Where else can i place a subwoofer?

unfortunately my entertainment center shares a wall w/ my neighbor's bedroom wall so i've had to turn down the volume on the subwoofer which doesn't give me the full surround sound effect. is there anywhere else i can place a subwoofer that would be adequate? left/right/behind? any recommendation or suggestion would be really appreciative. it's a brand new system & feel i like i'm just wasting it.

It won't matter where you place it in the room. The frequencies of sound reproduced by a sub will create a vibration issue no matter where it is placed.

I have personally found in my own observations that in most systems the LFE on a sub is turned up to high to begin with. I recommend you get your system calibrated by a pro. The sound field should be transparent, meaning that your sub is not noticeable when it is on. To do this properly you will need a SPL meter to get close and maybe a little reading by my recommendation. depending on the system you go you may have an auto calibration feature already. But you neglected to include model numbers of your system so we will need that first to walk you through it. You could always put it on your sofa where you are sitting, hopefully the vibrations won't go into the floor but you'll still feel it while sitting on the sofa. if you have a coffee table between the sofa and the tv you can put it underneath, wont sound as good as being in front with the volume up but it at least it will be further away from the shared wall, you might want to keep the volume down anyway tho, you dont want the sub to overpower the rest of the speakers seeing as it will be much closer to the sofa. You can place the sub on the rear as well. You will need a longer wire for this application.