The best ever iPod (for sound quality) was the 5th generation ‘Enhanced’ version. But it has the same Apple model number as the 5th generation (A1136) . Here’s how to tell a 5th Gen ‘Enhanced’ iPod apart from a standard 5th generation iPod.
Everymac is a great source of information on different mac models. According to Everymac the only way to tell the 5th gen ‘Enhanced’ apart from the 5th gen is that it has a ‘Search’ option in the software. The exception is that all the U2 iPods were ‘Enhanced’ so if you have a Black and Red ‘U2′ 5th gen iPod it is enhanced!
Click on ‘Music’ and look right down the bottom under ‘Audiobooks.’
The ‘Enhanced’ 5th Gen iPod has a ‘Search’ function at the bottom of the music menu.
This identifies it as the best ever iPod!
It will look like this: