HiBy RS8 flagship Darwin R2R Android DAP -- Class A -- news and impressions thread

[Joe Bloggs]

what happens if i update while also having the darwin v2 filters?

From the comment of @haci , it seems everything will work fine, you will keep your v2 filters, and even get pictures of filters back, however they are pictures of the v1 filters.

 

[fejnomit]

From the comment of @haci , it seems everything will work fine, you will keep your v2 filters, and even get pictures of filters back, however they are pictures of the v1 filters.

Thanks for everything you do for us owners. The V2 filters are incredible.

 

[audionewbi]

@Joe Bloggs I think I've asked you before, but is there a guide for users to experiment with making their own customer FIR filter for their favourite IEM, the same way the IEM makers are doing it under the Darwin ecosystem prior to submitting to Hiby for implementation?

 

[Joe Bloggs]

@Joe Bloggs I think I've asked you before, but is there a guide for users to experiment with making their own customer FIR filter for their favourite IEM, the same way the IEM makers are doing it under the Darwin ecosystem prior to submitting to Hiby for implementation?

Hi audionewbi,

The IEM makers are choosing between the FIR filters HiBy made for V1 and I made for V2, in their presets. Not submitting their own. However, you can design your own filters and put them directly into the Filter folder for implementation. A complete tutorial for making one is beyond the scope of this discussion but here are some tips:

1. the filters for RS6 and RS8 should be 256 samples long.
2. nominally, they should let through frequencies up to 1/4 the sample rate and reject those above this.
3. you can save a file (of the right length, 256 samples) into a format compatible with the system in Audacity by exporting the file as "Other uncompressed files"->Header: RAW (header-less) and Encoding: Signed 32-bit PCM. Then, rename it to the same name as one of the existing .flt files and place it as one of the files in Filters to use your file as the filter, for the number chosen.
4. you can load an existing .flt file for inspection in audacity by choosing Import->raw data... and following the following format:

(the sample rate doesn't actually matter, but is useful to set at 88200, to visualize frequency response correctly with the right settings in Plot Spectrum (which are beyond the scope of this discussion). At least, they will be correct when the system sample rate is 44100.
5. you probably want to devise some function in e.g. matlab to design the filters rather than use any usual audio editing tools.
6. the filters are designed to do anti-aliasing of oversampling, not shape the FR around the response of earphones. For that, you probably want to design an FIR impulse for the Convolver in system plugins instead.

Cheers,
Joe

 

[Froller]

Судя по комментарию @haci , кажется, что все будет работать нормально, вы сохраните свои фильтры v2 и даже получите фотографии фильтров обратно, однако это изображения фильтров v1.

Hi audionewbi,

The IEM makers are choosing between the FIR filters HiBy made for V1 and I made for V2, in their presets. Not submitting their own. However, you can design your own filters and put them directly into the Filter folder for implementation. A complete tutorial for making one is beyond the scope of this discussion but here are some tips:

1. the filters for RS6 and RS8 should be 256 samples long.
2. nominally, they should let through frequencies up to 1/4 the sample rate and reject those above this.
3. you can save a file (of the right length, 256 samples) into a format compatible with the system in Audacity by exporting the file as "Other uncompressed files"->Header: RAW (header-less) and Encoding: Signed 32-bit PCM. Then, rename it to the same name as one of the existing .flt files and place it as one of the files in Filters to use your file as the filter, for the number chosen.
4. you can load an existing .flt file for inspection in audacity by choosing Import->raw data... and following the following format:

(the sample rate doesn't actually matter, but is useful to set at 88200, to visualize frequency response correctly with the right settings in Plot Spectrum (which are beyond the scope of this discussion). At least, they will be correct when the system sample rate is 44100.
5. you probably want to devise some function in e.g. matlab to design the filters rather than use any usual audio editing tools.
6. the filters are designed to do anti-aliasing of oversampling, not shape the FR around the response of earphones. For that, you probably want to design an FIR impulse for the Convolver in system plugins instead.

Cheers,
Joe

Joe,
could you please tell us if there is an option to add icons for custom filters?

 

[Joe Bloggs]

Joe,
could you please tell us if there is an option to add icons for custom filters?

I haven't been told of any option to add pictures of custom filters, no. You can name them by editing the filter.json file.

 

[elementze]

2. nominally, they should let through frequencies up to 1/4 the sample rate and reject those above this.

Hopefully this isn't going too far down a rabbit hole, but why 1/4 sample rate? Anti Aliasing filters usually go to 1/2 sample rate.

 

[gryphonos]

From the comment of @haci , it seems everything will work fine, you will keep your v2 filters, and even get pictures of filters back, however they are pictures of the v1 filters.

I had updated the V2 filters before and now performed the recent update but I do not see any picture of any filter and haven't so before.
Any recommendations?

 

[haci]

I had updated the V2 filters before and now performed the recent update but I do not see any picture of any filter and haven't so before.
Any recommendations?

I was in that situation and I deleted the folder ‘filter’ and pictures showed up. Please note that are pics of v1

 

[fullbass]

I do not see any picture

Do you want images that don't match the filters?

 

[Joe Bloggs]

Hopefully this isn't going too far down a rabbit hole, but why 1/4 sample rate? Anti Aliasing filters usually go to 1/2 sample rate.

1/4 sample rate because the audio has been oversampled to 2x FS by the time it reaches the Darwin AA filter (the part we can freely design). This is normal for an oversampling system and does not introduce any changes to the audio, unlike resampling.

This is what mfcs refer to when they say that the audio has been e.g. 128x oversampled. The final oversampling ratio of RS6 / RS8 is 16x of 44.1 / 48kHz.

If you don't oversample before filtering, it makes no sense (by definition PCM does not represent any sound above 1/2 sample rate anyway, but you can't play it back without aliasing artifacts above 1/2 sample rate, hence the need to oversample and then filter)

 

[elementze]

For any UAPP users out there, the latest Beta Channel release of the app properly supports both 32x PCM (1411/1536kHz) and native DSD1024. I've been working with the app developer to get it running at these max data rates. Nice to have this app running properly on the RS8.

 

[audionewbi]

On my Hiby, Neutron sounds much better than UAPP, but I do like UAPP Quboz integration. If the gap reduces sonically, that would be great.

 

[elementze]

Yes, Neutron sounds great!

I've been playing with PGGB upsampled PCM and HQPlayer DSD files both running at max data rate for the RS8. Neutron handles them just fine, but I don't need any of the processing Neutron provides. I mostly want the app to do nothing but provide a clean interface and obviously pass the files bit-perfect unaltered. And Neutron can do this but the interface leaves a little something to be desired. So having an alternate is nice

 

[MusicalDoc8]

On my Hiby, Neutron sounds much better than UAPP, but I do like UAPP Quboz integration. If the gap reduces sonically, that would be great.

Cause the dev set up neutron to use the driver of the DAP and not interfere with the music at all (unless you start messing with oversampling and such). This is why neutron is a must have, not to mention the ability to be installed without any play service is a HUGE bonus.