When I measure my Markaudio Alpair 10.2 TQWT speakers separately at the listening position I see no dip around 100Hz, but when I measure both speakers at the same time (orange) a wide dip occurs at 100Hz. It seems as if both waves at the listening position get out of phase at 100Hz. I have the same effect with Harbeth P3 speakers. Does anyone understand this effect and how it can be corrected?
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If you look carefully, the orange trace is almost never the highest below 1 kHz.
What happens to RL if you reverse the phase of one speaker?
What happens to RL if you reverse the phase of one speaker?
Can be a mode which is excited by both loudspeaker playing. I seen it happened when we treated an axial one to discover it puts into light an even worst oblique one...
0,85cm from floor?
0,85x4=3,43m
343/100hz= 3,43m.
You've got part of your answer imho. ( blue trace is left one in previous screenshot, that's it?).
Now you can say but it doesn't happen with one loudspeaker only, but given xhape of your room all bets are off, there is too many steps to predict anything simply. Try another location for the loudspeaker imo.
0,85x4=3,43m
343/100hz= 3,43m.
You've got part of your answer imho. ( blue trace is left one in previous screenshot, that's it?).
Now you can say but it doesn't happen with one loudspeaker only, but given xhape of your room all bets are off, there is too many steps to predict anything simply. Try another location for the loudspeaker imo.
Just making this up here... since it happens only with the two speakers, the two sources make an array and some off-axis effect reflects in your room back into the listening location to give the effect. To investigate, you could change the distance between the speakers, and / or their relationship to the walls of your room. Measuring response at different locations might be illuminating...
Moving the speakers closer to the wall doesn't help. Only when I move them 85cm from the wall I get a good result. Unfortunately, that is not practical in my living room.
Moving the listening position forward and back does not help much. It is also not possible to slide the speakers to the right or left. Another place for the speakers is also not possible, because they are part of a surround system when watching films. The TV is between the speakers.
Regardless of where the speakers are, the subs should be able to clean it up if you find the right location for them (or to a lesser degree, it). As rayma points out, height is needed for access to some modes.
The response tells a lot in this region. As you get a more consistent response you can begin to EQ. EQ is not something you want to do to fix nulls, but small dips are OK to EQ
It appears that you have got the phase correct, but your room is the cause, the strong reflection from the wall to the right is guilty