Soundproofing a home "studio"

[B2Bomber]

Hi all, I've got a colleague here who's bugging me how to do this and how to do that while I'm surfing my fave boards. So I figured, I might as well ask you guys for some solutions.
Here's the scenario:
He turned one of their house's rooms into a practice area for his kids who are all in the same band. So, you've got your typical drums, keyboards, guitars, etc. in their. His initial problem was that (ofcourse) neighbours complaining about his kids' "racket".
I know this doesn't have enough details, so please feel free to ask if you'd need more info to help him further make his kids' practice room less noisier to the ears of his neighbours. Oh, and if it's any help, he really doesn't mind whether they sound good inside, as long as they don't disturb the neighbours.
He prefers to stay within Lumen's mantra: "singgaling pero di singmahal" and DIY if possible.
TIA.

[manggyver]

Here's what i learned from associates who also had similar problems:
- Area is critical, the smaller the area, options are limited (especially if you are talking of a band)
- If possible, locate studio at the basement or in the lowest floor of the house
- To start, enclose the area, minimize flow of air (coming-in and out). Consider installing airconditioning-unit.
- Dampen high-frequencies, carpet in the room will help this, even some carpeting on the walls. Heavy curtains or drapery etc...
- Bass is the BIG problem. There is a need to ISOLATE the room surfaces with dense and heavy material.
- Consider building a room within a room. Walls ceiling and floor need to be isolated from the original. Isolation prevents the transfer of bass vibrations thru to the rest of the house.
-Lay a new floor structure (2x4's and 3/4 inch plywood) on a series of rubber shims or blocks.
-The same principle is used for the walls, build the new wall structure (2x4's and 3/4 thick plywood or 3/4 thick drywall) and support it on some kind of shock absorbing material. Don't fasten the new wall structure directly to the old, again use shock absorbing material between and do not fasten too tightly , the tighter it is connected, the more bass will transfer to the outer structure.
- Isolation of a drop ceiling by hanging wires on springs and allow the edges of the grid system to "float" against the wall to prevent vibration transfer, use available inserts like foam or rubber mats

[B2Bomber]

ok thanks will pass this on to my colleague.