EddNog
Major Contributor
I’ve always had the ports on the LS50 Metas plugged since I got subs.Looking at the combined response I could guess there is some combing cancellation, due to reflected wavelengths correspondingly to 4 times the distance from the back wall. Give the frequency I roughly calculated about 42cm.You could try to reduce the distance of speakers from the back, inserting in the meantime the supplied port plug to avoid bass response increase. A possible position could be over the subs. Obviously a new set of Dirac measurement will be needed but likely the combing effect should be reduced. I have the same speakers and for the same reason I put them about 10cm from the back wall and with theirs plug, the bare response it's flat and Dirac has less holes to correct.
Let we know...
I’ve actually adjusted the delay and crossover settings to 160Hz (the room’s actual Schroeder frequency) with 8.15ms delay and the crossover point is a lot better. Now, these sweeps don’t look as flat anymore because instead of calibrating for a single point like I did for the above sweeps, I’ve calibrated it with sweeps at 9 different points (the MLP plus eight spots surrounding the MLP):
Combined:
Left:
Right:
-Ed
