Especially not if you do MS Miking (MS, or Middle-Sides, is a Stereo miking technique that utilises one Fig 8 pattern mic and one cardioid. The signal from the fig 8 mic is split in two (using a splitter cable) with one signal having it's polarity reversed (this can be done by using the Polarity Reverse control on your pre-amp or desk). You then use panning to widen or narrow the stereo picture, with the cardioid filling in the middle. Since the two signals from the Fig 8 mic are "Out of phase" they will disappear when summed to mono, leaving only the signal from the cardioid mic.)