Iphone and DAC question
I am thinking of getting a DAC so my gf can use her iphone with my stereo (I only listen to vinyl). Keeping in mind that all her music is compressed to 128 kbps, I have a couple questions...
If the DAC has 3 inputs- USB, coaxial, and Toslink (I am considering the Jolida FX DAC), and the USB upsamples at 24/96, and the other two are at 24/192, should the coaxial or Toslink sound better than the USB?
And, what cables can I use to bypass the Apple DAC and connect to the external one? I read that Apple makes it difficult to bypass the internal DAC.
Oh, and I realize 128 kbps mp3's will sound crappy either way... I'm just trying to make the most of it.