(01-Feb-2018, 10:33)samsoum Wrote: I m still playing with multidiffusers placement, the plan was the ceiling though.
Some diy panels for first reflexions also here some pics
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Nice room and setup. A couple of thoughts on your acoustic treatment.
Those bass traps are designed for installation at 45 degrees across the corner. Placing them the way you have will reduce their efficiency. I can understand why you've done it because of the difficulty with the window and roman blind on the right hand side and placing the left hand trap symmetrically to the right but I would suggest placing the left hand trap diagonally across the corner as they are intended to be used. You should get a bit more bass trapping as a result. The difference to the right trap is probably going to be less than you expect because glass is pretty lossy at bass frequencies so you're already getting the equivalent of some bass trapping on the right side anyway. You could try placing the right trap diagonally as well but you may have trouble with the blind. I would definitely try adjusting the left hand trap anyway and if you think that there's too much of an imbalance with the right side as a result you can always shift it back to its current position.
Now to the diffusors behind the listening position. The rear wall can be a good position for diffusors but diffusion needs distance in which to develop and there can be problems if you sit too close to the diffusor. I think it was RPG, a firm specialising in QRD diffusors, who recommend a minimum distance of around 10 feet between a diffusor and the listener and you're way closer than that. I think you'd do better with absorption behind your sofa because of its proximity to the wall and use the diffusors at the first reflection points on the ceiling instead, or up above the TV screen on the front wall.
Finally, re treating the side wall first reflection points. I've seen recommendations for doing that and I used to do it in my room. I thought it was quite effective. Then I read Floyd Toole's book ("Sound Reproduction") and his comment that studies show that most people prefer the side wall first reflection points untreated because it gives a pleasing widening of the sound stage. I tried it, preferred the result, and I've left my side wall first reflection points untreated since then. Rather than placing your diy panels at the first reflection points, I'd try moving them either back towards the wall behind the speakers or forward along the side walls towards the listening position. Experiment a bit and see if you prefer having the first reflection points treated or having that absorption somewhere else along the side walls. You could also try raising the panels somewhat so the bottom of the panels are around 30cm/1 foot or so below your seated ear height.
As a quick experiment regarding the diffusers behind you, I'd suggest removing the DIY panels from the room and listening for a while to see yow you feel about leaving the side wall reflection points untreated and then, when you're adjusted to the sound of that, remove the diffusors from the room and replace them with the DIY panels to see how you feel about absorption behind you instead of diffusion. You could also try just swapping the diffusors to the current panel locations and the panels to the diffusor location to see how that works.
There's a lot of different views on room treatment but I've come to trust Toole's recommendations quite strongly over the years. Unfortunately they're based on symmetrical rectangular rooms which mine, an L-shaped room with 2 open archway entrances, most certainly is not, so I've had to experiment quite a bit and I'm back doing that again after changing my speakers a few months ago. While your room looks symmetrical, there's actually a significant difference between your left and right walls in relation to construction and that will be making a difference so I suspect that a bit of time playing with placements might surprise you. You will probably notice some significant changes in soundstage width and depth, and also how "lively" the sound is. There can also be changes in timbre. One thing is certain and that is that you will prefer some treatment arrangements to others. You may end up with things back just the way you have them now but I think that you may well find another arrangement more pleasing to you. The only thing it will cost you is a bit of time playing. I think that time is worth it because it can teach you a lot about your room and how it works and that kind of information is always useful.
Roon Nucleus+, Devilalet Expert 140 Pro CI, Focal Sopra 2, PS Audio P12, Keces P8 LPS, Uptone Audio EtherREGEN with optical fibre link to my router, Shunyata Alpha NR and Sigma NR power cables, Shunyata Sigma ethernet cables, Shunyata Alpha V2 speaker cables, Grand Prix Audio Monaco rack, RealTRAPS acoustic treatment.
Brisbane, Qld, Australia
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