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I am tryin to help a friend soundproof an apartment. So far I've thought of hanging a carpet on the wall, ya know like a nice classy one...

Any other ideas?

if you want it completely soundproof, it's virtually impossible with an apartment. extremely thin walls plus the fact that the only real way to do this is rip the walls down, replace with thicker sheets of plyboard. there is a special unsulation they make specially for the purpose of sound proofing places like music production companies. this is the only real way to go abouc complete sound proofing, and i highly doubt he can acheive this renting an apartment.

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Yep, unless you can tear down the walls and start with resilient channel on the studs before you put the rock up, rugs are your best bet. Any hanging cloth will absorb sound, the heavier the more so.

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they make stuff for musicians its a foam sheet with pyramids on it that dampens the sound, really expensive imo and it wont do it completly but it should help alot, they also make noise screens fro drummers which is just like a trifold poster board thing but much bigger and looks like plexiglass to me. youll prolly be able to find them on musicians friend

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My big question would be what sounds are you trying to block?

If you're trying to soundproof the apartment against noisy neighbors then you need a full soundproofing thing to really get it done. Same goes if you want them to never hear anything from within the apartment.

If, on the other hand, you're trying to prevent people outside the apartment from hearing specific things, that can be accomplished more easily. Say for example you're trying to mask the sound of fans or pumps. If you can isolate the vibrations those objects generate from easy transmission you can reduce or eliminate them from being heard.

Think about the upstairs apartment. You might not be able to hear them talk, but you can hear them walk around because the foot falls directly impact the structure of the floor. Same with their TV since it solidly contacts whatever it sits on, which is in direct contact with the floorboards. Solid objects transmit sound better than air. So look for ways of blocking or absorbing those vibrations. Suspend pumps with bungee cords, put foam or rubber mats under noisy equipment, and so on.