i'm converting my garage into a studio and i was going to add 2x4's on every wall, insulate the walls then put carpet padding over it then carpet. would that be okay for sound profing the walls? im making panels in this studio just fyi.
No. While that would do something to control the high frequencies bouncing around the room, and
may translate to better acoustics for you and your mics...it would likely do
little for room acoustics and absolutely
nothing for noise reduction and transmission.
For true "sound-proofing" the only answer is MASS and ISOLATION.
Walls must be thick and heavy...as thick and heavy as your time, space, and resources will allow. Your room must be separated...physically separated from space you do not want "contaminated" with sound.
The best way to achieve this, is through a "room-within-a room" concept.
You must construct a totally isolated and free-standing "box" within an existing room...the walls of which are constructed of the densest material available.
This does a couple of things... the density of the new walls, will alone reduce the transmission of low frequencies and practically eliminate the transmission of high frequencies. This is good...but not enough.
Now...to further reduce the transmission of low frequencies... the boom-boom-boom we associate with powerful car stereos heard from 300 yards away... you need to have an air-gap between one wall and the next...with little to nothing physically connecting the two walls. This "void" of as little as 2 inches...is usually enough to "disconnect" the waves traveling from one wall to the next, effectively "sound-proofing" the room...within reason.
Dense walls alone are not enough, nor is simply an extra wall within a wall, but together, they usually get the job done.