Digital Sound & Music: Concepts, Applications, & Science, Chapter 4, last updated 6/25/2013
the balance later. Using two microphones can help, but then you have to figure out how to get
one microphone to pick up only the first guitar and another microphone to pick up only the
second. This perfect isolation is really possible only if you record each sound separately, which
is a common practice. However, if both sounds must be recorded simultaneously, you'll need to
seek as much isolation as possible. This can be achieved by getting the microphones closer to the
thing you want to pick up the loudest. You can also put acoustic baffles between the
microphones. These baffles are simple moveable partitions that acoustically absorb sound. You
can also put each musician in an isolation booth and allow them to hear each other through
closed-backed headphones.
If you need to isolate the microphone from the reflections in the room without resorting
to an isolation booth, you can achieve modest success by enclosing the microphone with a small
acoustic baffle on the microphone stand like the one shown in Figure 4.39. This helps isolate the
microphone from sounds coming from behind or from the sides but provides no isolation from
sounds arriving at the front of the microphone. This kind of baffle has no impact on the ambient
noise level picked up by the microphone. It only serves to isolate the microphone from certain
reflections coming from the studio walls.
Figure 4.39 Acoustic baffle for a microphone stand
Room ventilation is a notorious contributor to room noise in a recording studio. Of course
ventilation is necessary, but if it's done poorly the system can compromise the acoustic isolation
of the room from the outside world and can introduce a significant amount of self-generated fan
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