Basement sound proofing too much/not enough???

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wolf_recordings

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I'm back again, but this time without pictures. :-) After some great feedback and guidance on my studio layout plans (thanks everyone!), I'm starting to consider materials, wall thickness, ceiling sound proofing, etc. I've read the SAE Institute pages a couple times, as well as other sites mentioned on here, but none seem to address the following (or maybe I'm just blind):

(As for my location, I live in the 'burbs and have neighbors on either side of me about 15-20 feet away, with open-space behind me and a long stretch between me and the neighbors across the street. I know it's not ideal, but I hate long commutes to work, plus more time at home equals more recording time.)

Having said that, how serious do I really need to soundproof the walls of a fully submerged basement? First and foremost, I don't want the police called on me at 3:00 am for disturbing the peace. Ideally I'd rather my neighbors not even know there is a studio down there. Will a "standard", well caulked, framed 2x4 wall, along with the existing concrete wall and 15-20 foot of dirt between my basement and the neighbors house be sufficient to at least avoid a visit from the cops? Or should I go more extreme and build a 2x6 wall, or finally go with my original plans of building a double wall with an air gap, consuming about 1 foot on all sides. Obviously the more space I can save, the better....

Next, should I assume my ceiling and staircase to the upstairs are my worst enemies and invest most of my time and money on them, making them as sound blocking/absorbant as possible? I already know the three windows in the basement are a weak link and plan on creating inserts to go in the windows as well as the window sills outside.

Any basement dwellers out there?


Thanks,

Alan
 
A lot depends on the ambient sound outside your home. If there is a constant hum of traffic then you can get away with a lot more bleed. If it is dead quiet like out in the woods then you have to be much more carefull.

I've got a freeway about a mile away and I don't really have to do any soundproofing in an above ground studio. I've got a 100' of space between any windows and my nearest neighbors. There are neighbors about 15' on one side but there are no windows in the studio facing that direction.
 
The house is in a quiet neighborhood (At least I hope so! I haven't moved in yet, but I'll find out soon enough since I take possession in a couple weeks. Every time I've been there it's been extremely quiet).

I suppose I shouldn't make any decisions until I've lived there for a bit and have determined what ambient noises I need to keep out also. It seems to me that the ceiling is going to be the crucial soundproofing component. But if my walls are too thin, will the sound escape near the top of my walls (bypassing the ceiling), climb through a small amount of dirt, and escape into the open air. So I'm still back to my first question: To soundproof so almost no sound escapes the basement, do I need stout walls with an open air space, or will average walls be sufficient, since I'm already underground?

Alan
 
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