The ONLY way to do this and get great sound quality is using a digital dock, not using the analog outs from the iPod.
I second the Pure i20. I have one and its amazing for the price. The analog outs from it are fantastic,but can be bettered by taking the digital out and reclocking with a Synchro-Mesh. Then drive to a good DAC like a Metrum Octave or maybe the new Mytek. Total outlay about $1700 including S/SDIF coax cable and even less if you buy the DAC used.
Steve N.
Empirical Audio
I second the Pure i20. I have one and its amazing for the price. The analog outs from it are fantastic,but can be bettered by taking the digital out and reclocking with a Synchro-Mesh. Then drive to a good DAC like a Metrum Octave or maybe the new Mytek. Total outlay about $1700 including S/SDIF coax cable and even less if you buy the DAC used.
Steve N.
Empirical Audio