This thread is a spin-off from another thread which I did not want getting lost from this off-shoot. I know ShadyJ and I can have an active exchange which can obscure what may be a more important more slowly developing discussion so want to keep them separate (though they are closely related). Well, someone could download download REW, buy a mic and either borrow (or purchase with return policy) a sub that has been thoroughly measured by Josh (or your recent measurements). Once he determines the location of the sub and his LP, he could then take measurements and compare his in-room response to the results to determine room gain. That would take time and effort, but has the potential to save money. Maybe I'm wrong, but I think it is an idea worth floating. It also seems like mathematical modeling might be effective for any room which is a simple box (IOW, no vaulted ceilings open to second floor or open to foyer, etc. I realize that is ultimately the best answer, but I am not looking at a specific case and don't want to go down a road of detailed speculation which will ultimately lose traction as a worthwhile generalized discussion. For now, let's keep it in the spirit of your earlier post: Lastly, what are your thoughts on Audyssey as a tool to tune subs? Many believe that is where Audyssey is most beneficial. Have you looked at it much, or enough to understand its benefits and its limits?