My control room is 136.5" w x 219.5" l x 84" h.
Construction is 2x4 framing with 6" R-19 insulation between the studs, then 1 layer of 5/8" drywall. I ran boards across the insulation on the open side to keep it tight against the drywall.
Ceiling is 10" thick R-30 insulation between floor joists and will be covered with burlap. (soft ceiling).
Floor will be hardwood, under the hard wood is concrete.
I will be sitting at the 38% mark and the speakers will be soffit mounted to 60 degrees.
I put the dimensions into modecalc and this is what I got: (see attachment) Is this a desireable readout?
My questions:
How will a soft ceiling change this read out? Isn't this based on a hard ceiling?
Is it a sure thing that I will need bass traps in all 4 corners?
Do I put a bass traps behind the speaker soffits?
Thanks
Please help with room treatment
Originally posted at johnlsayers.com, topic 11134.
I'd say you're in reasonable shape. Definitely you'll want to add bass trapping/absorption to the 4 wall/wall corners, as well as some of the wall/ceiling corners if possible. Also the rear wall should be treated, either with more absorption or diffusion or both.
The readout (output of ModeCalc) won't be affected by having a soft or hard ceiling; it's merely a calculation (not a measurement) of some of the resonances in a room with your dimensions.
If you really want to know, then get something like Room EQ Wizard and measure your room, ideally before treatment and after, so you can really see the effects of your treatment.
That said, having a soft ceiling is usually good, in a home studio context (ie, unless you have very tall ceilings).
There are designs on this site for soffits with built-in bass trapping (several drawings in this thread).
Keep in mind that 38% is only starting point. You may find that you get a better frequency response a little forward or back. As JWL was saying your really going to need to test the room to figure out all the problem frequencies. One thing is for sure that you will need bass trapping in all for of those corners. :D Not sure if I would cover the whole ceiling right off the bat, but maybe start with covering in the early reflection area above the mix spot. Glennwill be sitting at the 38% mark and the speakers will be soffit mounted to 60 degrees.