Yep, the reflection bouncing off the walls interferes with the direct sound arriving at
the mic. This can present as a hollow or boxy sound, or just some nastiness at a certain
frequency. It's similar with drums. The room is very important part of a lot of recorded
sound. but you need to position the source and the mic in such a way that the room
reinforces the fundamental rather than cancelling it. Very small spaces tend to be
problematic, while large spaces can suffer from the problem that early reflections are so
delayed that they don't provide reinforcement. How much this matters depends...With a drum
kit, which relies a lot of early reflections for density and a sense of '3D' it can be a
big problem. With a distorted guitar amp, you'll most likely find that a lack of early
reflection is even an advantage.
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