Here are some helpful tips and links:
Subwoofer Calibration
Multiple subs I realize you are talking about one, but you may learn some things about placement from this article.
The third step is to measure the highest peak in the bass (room mode). Assuming you do not have an eq, then play that tone continuously and walk around the room with an SPL meter. Find a null for that frequency and place the sub there (assuming it's a reasonable location). That will give you the flatest response, and with that sub, it's unlikely you need the gain provided by placing it in the corner.
If you need a test CD, we make one calibrated for the RS SPL meter. You can find it here: Test CD 2
Subwoofer Calibration
Multiple subs I realize you are talking about one, but you may learn some things about placement from this article.
The third step is to measure the highest peak in the bass (room mode). Assuming you do not have an eq, then play that tone continuously and walk around the room with an SPL meter. Find a null for that frequency and place the sub there (assuming it's a reasonable location). That will give you the flatest response, and with that sub, it's unlikely you need the gain provided by placing it in the corner.
If you need a test CD, we make one calibrated for the RS SPL meter. You can find it here: Test CD 2