If you think Apple can't make a good-sounding player, think again.
The following are the results of Rightmark Audio Analyzer tests.
Source: iPod nano 7G
ADC: Lynx Studio HILO LT-TB
Computer: 2012 27" iMac
Cables: 1,5m Hosa Pro 3,5mm stereo to dual 3-pin XLR (around 8$)
NL - no load
SM2 - Earsonics SM2
ES7 - Audio Technica ES7
DT880 - Beyerdynamic DT880/600
Below is its stand-alone performance summary.