Impedence and various inputs

Can someone explain to me what impedence is? Also, I have a Presonus Firepod.  It has three kinds of inputs:  mic, line and instrument.  What is the difference between them and does it make a difference for sound quality if

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4 ohm speakers with an 8 ohm amp

will this configuration damage my speakers ???? I will get a 4 ohm amp as soon as possible, but in the meantime, i was wondering if i can get by with this temporarily Unless there is a specific warning on

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