Brookjoo,
You need to get a book on acoustics and soundproofing. It is pretty hard to isolate bass frequencies.
Most of what you can put on the walls and ceiling will attenuate higher frequencies, but lower frequencies are tough. I don't think bass traps will actually lower the amount of bass transmitted to another apartment appreciably, but, if they, and other acoustic treatment improves the sound, you would tend to want to listen at lower levels than before.
As i mentioned before, the use of another layer of drywall with "green glue" between the layers will provide some bass isolation. This should not take up that much more room (compared to a second wall). There is quite a bit of discussion of green glue if you google the term, such as the following:
http://www.housingzone.com/blog/1290000529/post/1980051998.html
A friend had a professionally designed (Rives) dedicated listening room installed in his home and a lot of that stuff was used in the construction.
I bet that the extrasheet rock on the ceiling (with green glue in between) and a really good pad under a thick carpet will do quite a bit to reduce noise transmission. This would absorb some of the energy and provide extra mass, which also inhibits transmission of sound. Doing the walls too, would help, even if the big problem is with transmission to higher and lower floors rather than next door, because bass energy transmitted into the structure travels everywhere.
An energy absorbing platform under the speaker or speaker stand should provide some isolation from direct transmission of vibration from the speaker itself to the floor. Even if it only provides a little help, it is better than nothing, and besides, it often improves the sound of the system.
You need to get a book on acoustics and soundproofing. It is pretty hard to isolate bass frequencies.
Most of what you can put on the walls and ceiling will attenuate higher frequencies, but lower frequencies are tough. I don't think bass traps will actually lower the amount of bass transmitted to another apartment appreciably, but, if they, and other acoustic treatment improves the sound, you would tend to want to listen at lower levels than before.
As i mentioned before, the use of another layer of drywall with "green glue" between the layers will provide some bass isolation. This should not take up that much more room (compared to a second wall). There is quite a bit of discussion of green glue if you google the term, such as the following:
http://www.housingzone.com/blog/1290000529/post/1980051998.html
A friend had a professionally designed (Rives) dedicated listening room installed in his home and a lot of that stuff was used in the construction.
I bet that the extrasheet rock on the ceiling (with green glue in between) and a really good pad under a thick carpet will do quite a bit to reduce noise transmission. This would absorb some of the energy and provide extra mass, which also inhibits transmission of sound. Doing the walls too, would help, even if the big problem is with transmission to higher and lower floors rather than next door, because bass energy transmitted into the structure travels everywhere.
An energy absorbing platform under the speaker or speaker stand should provide some isolation from direct transmission of vibration from the speaker itself to the floor. Even if it only provides a little help, it is better than nothing, and besides, it often improves the sound of the system.