using ipod as source and very low output

Hello, I just bought an ipod and connected it to my primaluna one valve amp and experiencing very low output. The cd that I was listening loudly at 9oclock position with a cdplayer is giving the half volume even if the amps volume is way past 12oclock position. Also it is very very dull.
I am using the headphone output and using the highest volume. This is my first ipod and I feel the max volume is way too low even listening with headphones. What may be the problem? a faulty ipod? wrong setup?