Need Advice On Placing Absorption Panel On Ceiling

I put some 4'x4'x2" sonex on my ceiling.They are 12',I couldnt hear a difference so I dont know what to say about your room.Not many people put acoustic foam on ceilings though many do their walls.For the obvious reason.I would stay away from that project.If you must,be sure to get lots of 3M 77&78 adhesive spray and use panels no bigger than 2'x4'x2".Stay away from the 4 footers,there hard to handle,good luck,Bob

Thanks for the response Bob. Your experience of being not able to perceive any sonic differences has pretty much reduced my level of enthusiasm in going ahead with the project that could possibly ruin the ceiling after that (in an event I don't hear a difference and need to dismantle those panels). Will see if I can find something to prop those panels temporarily, just to be sure if they are able to bring some benefits before I permanently fix them to the ceiling.

Cheers.

see my system photos...ever evolving category, welcome to the pond
Larry

i have 4 echobuster panels on the ceiling. they (each) are about the size of a door- i.e. 3.5 ft by 6.5 ft. and spaced apart by about a foot. they are held by 4 anchor bolts and 4-L brackets. the brackets were screwed into the ceiling 1st. then the panels were held up by TWO PEOPLE ON TWO LADDERS, and then screwed through the descending piece of the L-bracket into the edges of the panels once
they were measured to be parallel to one another. the panels don't weigh much at all. but you have to clear the space underneath- a pain in the "neck". falling popcorn will get all over the stereo unless it is completely covered. in my case the ceiling is really high, so
the TWO INSTALLERS must be comfortable working on two 8 foot ladders, and have to take PRECISE MEASUREMENTS.
as for the sonic results, they were well worth the effort- slap echo was significantly reduced. plus i acheived the "concert hall acoustic ceiling" appearance that i was hoping for. as i recall, the four custom-made panels cost about $1200 shipped, and they included the hardware too. my "theory" that adding sound-absorbing surfaces to the room REGARDLESS of the precise location would STILL be helpful, and luckily it worked. my walls already had framed-art that i really loved, so i was determined to leave them in place. anyhow, the room looks nice and sounds nice. YMMV of course.

Thanks for all responses. I will most likely give it a go.

French_fries, may I know if your Echobuster panels are purely absorption, or a mix of absorption and diffusion?

Thanks in advance.