Support and General Use > Hardware

X5 total audiophile remode. BIG Question for the programmers- authors of builds.

<< < (3/3)

GodEater:
I think you really have to accept that you're the only person interested in this. I certainly have no interest in improving the sound quality of my DAP - it's perfectly acceptable to me as it is.

Alex_Nsk:
Hi for all HEAD-FIERS!!!
1st July is the birthday of my aleXmod audiophile project.
It is a cowon X5L in which second battery was detached and in it's place new plate with audiophile DAC+AMP combo was installed.
My aleXmod sounds just terrific good with Senn HD580 headphones, but with my second (portable) pair of Sleek-Audio SA-6 it is too much loud (aprr 200mW per Chanel I estimate)
So I must to decrease a volume in digital domain by appr -12..-16dBs depending of the material (it is easy to do with eq enable and use "pre-cut" for this)
I dislike a possible degradation of sound due to rounding errors  when downsamplin 32bit words to the 16 bit PCM.
So could anyone interested in my project help me with solving of such software limitation and made a built in which  from CPU goes 24bit PCM to the DAC circuit. For doing this I could sent a plate for this hardware mode
as a present...
By the way, I have some such plates for DIYers if anyone interested - just write me!

macgeek417:
Honestly, while I can tell the differance between a 128k and 192k mp3, I don't see why one would waste disk space with FLAC or anything.

And you are worried about 32-16 bit downsampling? I thought CDs were only 16bit 44.1khz PCM audio, so what's the point of a 32bit audio file?

Alex_Nsk:
Inside X5's CPU all digital audio words presented in 32 bit format: 16bits of DATA + 16bits of nulls in LSBs. When performing DSP function such as EQ, PRECUT, CROSSFEED etc this words could be multiplied and divided by different digits. So when performing such operations (decreasing the volume in PRECUT for example) a part of DATA bits shifted down in 32 words (just below upper 16 bits). And after rounding such words from 32bit format  to the 16 bit format we have a DATA stream in which all LSBs is just neglected. Such lossless MUSIC sounds MP3 alike with the absence of all microdetails. Just lifeless
By the way, my project  stay alive, sounds GREAT! )))

Waiting for the rockbox patch when forementioned problem is solved, it will made by one of the "aleXmod" X5 owner...
If anybody interested in true audiophile sounding aleXmoded X5 - just stay tuned!

saratoga:

--- Quote from: Alex_Nsk on August 28, 2009, 12:01:35 AM ---Inside X5's CPU all digital audio words presented in 32 bit format: 16bits of DATA + 16bits of nulls in LSBs.When performing DSP function such as EQ, PRECUT, CROSSFEED etc this words could be multiplied and divided by different digits. So when performing such operations (decreasing the volume in PRECUT for example) a part of DATA bits shifted down in 32 words (just below upper 16 bits).

--- End quote ---

No internally its stored in full 32 bit, no padding required, although codecs can pad if they return less then 32 bit precision.


--- Quote from: Alex_Nsk on August 28, 2009, 12:01:35 AM --- And after rounding such words from 32bit format  to the 16 bit format we have a DATA stream in which all LSBs is just neglected. Such lossless MUSIC sounds MP3 alike with the absence of all microdetails. Just lifeless

--- End quote ---

You've been saying things like this for a while now and I guess not understanding what people are trying to say to you.  Let me be blunt:  what you are saying is absolutely a load of shit.  It makes zero sense and I'm as baffled as everyone else that you could be knowledgeable enough to modify your X5 while being so clueless about audio.  Dithering to 16 bit vs. 24 bit does not matter.  No one has added something like this because its useless.  Any loss of detail is in your head. 

Stop worrying about it.

Navigation

[0] Message Index

[*] Previous page