My bose ipod speakers are making a knocking noise and not charging my ipod

Bose ipod speaker been turned of for a few months just plugged it in making a knocking noise is this normal

You have the SoundDock plugged in, incorrectly! You need to look and find the symbol that is on the plug end and match it with the symbol on the back of sound dock. As time goes by the plug can get a little worn down allowing it to be plugged in, in any orientation, thus causing the knocking sound that you hear. As for not charging, you have a newer iPod that uses USB charging and your Dock is an older model that supports FireWire charging. There are several types of adaptors online to order, try searching for "bose sounddock board upgrade", choose the first site at the top. If your comfortable fixing electronics yourself than this is the place to go, enjoy!