Support and General Use > Hardware
iPod Modification Ideas
mikeage:
--- Quote ---I think you will find that subjectivists don't get milk and cookies from the primarily objectivist core team of Rockbox.
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Does anyone else think this is a needed feature request? I've suffered without cookies for long enough, and I think there's no reason why an open source product like rockbox can't provide for the needs of it's users.
I'd cook it myself, but I'm too lazy. I think I'll just complain instead.
soap:
--- Quote from: reid on February 04, 2007, 10:56:45 PM ---And yeah im the guy going back and forth between lossless and wav like 300 times with the same song and you will all say im crazy but I heard a difference
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There isn't a difference.
Lossless and WAV send exactly the same bits to the DAC in exactly the same order.
This is the danger of non-blind testing.
The objective way to test a situation like this is blindly, as with an ABX program. I have heard the arguments, and understand the problems with ABXing hardware - but lossless/WAV is a software issue and can be ABXed with 100% confidence in the procedure.
--- Quote from: reid on February 04, 2007, 10:56:45 PM ---What I wanted to do is bypass the interal amp all together and change out the Wolfson chip for a 24bit unit so I can encode all my songs at higher resolutions.
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The difference between 16 bit audio and 24 bit audio is wholly in the potential signal to noise ratio.
With 16 bit audio you have ~96dB of signal to noise ratio. That is very widely believed to be the limit of human's ability to differentiate sources.
An audio source with 96dB to play with can accurately reproduce the sounds of a jackhammer at two meters and a person breathing at three meters, both at the same time. If you think you could hear the person breathing - you still have more bits left.
--- Quote from: reid on February 04, 2007, 10:56:45 PM --- Im really into super audio and dvd audio discs and im trying to get as close as possible.
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One of the problems with SACD and DVDA discs is that they have unique mastering. Even the dual-discs have different mastering on the CDDA layer than the "high def" layer. The only way to properly test if you can hear the difference would be to rip a SACD or DVDA's high-def layer and make two encodes - one at native samplerate/bitdepth and one resampled down to 44.1/16. Then ABX between the two encodes with a good program like Foobar2000 - making sure to resample the 44.1 one back up so that any poor hardware upsampling is accounted for.
saratoga:
--- Quote from: reid on February 04, 2007, 10:56:45 PM ---posting like what?
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--- Quote from: reid on February 04, 2007, 10:56:45 PM --- And yeah im the guy going back and forth between lossless and wav like 300 times with the same song and you will all say im crazy but I heard a difference ( extremely small had to do with the drums and synths in a song) that no one would care about but the other guys like me.
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Things like this. There is no difference. What you heard is called a placebo, and you heard it because you did not properly do a double blind test. Looking up the definition of lossless before bothering to test would have prevented you from making this mistake.
--- Quote from: reid on February 04, 2007, 10:56:45 PM ---Honestly I dont know alot about the actual makeup of electronics (internals) Im trying to learn. I mean I own home dac's but if you asked me to open it up and point out what everything was id get like 2 things right.
What I wanted to do is bypass the interal amp all together and change out the Wolfson chip for a 24bit unit so I can encode all my songs at higher resolutions.
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Several things:
1) 24 bit is completely pointless for playback.
2) You probably don't have any 24 bit source material to encode.
3) You're not going to be able to add a 24 bit DAC anyway.
--- Quote from: reid on February 04, 2007, 10:56:45 PM --- Im really into super audio and dvd audio discs and im trying to get as close as possible.
--- End quote ---
The only advantage of SACD and DVD-A is 5.1 audio, and you won't have that in Rockbox regardless, so upgrading the DAC does not help you there.
This is really what I was getting at when I asked why you wanted to upgrade the DAC in the first place. Since you've got a headphone amp, it seems really pointless. I think you should more carefully consider what you're trying to do before thinking about modding anything.
reid:
Im just looking for help and support. What do you suggest we can do to modify the ipod. I saw that you said it would be possible to upgrade the dac and that is why i posted. What headphones are you runnin just wanted to know, not attacking, and do you run an amp?
Oh and check this out
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=013&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=230087713780&rd=1&rd=1
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