

In any case, to my knowledge that's just the noise floor of this design unfortunately.

Bilgus:
Sometimes if you have control of the underlying hardware you can take them out of powersave modes or change switching frequencies or raise voltages to minimize noise.

Id assume the product designers used the best tradeoff but you might disagree..

dconrad:
I suppose there is a THD+N compensation feature in the DAC that we're not using. It requires hooking up to some measurement equipment and tuning it by hand. If the designers went through the trouble of doing that (I kind of doubt it?), it would probably be possible to find that information in the decompilation of the original firmware. I definitely don't have the time or energy to do that at the moment, though.

coomer101, if you haven't yet, you could try playing with the Dithering feature too, that might be a positive improvement: https://download.rockbox.org/daily/manual/rockbox-erosqnative/rockbox-buildch6.html#x9-1130006.11

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