Very interested to know what treatment would be recommended to go with the 3677.
Just to put some sort of balance on the performance of the jbl 3677's is that although they are not harsh especially on the end of some good amplification like some folk would have you believe! but they are somewhat limited in the hf areas and is the only real reason my friend decided to go with the Sk2 3300c and the Sam 1LF Sam 2hf for LR duties.
So if you look at the frequency specs of both the 3677's and them of the Sk2 3300's you will see quite a large differential in hf response?
You need to understand the room in order to answer that question. "Treatment" isn't something to be taken lightly nor is it the same for each room; but as a starter, I'd be looking at treating first and second reflection points as a minimum. If you don't know what those are you have some reading ahead of you (but fun reading).
Hi Phil will you be building a false front screen / lcr speaker wall and do you intend to panel over any of the other walls , a good place to start for acoustically treating the amount of bass that will be generated in your room is to fit four corner bass traps from floor to ceiling plus the front soffits and floor and the same at the rear if you can!
If you are going to panel each wall any way you can incorporate the acoustic material laying it flat behind an acoustic panel just in the corners where the acoustic material has been fit as its pretty expensive boarding.
The other way is just positioning these bass traps in each corner View attachment 715746
Plus this type of soffit trap
On the rear wallwhich you can also fit some diffusers if youve got something like 3/6' behind you.
No not when your as old as us! its like yesterday................I think i may have just bought those 850's lets see if there as bad as you first made out
Thats a good starting point, what do I cover this with?
You could use either knauf Rs60 50 mm or 100mm thickness or knauf Rs100 at the same thickness's again , depending on how much space there is you've got behind there
The Rs100 is more dense and will absorb more ! Are you planning to place your sub(s) in this wall to or Behind lin front of it?