They were ripped from standard audio CD's using ez cd audio converter.
Ripping them at such a high rate is somewhat of a test since the cd rates of the source discs are 16/44k.
However, other audio formats can provide 24bit source.
What is preventing these from copying over to the iPad via iTunes.
iPad (4th gen) Wi-Fi, iOS 6.1
The iPad Music app will not play music beyond CD quality so iTunes will not sync them but will play them on the host Mac. Be sure to change the Midi setting. It is the utilities folder under applications.
Try another audio app for the iPad. VLC will play high definition FLAC files but I'm not sure about AIFF high defintion files.
Try dropping down to 96khz or 48.
Why don't you use Apple Lossless Encoder in iTunes. The differences between lossless encoders is imperceptible, so use the one that is guaranteed to be uploaded into your iPad. However, remember, each song is going to be around 60MB, so you aren't going to be able to store that many on your iPad.
Sorry that this is so late. Converting CD quality material to high definition audio formats like 96KHz/24 bit will not improve the audio quality. The source music must have been saved at the higher definition.
Very good point about the differences in the lossless formats like AIFF, FLAC, and Apple Lossless. That is their point: to save exactly what is in the music. Apple Lossless and FLAC need to expanded by thier music player before you hear the music. I have a 2005 iBook that runs FLAC into my HiFi system with no problems. FLAC will not play in iTunes. Vox and Decibel will play FLAC files directly. Vox is free and in the App Store. Decibel is about $35 and in the App store. Both applications will change the sample rate to match the music.
On the iPad try FLAC Player. It is about $10 and it will play high Def FLAC music and change the sample rate if you are playing on external DAC through the camera connection kit and a powered USB hub. There is another, free version that has a similar name and icon. I wasn't happy with it.
There are other music players in the iPad/Pod/Phone App Store but they may use the iPad internal audio and that will down sample to 41.1 or 48 KHz. You can't tell truly unless your DAC shows the sampe rate of the incoming music.
24 bit 192 kHz Apple lossless files cannot be copied to iPad 4 because it can't play these files
