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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.
tboooe
theaudiotweak
1,793 posts
 
Sir

You have not taken the floor or the ceiling position out of the equation when you moved the speakers. You moved the speakers relative to the walls not to what is above or below. All speakers have a speaker floor bounce cancellation relative to the distance of the bass driver. You can have much the same cancellation from that same driver to the ceiling though at a different distance and frequency. If your monitors can be placed on the floor or on  shorter or taller stands or supports for testing this will give you more insight into a placement to reinforce the frequencys you are in search of. Tom
williewonka
1,826 posts
 
tboooe - have you tried putting the speakers against the 3ft wall?

If yes - did you still get dips in freq response?

What is on the floor? if it's hardwood - try a rug in front of the listening position.

Regards...
theaudiotweak
1,793 posts
 
The rug will act as a comb filter and could add some benefit, a natural wool rug will be best..but will not help at 80hz. Tom
miko71's avatar
miko71
60 posts
 
Deqx? that ought to clear up all your troubles.
gcdrum
19 posts
 
I bought 2 SVS subs and solved my room problem which sucked out the deep bass at the listening position. Lots of info on the web about this topic. 

My my speaker positioning and listening position have created stunning imaging and soundstage.  The compromise was the deep bass and it drove me crazy.  The bass was perfect before I rearranged the room setup (in an irregular shaped room) and it was good to find this solution.  The subs are barely making any sound, but it fills out the missing frequencies at the listening position perfectly!
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