Soundproofing One Wall, Soundproofing Options

[sethjacquay]

I am going to be moving into a new apartment next month and
my new landlords warned me about a dude in the building next door
who might complain about sound.

I am interested in soundproofing the wall that the neighbor and I share
probably about 10' by 8' in size.

Obviously, headphones would work, but when I am singing and playing
acoustic guitar I will feel better about letting loose with some sort
of sound barrier on that wall.

Any suggestions?
Does anyone else have some sort of setup they use?

I was thinking about those foam absorbers, but I read that they actually
don't block the sound and might actually cause him to hear more noise.

I am considering a vinyl barrier that would hang from the wall. It won't block everything
but should add another layer to help reduce the sound transmission directly through the wall.

[tarkus]

The hanging of a large sheet (as large as posible) as heavy(dense) as possible sounds like your best bet to me. It should be isolated from the ceiling by some means of suspension (springs and or rubber). The bass trap effect should also improve your room's sound. Mass and layers are the key. Also adding layers to the flooring might help. Your first concern though should be any outlet that might exist on the common wall - a hole wiil act like an open window tranmitting your sounds.