If you connected the iPod via the earphone jack, volume is controlled from both the iPod and your system. If the volume on the iPod is low, it doesn't much matter how you crank up anything else because there isn't much signal there. The iPod should probably be set at around 70% - above that you may start to get distortion. A better idea is to connect to your system via the iPod dock (or directly from your PC) if feasible to get around the internal iPod volume control.
There have been a number of technically more accurate threads on the subject if you search the archives but, directionally, the above should be correct.
Good luck.
There have been a number of technically more accurate threads on the subject if you search the archives but, directionally, the above should be correct.
Good luck.