I'm seeing an unexpected difference between on-axis measurements of my speakers (Klipsch RP-280F) and measurements from the MLP. I took the on-axis measurements at a distance of 1m. The MLP is 2.5m (8.5 feet) from each speaker and 25 degrees off-axis. The speakers are in a family room area that is open on the right side, and there is a stairwell on the left side.
The on-axis measurements show that the speaker is pretty flat above 350 Hz (more so in the left than in the right), except for a wide dip from 550 Hz to 2 kHz (more pronounced in the left than in the right).
The MLP measurements have a big peak around 650 Hz, a smaller peak around 1250 Hz, and then settles down just under 2 kHz. I'm wondering what might be causing these peaks.
I noticed that 640*2=1280 and 640*3=1920, which suggests that the peaks might be the harmonics of a 640 Hz fundamental, but I have no idea why I would be getting such a strong fundamental here. My understanding is that room modes are weak/non-existent at this high of a frequency, so I'm not sure this could be caused by a mode (and why at the MLP but not on-axis).
What are the likely/possible causes of this, and what is the best way to treat it? Should I rely on EQ or is there a good way to find out where to place treatments to absorb some of the energy?
The on-axis measurements show that the speaker is pretty flat above 350 Hz (more so in the left than in the right), except for a wide dip from 550 Hz to 2 kHz (more pronounced in the left than in the right).
The MLP measurements have a big peak around 650 Hz, a smaller peak around 1250 Hz, and then settles down just under 2 kHz. I'm wondering what might be causing these peaks.
I noticed that 640*2=1280 and 640*3=1920, which suggests that the peaks might be the harmonics of a 640 Hz fundamental, but I have no idea why I would be getting such a strong fundamental here. My understanding is that room modes are weak/non-existent at this high of a frequency, so I'm not sure this could be caused by a mode (and why at the MLP but not on-axis).
What are the likely/possible causes of this, and what is the best way to treat it? Should I rely on EQ or is there a good way to find out where to place treatments to absorb some of the energy?