Sonic Atrocity
500+ Head-Fier
- Joined
- Aug 4, 2009
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Well its good to know that info. thanx
Does this have an affect on playback?
Well its good to know that info. thanx
So, in short, does rockbox on the dx50 deliver a neutral response or...?
I'm sorry. I'm still learning about how all this stuff works.
Second, the post you're quoting is misunderstanding the spec sheet. When one uses an oversampling DAC, the analog low pass filter is set at maybe 1/4th the oversampled frequency, not the base frequency. So at 44.1k and 128x oversampling, the analog filter cuts on at about 1-2MHz. The digital filter handles lower frequencies, and that is adjusted to match the sampling rate. In rockbox we actually do support higher sampling rates when possible, we just restrict the playback engine to 44.1k or 48k for efficiency reasons and because higher sampling rates are generally useless given how modern oversampling devices work.
See, this makes me suspicious of rockbox, and makes me wonder if you're getting more detail, or just a boosted response in the higher frequencies.
Second, I was describing the DAC in DX50 as an adjunct to how the player operates because regardless of what Rockbox and Mango do the Wolfson DAC will cut anything above 20 kHz assuming iBasso configured it to spec.
Third, nobody oversamples 128 times base sample rate.
Fourth, 1 MHz? That's 1000 Hz. That's AM radio, not audio.
No, oversampling does not exaggerate anything. It's math. If you double the number of samples per second (2x oversampling) and then duplicate each sample then you get the same curve and thus the same analog signal out of the converter.
Rockbox is, as I've repeated written here, transparent. It does nothing to alter or modify what you hear unless you configure it to do so.
It is definitely NOT a result of boosted high frequencies. If you had to live with the DX50 from its initial release, having its sound change completely with each new firmware update, with none of them ever sounding quite right, then you would understand. The stock firmware (all of them) was a mess sonically, and never sounded much better than a Clip+
With Rockbox, all the hidden potential of the DX50 is finally unleashed. As I said previously, if you haven't heard your DX50 with Rockbox, then you've never really heard the DX50.
Maybe you are not aware with the term oversampling DAC. Basically it is a DAC that oversamples the incoming sampling rate a few hundred times then uses a relatively low bit DAC running in the MHz. Noise shaping is then used to shift the quantization error out of band. In this case, the DAC actually runs at 128*fs, so 5.6 MHz for a 44.1k input.
Okay. I see where you're coming from. You're working from 1-bit (delta-sigma?) digital to analog converters where the operating frequency of the DAC chip is relevant.
Aside from additional features, its no different than the stock firmware.
It is definitely NOT a result of boosted high frequencies. If you had to live with the DX50 from its initial release, having its sound change completely with each new firmware update, with none of them ever sounding quite right, then you would understand. The stock firmware (all of them) was a mess sonically, and never sounded much better than a Clip+
With Rockbox, all the hidden potential of the DX50 is finally unleashed. As I said previously, if you haven't heard your DX50 with Rockbox, then you've never really heard the DX50.
Does this have an affect on playback?
I've mod the WPS of AluminArt and CenterArt,
see if they work for you
(I don't have the skill to mod linux kernel, so I mod the theme to show 99% as 90% etc.)
AluminArt: https://dl.dropboxusercontent.com/u/17013940/AluminArt_Edit.7z
CenterArt: https://dl.dropboxusercontent.com/u/17013940/CenterArt_Edit.7z
Nice! I'll test them out when I have some time later today and report back