[Anis]

Thank you for you quick answering !

If you make the broad band bass trap really thick and place it in the corners it will effect 42hz, but for frequencies that low I would go with tuned

I will then place as much absorbers in corners as I can and then tune some if it's not enough. Maybe i'll help with some equalizing as well...

I hesitate to think that your decay times should be a primary concern especially considering home theater use. (You did mean HT, right?)

What should I look for then ? (Yes, Home Theater )

Even with the FSK, it is still very lossy in a broad spectrum.

Yes, you're perfectly right. I'm afraid of muting the room in high frequencies ! I chose the FRK to reduce absorption in high frequencies compared with plain 705 for example. What do you advise me then to avoid this ?

T60 may not be as appropriate in a such a small room as perhaps T30/T20 as you can measure with REW http://www.gearslutz.com/board/studi...er-v2-1-a.html

I'll posts results asap !

For instance, placing absorption in front of diffusion seems counter productive.

Shoud I put only absorbers on side walls ? or something else ?