Originally Posted by cnstarz
my friend says that the ipod sounds like crap compared to CDs because the ipod only has a 1bit DAC as opposed to a 24bit DAC in his headunit.
The iPod does not use a 1 bit DAC, it has a stereo codec with "24 bit" multi-bit Delta-Sigma DACs.
And I don't think your friend understands how a DAC works. That a DAC is labeled 24 bit only means that it accepts 24 bit signals, it does not mean that it works with 24 bits internally.
They usually (like the one in the iPod) work with just a few bits, but at very high speeds.
So both the iPod and your friends head-unit use "24 bit" DACs, but that does not tell us anything at all about their sound.