[Blu3m00nMCFC]

Any degradation in sound when listening to tidal on wifi? I had an N6ii and it was terrible when streaming tidal compared to being plugged in to the usb as a dac

Sounds fantastic to me via Tidal

 

[Joe Bloggs]

Ok it looks like I am getting some headway with getting to the inner workings and customizations available for the Darwin system like an actual member of HiBy



Like uploading my own AA filters to it

 

[hemtmaker]

Ok it looks like I am getting some headway with getting to the inner workings and customizations available for the Darwin system like an actual member of HiBy



Like uploading my own AA filters to it

I still dun understand what they mean

 

[14christ]

I still dun understand what they mean

Let your ears do the work

 

[loplop]

Ok it looks like I am getting some headway with getting to the inner workings and customizations available for the Darwin system like an actual member of HiBy



Like uploading my own AA filters to it

That is AWESOME. We can get some “Joe” filters, when?

OK let’s start with identifying what’s there today using the measurements we now have at hand.
Darwin Default: Standard linear phase fast filter
Darwin 1: Linear phase super fast filter
Darwin 2: exact same filter as Darwin 1? Or maybe it wasn't on the frequency response graph.
Darwin 3: Linear phase slow filter (~-5db at 20khz)
Darwin 4: Linear phase slow filter #2 (~-3db at 20khz)
Darwin 5: ? This one looks like some sort of NOS-approximation filter ?
Darwin 6: Brickwall filter
Darwin 7: I don't see this one on the frequency response graph. Some sort of linear phase again based upon impulse response.
Darwin 8: Linear phase slow #3 (super slow, ~-5db at 20khz, slower than Darwin 3)
Darwin 9: Some sort of hybrid linear phase?
Darwin 10: Minimum phase slow, with pre-ringing vs. normal MP post-ringing
NOS looks like true NOS

 

[loplop]

Any degradation in sound when listening to tidal on wifi? I had an N6ii and it was terrible when streaming tidal compared to being plugged in to the usb as a dac

Theoretically there should be no difference when listening to Tidal via the Tidal app, UAPP, or using as a DAC. In all cases, due to Hiby's DTA, the DAC receives bit-perfect audio.

I haven't listened/compared UAPP with the play store app yet. I am enjoying the native Qobuz app, don't yet see a need to put that under the microscope.

 

[14christ]

That is AWESOME. We can get some “Joe” filters, when?

OK let’s start with identifying what’s there today using the measurements we now have at hand.
Darwin Default: Standard linear phase fast filter
Darwin 1: Linear phase super fast filter
Darwin 2: exact same filter as Darwin 1? Or maybe it wasn't on the frequency response graph.
Darwin 3: Linear phase slow filter (~-5db at 20khz)
Darwin 4: Linear phase slow filter #2 (~-3db at 20khz)
Darwin 5: ? This one looks like some sort of NOS-approximation filter ?
Darwin 6: Brickwall filter
Darwin 7: I don't see this one on the frequency response graph. Some sort of linear phase again based upon impulse response.
Darwin 8: Linear phase slow #3 (super slow, ~-5db at 20khz, slower than Darwin 3)
Darwin 9: Some sort of hybrid linear phase?
Darwin 10: Minimum phase slow, with pre-ringing vs. normal MP post-ringing
NOS looks like true NOS

Got some serious knowledge there kiddo. I say kiddo cause I'm assuming your much younger than this old man.

 

[loplop]

Got some serious knowledge there kiddo. I say kiddo cause I'm assuming your much younger than this old man.

Just a grizzled old born-before-digital audiophile who may be in denial about needing reading glasses, but I’ll take that young man compliment any day. Lol

 

[endless402]

Theoretically there should be no difference when listening to Tidal via the Tidal app, UAPP, or using as a DAC. In all cases, due to Hiby's DTA, the DAC receives bit-perfect audio.

I haven't listened/compared UAPP with the play store app yet. I am enjoying the native Qobuz app, don't yet see a need to put that under the microscope.

has nothing to do with being bitperfect...but rather design introduces noise into the circuit if not properly isolated

 

[Joe Bloggs]

That is AWESOME. We can get some “Joe” filters, when?

OK let’s start with identifying what’s there today using the measurements we now have at hand.
Darwin Default: Standard linear phase fast filter
Darwin 1: Linear phase super fast filter
Darwin 2: exact same filter as Darwin 1? Or maybe it wasn't on the frequency response graph.
Darwin 3: Linear phase slow filter (~-5db at 20khz)
Darwin 4: Linear phase slow filter #2 (~-3db at 20khz)
Darwin 5: ? This one looks like some sort of NOS-approximation filter ?
Darwin 6: Brickwall filter
Darwin 7: I don't see this one on the frequency response graph. Some sort of linear phase again based upon impulse response.
Darwin 8: Linear phase slow #3 (super slow, ~-5db at 20khz, slower than Darwin 3)
Darwin 9: Some sort of hybrid linear phase?
Darwin 10: Minimum phase slow, with pre-ringing vs. normal MP post-ringing
NOS looks like true NOS

You can get them now, if you don't mind that you can't get back the original ones until I get a package of the factory standard ones (should be today)

 

[Joe Bloggs]

That is AWESOME. We can get some “Joe” filters, when?

OK let’s start with identifying what’s there today using the measurements we now have at hand.
Darwin Default: Standard linear phase fast filter
Darwin 1: Linear phase super fast filter
Darwin 2: exact same filter as Darwin 1? Or maybe it wasn't on the frequency response graph.
Darwin 3: Linear phase slow filter (~-5db at 20khz)
Darwin 4: Linear phase slow filter #2 (~-3db at 20khz)
Darwin 5: ? This one looks like some sort of NOS-approximation filter ?
Darwin 6: Brickwall filter
Darwin 7: I don't see this one on the frequency response graph. Some sort of linear phase again based upon impulse response.
Darwin 8: Linear phase slow #3 (super slow, ~-5db at 20khz, slower than Darwin 3)
Darwin 9: Some sort of hybrid linear phase?
Darwin 10: Minimum phase slow, with pre-ringing vs. normal MP post-ringing
NOS looks like true NOS

The plots for Darwin 2 overlapped with 1 and 7 overlapped with 6.

Soon as I get the filters as digital files we can see what the actual differences are between those overlapping ones.

 

[loplop]

has nothing to do with being bitperfect...but rather design introduces noise into the circuit if not properly isolated

USB has as much (if not more) potential than wifi to introduce noise. As well as clocking issues.

Of course, even reading from SD creates noise…. As does literally living in our radio-signal-infested world.

In any case, responding more to the question between UAPP and Tidal, they likely sound exactly the same.

Best answer? Pick one that flows well with your chi and go with it

 

[loplop]

The plots for Darwin 2 overlapped with 1 and 7 overlapped with 6.

Soon as I get the filters as digital files we can see what the actual differences are between those overlapping ones.

Awesome, keep us posted! Would love to finish the details on what’s here, and then install some JoeFIRs. :0

 

[Joe Bloggs]

That is AWESOME. We can get some “Joe” filters, when?

OK let’s start with identifying what’s there today using the measurements we now have at hand.
Darwin Default: Standard linear phase fast filter
Darwin 1: Linear phase super fast filter
Darwin 2: exact same filter as Darwin 1? Or maybe it wasn't on the frequency response graph.
Darwin 3: Linear phase slow filter (~-5db at 20khz)
Darwin 4: Linear phase slow filter #2 (~-3db at 20khz)
Darwin 5: ? This one looks like some sort of NOS-approximation filter ?
Darwin 6: Brickwall filter
Darwin 7: I don't see this one on the frequency response graph. Some sort of linear phase again based upon impulse response.
Darwin 8: Linear phase slow #3 (super slow, ~-5db at 20khz, slower than Darwin 3)
Darwin 9: Some sort of hybrid linear phase?
Darwin 10: Minimum phase slow, with pre-ringing vs. normal MP post-ringing
NOS looks like true NOS

Ok almost ready for prime time:
Unzip filter.zip into the folder called "filter" in the RS6 internal storage.
https://www.dropbox.com/sh/qnum5llpdzx6wc8/AACnY9po1_rCis7SSnvjTR0ta?dl=0

(but see this post for comments: https://www.head-fi.org/threads/hib...id-music-player.958878/page-114#post-16715371
and this post for latest update: https://www.head-fi.org/threads/hib...id-music-player.958878/page-115#post-16717890)

(but read on here also)--vvvvv

Each time you open the Darwin Controller page the player looks for and loads the file called "filter.json" in the "filter" folder.

I have included all the original filters in Darwin in their original order, (if you copy all the files in the zip to that folder), (new! Now with actual descriptions!) as well as added 11 of my own, 9 being filters of 3 different lowpass rates (fast, medium and slow) of 3 different phases (psychoacoustic, minimum and symmetric), and the last two being a non-lowpassed non-filter adjusted in volume to avoid in-band artifacts and a filter that measures very similarly to the NOS mode.

*psychoacoustic: our hearing masks sounds (e.g. ringing) mostly after a competing sound (e.g. impulse), however, pre-masking is not non-existent. So, I mix pre-filtering and post-filtering in a 1:4 ratio, to make the main impulse psychoacoustically best mask the ringing (assuming it can be heard at all; after all, this ringing all occurs at around 22kHz even for 44.1kHz audio).

A word to the wise, the current firmware is bugged in the sense that whenever the player resumes from pause (*usually* in the sense that the sample rate counter disappears and reappears, or changes), your Darwin filter mode selection is ignored and the first previously chosen [system default which is not on the list at all] filter is always chosen (all display to the contrary). That was why I couldn't replicate SandalAudio's review's measurements at first. So you may want to edit the json file to put your preferred filter first. Then again, that messes up the bespoke earphone presets (not that they are immune to this bug either, as far as I can tell). UPDATE: 1. changes need to be made while music is playing to take effect. 2. It appears that pressing the back button on the upper left to exit the Darwin Controller screen right after a change may sometimes "save" the new setting and prevent it from snapping back to the previous setting. (see second updated filterset for a set that lets you easily distinguish any user filter from the system default)

The flt files can be loaded as wave files via import raw data in Audacity as 32-bit signed, single channel, little endian raw data. The sample rate should be set to double your audio's sample rate (e.g. 88200Hz for 44100Hz audio playback), for correct visualization of frequency response e.g. in FFT analysis.

These are the Darwin filter frequency responses (captured directly from the digital files this time):
Darwin 1 turned out to be the same as "Default".

These are mine in terms of frequency response (remember however that each comes in 3 phase flavours. Unfortunately the two graphs are not in the same scale or even the same dB height (might fix this later)

Impulse and sweep responses as measured by a cheap 192kHz sound card are included as follows (for all filters in the list, in descending order):
https://www.dropbox.com/s/jflmew3tggkguib/impulses recorded.wav?dl=0
https://www.dropbox.com/s/b0tsl622okmmmtk/sweeps recorded.wav?dl=0

 

[loplop]

Epic, @Joe Bloggs !!

There’s a lot that is super exciting here, and a lot to digest. I’m going to have to take some time off over the holidays

Here’s something I’m really excited about: we can have filters (optimized to our preferences) for specific sample rates! dCS and likely others do this (automatically of course, but I’m fine with manual).

Great call-out on the bug. Duly noted. This does not apply to NOS switch, correct? Just NOS off, and a non-default filter selected (or earphone selection).

Thank you for all your hard work here, Joe.