I’m after some advice on how to think about t time aligning subwoofers to main speakers. Two papers that have informed my thinking are the http://www.acousticfrontiers.com/guide-to-bass-optimization/?utm_source=CTA and http://www.soundoctor.com/whitepapers/subs.htm. The latter puts forward a case that the main speakers need to be delayed to cater for the delay common to subwoofers and this is a model that I’ve used with some success. My question though is whether, from a theoretical viewpoint, the delay should account for just the delay inherent in subwoofers or also account for the different distances from the listening position. The latter model sees, in the case of a distant subwoofer, the main speakers delay account for the additional travel time to the listening position as well as the inherent sub phase / EQ delay which makes sense. That said, with a set-up that is just focused on delaying the main speakers to account for the inherent phase / EQ delay in subwoofers all the different bass sources would excite the room modes / pressurise the room at the same time which also seems like a reasonable objective. What, from a theoretical viewpoint, is the right answer?