the bottom curve is with the phase switch in the 180 position. I tried to move the sub as close to myself as possible but it doesn't seem possible to get it as close as the nearfields, so I think I'll just use it for fun, and make critical bass mixing decisions using headphones, or with the sub switched off. I ended up not using a crossover at all. Subjectively, the information below 80Hz seems so much tighter and more accurate coming from the K&H's than from the sloppy Tannoy sub, so I just set the high pass for the sub to about 50Hz, to use the low-end response of the K&H's as a natural kind of crossover. Despite the fact the room sounds a great deal tighter and less boomy now than it did at the outset, even with the sub, I'm kind of disappointed with how little the frequency response has changed-- and more and more confused by the results of tiny tweaks... One more piece of advice I'm going to have to follow: Quote young david: Final tip would be once you've settled on the layout, print your room eq graph and stick it on the wall. I'm pretty happy with how the room sounds. I don't think the frequency response tells the whole story, as the room subjectively is quite non-resonant without being oppressively anechoic, and I seem to be making good mixes. Here's hoping we don't get kicked out at the end of our lease!