We all do what we can do given our self-imposed or spouse-imposed restrictions.
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Zheng4,
The suckout at 150-200Hz (wavelength of between 7.5 to 5.625 ft) is likely a product of the interaction of the speakers with either the front wall, or the floor. You should experiment with modifying either the speakers’ distance from the front wall, or the floor - even raising the listening chair’s height to change the floor bounce effect. The bass baffle of my speakers are placed 6.18’ away from the front wall (as a ratio of 0.618 to the ceiling height of 10.0’), as well as raised 7.5” off the ground with a combination of decoupling bearings and bass absorption platforms. This combination of wall/floor placement, including moving the woofer driver/ports away from the floor, has resulted in the reduction of a number of room nodes, and smooth bass response throughout the listening space.
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Brett 66,
So well said ! 
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Details on the decoupling bearings and bass isolation platforms:
The ceiling treatment in my listening room, with ~750kgs of diaphragmatic bass absorbers and quadratic diffusors.
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oh my. that would make me nervous to sit under given all the earthquakes we have here in california.
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Luckily, they’re in front of my listening position/sofa, so should the unthinkable happen in Hong Kong, I can simply duck backwards! 
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Insane WATChad, insane. What absorption materials did you use? (The rest of the room looks pretty good to.)
Thanks! The reverb was surprisingly fantastic before the treatments, and better still after.
It’s really OC 702/703 but it’s black and called SelectSound. Fragile stuff and fairly large. I covered the black with burlap and spray adhesive, and it’s hung from my attic. It was not easy to get right, but it’s right.
Sorry to revive an old thread, but there seems to be some difference of opinion for ceiling treatment location.
I have adhesive backed panels like this:
Should i place these on ceiling halfway between speaker and listening position to catch first reflections? Or, should they go over the speakers? Bonus question - my speakers are bipolar and are 5’ from back wall. Should i place another set bethind the speakers, 1/2 way between speakers and wall?
The rule of thumb I have adopted (but don’t have ceiling treatments myself) is that absorption panels should be placed at the first (and if practical, second) points of reflection on relevant surfaces (floor, ceiling and side walls).
Your bipole speakers may have more than one set of first and second points of reflection, but I would expect their impact to be less important due to their directionality. 
What are your current thoughts on the subject?
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hi @scotte1 i held the same opinion as you. I actually applied the panels about 1/2 way between the speaker location and my seating position.
I did not like the result! It took away too much of the ambience and “live” feeling of the sound. Almost to say it sounded too dampened.
Well, your ears need to be the final arbiter.
My opinion is that smearing of the image from first and second reflection points can really screw up the clarity of sounds in space, but too much dampening can take away the sparkle of well recorded music.
Maybe diffusion would work better on the ceiling in your room.
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For people with analogue systems they’ll never get enough absorption in the room because they can’t EQ. For those of us with digital systems it’s perfectly possible to keep adding absorption and then digitally EQ to make up for the fact that you’ve got rid of reflections and will better hear what’s actually coming out of the speakers. In my case I’ve experimented over many years with active systems and can assure you all that the more obsorption you add the more detail will be heard - however I probably have to put at least double the amount of power into the upper frequencies to counteract the fact that reflections have been absorbed. I’ve said things like this countless times. I would always recommend starting with as much bass trapping as is possible and then add the absorption of upper frequencies but it’ll be obvious that you’ll very soon need to EQ.
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I have 8 GIK 244’s on my ceiling. Multiple GIK panels on the back wall behind my speakers. The ceiling is unfinished but I have the joist packed with several layers of Rockwool Safe & Sound insulation. I’m happy with the results.
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It seems really nice.
Oddly, it sounded nicer a few weeks ago.
Goals!
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Yes oddly $20k in Stealth power cables enhanced the sound. I sadly I forgot my Powerball ticket last night so that upgrade will be delayed again.
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