Yes. You can listen to the music stored on an iPod on your NAD stereo system. Depending on which NAD amplifier or receiver you have, the NAD IPD-2 Dock for iPod is available and can be connected to your system for audio output to stereo speakers.
If your NAD system has an auxiliary input, use an extension cable with 3.5 mm stereo connectors on each end to connect the iPod directly to your system's 3.5 mm headphone jack.
As per Apple, for optimal sound quality when using external speakers, set the iPod volume at less than half the maximum output and adjust your listening volume through your stereo controls. This prevents over-amplification, which can cause distortion and reduce audio quality.