Originally Posted by dr_hsu
Are those curves for just the sub or does it include the main speakers?
If the curve starts at 20 Hz, the response shown goes up to 1 kHz or so! The front position appears to be much better for the deep bass. The back position is better for the mid bass. Since it's harder to have deep bass headroom, I would use the front position. Note: I assumed that the dark horizontal line is the same SPL in both curves, and the same drive signal was used to produce both graphs.
Dr. Hsu, please keep in mind that the Audysssey Pro "after" graph (on the right) is a derived
graph, not actual measured in-room response. I have attached my Pro sub graph (three ULS-15's), and you can see that the after graph shows flat to 500 Hz. Even the before graph, which is measured, shows response up to 400 Hz. BTW, the dark horizontal line represents 75 dB.
The Audyssey Pro graphs have received considerable discussion on the AVS Forum Audyssey Pro Kit thread. Most participants agree that independent measurements more accurately describe what is actually happening with bass in the listening room.
I believe you are correct--the front placement does look like the better choice.