Originally Posted by Audiophile2k
If your goal is the smoothest possible frequency response, you should be level matching at the listening position. If you gain match, one subs response curve is more than likely dominant, while the other sub is just adding some gain. This is especially true if the subs are not equidistant from the MLP, or if one sub is corner loaded or getting some other room gain that the other isn't. If both subs are equidistant and getting the same room gain, both methods would yield the same result...in that case it wouldn't matter which method you use.
In the case of our subs, they're asymmetrically placed. Both are equidistant but one pair is stacked and the other is solo, both spaced the same distance from the corner boundary. But yes, as you commented, the single sub is dominant to the stacked pair.
So I use the dominant sub to steer the final adjustment of the graph, after gain matching and running both Anti-Mode and Audyssey via use of the subwoofer's gain setting. All actions guided by repeated use of the REW graphing function so I can see how any changes directly impact the room's response.
Oddly, our room's response is opposite to your above. The stacked pair lay down the dominant graph and the single sub adds gain to the left side of the graph. The center channel adds gain to the right side of the graph. Due to this push/pull relationship between the single subwoofer and the center channel, I can use the gain of the single subwoofer to control the left side of the graph and the AVR's center channel level's slider to control the right side of the graph.
(in the spirit of cooperation, the next time I set up and play with the subwoofers, I'm happy to level match the subs and see how the final product pans out)
-Edited by BeeMan458 - 10/24/13 at 9:18am