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Need help with room and speaker setup, big dip from 250-80hz

I have a very small and odd room.  The room itself is 9' wide by 10' long with 9' ceilings.  The wall directly behind my head is only 3' tall, above that it opens up to my family room and kitchen.  I have the speakers firing down the 10' length.  The speakers (Sonus Faber Guaneri Evolution monitors) are toed in directly at my head, 3' from the front wall, and 1.5" from the sidewalls.  I have bass traps in the corners, absorption at the 1st reflection points and ceiling, and a mix of absorption and diffusion on the front wall.  My listening chair is right up against the short back wall.

I just did a quick measurement of my room using a cheap RS SPL meter and some test tones.  It seems I am -6db at 630hz and 250-80hz.  Any advice what I can do to help alleviate these dips?  As you can tell by my room dimensions I do not have a lot of flexibility.  Thank you.
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tboooe OP
1,009 posts
 
I should also note that my biggest dips are at 80 and 160hz.  Not sure if that helps or not. 
tboooe's avatar
tboooe OP
1,009 posts
 
First of all, thank you all for the input. I spent a few hours moving my speakers around my music room, trying to move the speakers closer to the front wall, closer together, adjusting the toe, etc. I was able to get varying degrees of success but I still had massive nulls throughout the frequency range 80-250hz. I finally tried moving the speakers further out into the room. My reasoning was that I had good bass response below 80hz so I could lose a bit but hopefully still be within 3db of flat. I also moved my speakers further apart so that I was listening in an equilateral configuration. The results were better than expected. From 20-1000hz, I was within 3db of 70db. My only small null was at 800hz where the response was -6db down.
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