| Samsound is correct but not quite for the right reasons. A mic will have no real problem going into a high-z input, as long as the impedance of the input is greater than the impedance associated with the signal going into it then there will be no nasty artifacts. At very worst you will get a gentle softening of the highs, which can be really quite flattering (especially on bass).
Its going the other way that sounds less musical! High impedance signal into low impedance input can get a harsh and brittle edge to the sound that can't be eq'd out, not nice. Sometimes it works though, all about context. You REALLY notice this pluggin piezo pickups direct into the line-in of a mixer, thats a bout as big a mismatch as you can get and can sound pretty horrific sometimes!
However, a line or instrument input will not have the necessary gain to amp up a mic. Mic level is the smallest signal level commonly used in recording, its tiny, and the jump from mic>line level is the biggest jump you see at any point in the signal chain! Thats why people go on about mic pres so much, they are a vital tool when using mics!
You'd have to crank a Line/Instrument input high to get a decent signal out of it, and when amps are working in their top range they can bring in a lot of extra noise, and added to that those types of inputs don't carry phantom power, so a whole host of mic-types will be unusable!
+1 above re di, its an option for later but for now you're fine with the DI inputs on your mbox.
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