Where in your home you choose to record your auditions (and work, when you get booked and you use your home studio and equipment) can have very different acoustics depending upon how that space’s walls, floors and ceilings are treated.
But none of those treatments will soundproof the room.
Why all that foam on the walls?
Countless times, a student or client has come to me, proud of the fact that he or she has finally outfitted that second bedroom with acoustic foam, egg crates, carpet or some other treatment.
And sooner or later, they come back to me, trying to figure out why they still hear street noise, airplanes and helicopters overhead, or their neighbors having loud sex, all of which ruins their auditions and production.
Because wall, floor and/or ceiling treatments don’t keep sound out. They just minimize the repetitive, wacky bouncing of sound around the room.
Exercise: Go in any bathroom, with its hard surfaces, tile, mirrors and tubs and showers, and say, loudly, “Ah HAH!” and listen to how long it takes for the sound to decay back to silence.
Then, mosey over to your walk-in closet, with its hanging clothes, irregular surfaces, shoes, ties and so on, and do the same thing. Your shout dissipates pretty quickly compared to the bathroom.
Yet, in both rooms, you can hear planes and air conditioning and those neighbors from outside the room.
(Not that I’ve been in your closet or bathroom.)
When you speak, those repeating “standing waves” of sound are heard by your mic, then absorbed in your recording space by putting treatments on the interior surfaces of rooms, but that treatment does not keep exterior sounds out of that treated space.
That requires isolation from exterior sounds – a barrier of air or water surrounding the room is best. That’s why radio stations and recording studios are built as rooms-within-rooms, and why WhisperRoom and Studiobricks installs work – it uses the air that surrounds it in the room in which you place it as that barrier.
Hope this helps.