Flutter Echo problem.

Hello all! My first post, although I tend to lurk, and I know I've seen a lot of you on other forums. Well here's my sad story. I've been helping some friends convert an industrial unit into a rehearsal room / demo studio. It's going pretty well. The Live Room is a good sized space. I will post measurements tomorrow AM. It's roughly 10 x 11 metres and double height, so in the region of 8 metres tall. It has an angled ceiling of acoustic tiles, with 250 mm of rock wool behind it. The floor is laminate. Three of the walls are plaster board stud walls, and the fourth is breeze block. Of course all the walls are paralell. Two of the plasterboard walls also have windows in them which are paralell. And so that's the problem. Flutter echo. It's not horrendous, but it needs to be sorted. I am leaning towards some sort of diffusion (we already have some 703 panels of absorbtion around the corner in which the drums are set up and on the breezeblock wall) to keep the room lively. My question is...... would I need to entirely cover one wall in diffusors for it to be effective. I assume that this is the case. suggestions please you wonderful human beings..... Pete

My question is...... would I need to entirely cover one wall in diffusors for it to be effective. I assume that this is the case.

No. Alternating the ptches will reduce it. Also if you angle the walls or use pyramids etc, you can keep the livelyness of the room. Andre

alternating the "ptches" ... I realise that I need to use different angled panels etc. I just need to know if I need to cover the whole of one wall so that there are NO paralell surfaces, or if I can get away with some panels... i hope that makes more sense... I'm rather new to this! Pete

"ptches" is my misspelling of "patches". I am little confused. Can you post a drawing of the room? Also, where are you? Andre

I'm in London, UK (not London Ontario sadly for us!). I will post some drawings tomorrow. It's basically a rectangular room which is two storey's high. The roof is angled, but all vertical walls are paralell. Pete

ok... Some more info! The room dimensions are as follows: Length 6.62m Width 5.30 m Height 3.83 m low edge to 4.50m High Edge. The Low edge of the ceiling runs the length of the room so the ceiling is angled from left to right across the width. hope that makes sense. cheers Pete

what you want is at least 1:10 splay (about 6 degrees) between opposite surfaces, or absorption on the flutter path. I suggest either angled surfaces to retain life, or aborption panels on opposite surfaces. Andre

ok, thanks that's great. I have made a start. We built a large polycylindrical for one of the paralell walls and it has certainly helped with the worst of the flutter. There is still some, so I am going to look into large, smart looking absorption. what do you think? Pete