I need to do some voice-over work on my 2011 iMac so I rented a microphone, XLR cable and adapter from my schools media pool. The people there assured me it could do the job so I trusted them. When I get it home and plug it into my iMacs Audio In port, however, I find that the recording has barely any volume even when the input slider is set to max (any lower and it picks up nothing) Is there something Im doing wrong here? Ive read online that you need a powered mic, not sure if this is one or not, but I imagine it is since I can pick up SOME audio. Then again I cant seem to find even any batteries with the mic (or anywhere to put them) so who knows. Any thoughts?