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Discussion Starter #1 (Edited)
help with further construction of cinema / music room sloped front and rear wall

Hello,

I would love to hear some tips for improving my music/ cinema room
Room is about 3.55m X 6.35m x 2.3m high

I am concirned about the sloped front and rear wall and how to treath them well, should i make the front wall completely death?
I have the idea to instal an acoustic transparant projectioj screen about 1.2 m from the front wall and maybe put the front speakers behind the screen.

Right now everything is harsh sounding with no imaging, kind of compressed sounding, boomy aswell. All energy seems to stay in front of room.

I will do everything that is necessary to turn this in a well balanced sounding room. So all your tips are welcome and much appreciated!

by the way here are first pictures and measurement 1/24 octaaf smoothing:

red is front speakers only
green is with sub x-over 80Hz
 

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What EQ is being used?

1.2m baffle wall with acoustic dampening would definitely deaden the boomy sound.
 

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Discussion Starter #3
Would you place the absorption behind the speakers or on the sloped ceiling above the speakers, also what thicknes?
 

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Discussion Starter #5
thank you for your kind help, any advice is much appreciated as i am in the progres of learning.
 

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Front wall should be 100% dead with something like 2" 703 or ECOSE. Front corners you will want chunk style bass absorbers. A false wall will allow all of that to be done but not seen for a nice clean look.

Rear wall - I prefer to use 6-8" thick panels, potentially with diffusion pending how many rows and how close the seating is to the rear wall to allow the diffusion to develop properly.

The dip around 120Hz is likely a phase cancellation off of the side walls. Could also be the front wall in which case you'd want to thicken up the center of the front wall to address it.

Bryan
 

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Discussion Starter #7 (Edited)
Bryan,

thanks for helping me out.
this raises another question: will this treatment have an effect on the rear ports of the front speakers?
Also my subs are frontwall firing and have a passive radiator pointing in listening direction.

if room is 60% music and 40% movie, does the entire frontwall still have to be 100% dead?
 

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Front wall dead will not hurt 2 channel and will definitely help home theater. Should not impact the rear waves being only 2" thick.
 

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Discussion Starter #9 (Edited)
I can make front corner absorbers a large as 47" each side of his corners or 120 cm and 130cm or 52" high filled with 703 or glasswool.
Good idea or too much absorption?
 

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Don't know that you need 47" wide. Maybe 24" wide and 12" deep?
 

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Discussion Starter #11
Bryan thanks a lot for your feedback.
I will continue building in steps starting with the front wall and make mesearements between each steps and post here.

It would be great if you can give me further advice between each steps.
 

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Do you have a picture of his room or crude drawing at least?
 

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Ok sorry. You were talking about the room earlier then mentioned "his," so I thought maybe there was another room you were doing. Was just confused. Understand now.
 

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waterfalls looks pretty good. 30 will be tough to address. The ply across the front may be resonating.

Looks like the overall sub level is too high.

Pull the mic forward or back a foot and see what happens to the null around 120
 

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Discussion Starter #17
Tommorow i will try to adres the 120hz null and post here.
Maybe i can tame the 30 hz region by putting one of the subs behind the listening position and leave the other in place, will try tommorow.

What about 120 till 800hz range, i see many dips aswell?
 

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Discussion Starter #19 (Edited)
mic 4.2 foot to the front. this is middle of room!
120Hz problem is smoothed out, altough this position gives best sound this seating position is not doable for me bacause of too close to the screen.
Its strange that in my room sitting in the exact middle gives best overall pereformance, i think it has something to do with the sloped ceilings.
I could install a new backwall without sloped ceiling but that would decrease room size by aprox 3.2 foot, maybe the experts can tell me to do so or not?
There is also a doorway without door on the right side of the couch, i can remove that doorway?
 

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Discussion Starter #20 (Edited)
One sub behind couch in red.

Backwall is made of one layer drywall, you can see in the graph that its resonating on multiple frequencies when i place one sub behind the couch.
Maybe this wall is making cancellations with frontwall and therefor best performance is in middle of room?
 

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