Q: I recorded a band in a largish hall, where I close-miked the vocals and instruments or took them direct (bass, keys). I also used stereo mics, back in the hall, for ambience. I’m high-pass filtering the mics as you have suggested in previous Tech Tips, but I’m still getting a muddy sound, any suggestions?
A: Are you high-pass filtering the room mics? If not, we would bet that the bass and kick booming in the room is getting picked up by that pair of microphones and creating a muddy wash. Since you’re looking for ambience from those mics, you may be able to filter them quite high in frequency — perhaps as high as 100 to 120Hz.