Post by Samo Kališnik on Feb 17, 2016 17:20:43 GMT
First I appologize for my bad english. I have a question regarding acoustic treatment of my room, which I now use for band rehearsal and listening to the music. Now I would like to use it as a listening room of my home recording studio, and, of course, still for rehearsing with my band. And I will also record instruments and vocals in this room. So I should properly treat it with acoustic elements. But because of the existing situation of the room I can not decide, where to put my two speakers to make the optimal acoustic in this room. I enclose drawings of my room in google sketchup. Thank you for the tips.
Post by Samo Kališnik on Feb 17, 2016 17:42:12 GMT
I also draw one possible sollution. On the drawing there is no thin absorbers yet, just provisory bass traps and position of the speakers and the new "walls". I chose this speaker placement, because in this placement they play in the longer dimension of the room. But they could also be placed at the opposite side of the room. What would be the best solution regarding windows? If they will be placed as I draw them, I'll have to make portable first reflection absorbers, because of the doors on the left and right.
I plan to make a drywall (is this a term for gypsum boards?) on the right side of the listening position, to make another room - vocal booth. Is it big enough, that it is worth being done?
The other question is the simetry in front of the drawn listening point. Will there be enough symetry for good stereo image?
And another question at the rear wall of the drawn listening point. I read in your book, Ethan, that drywall in the corner doesn't work as a bass trap at all. Is this because reflectivity of the gypsum boards? Should I find another solution or should I do like it is drawn, but with other building material?
Maybe you can suggest a good solution without having those drywall adjustments (I would prefer this solution!)?
Post by Samo Kališnik on Feb 17, 2016 23:30:07 GMT
I would also place bass traps on the wall-ceiling corners (I haven't draw it), but not on the floor. Another question: what should I do with front upper corner, where there is drywall hiding some pipes. How should I place bass trap there?
Post by Samo Kališnik on Feb 18, 2016 11:50:13 GMT
After further reading of your book, Ethan, I can probably answer a few of the questions to myself. So, regarding windows and chosen listening point. It is good to have windows in front wall, because there is no great need to absorb higher frequencies, because loudspeakers are playing in the other way, so the windows can stay free of absorbtion panels and daylight can enter in the room. At lower frequencies, where loudspeakers play omnidirekcional, the windows actually play the role of low frequency absorbers in a way. So the placement is probably good, don't you think? Also, If i put my speakers on the opposite side of the room, I would not be able to treat a back wall (because of a windows), which is the most critical wall beside the areas of early reflections at the side walls.
It is good to have windows in front wall, because there is no great need to absorb higher frequencies, because loudspeakers are playing in the other way, so the windows can stay free of absorbtion panels and daylight can enter in the room. At lower frequencies, where loudspeakers play omnidirekcional, the windows actually play the role of low frequency absorbers in a way. So the placement is probably good, don't you think? Also, If i put my speakers on the opposite side of the room, I would not be able to treat a back wall (because of a windows), which is the most critical wall beside the areas of early reflections at the side walls.
Yes, this is exactly correct. So your drawing showing the speakers in front of the windows facing down toward the rear is the best choice.
Post by Samo Kališnik on Feb 18, 2016 19:34:03 GMT
Thank you for reply. But what about the rear wall? Is the solution with the drywall OK, or not? Is maybe better, if I leave this side of the room as it is and make portable bass trap, with which I close the passage, when I will be mixing/listening music/practicing? I enclosed another drawing with this option on the rear wall. I assume, that this would be even better bass trap then the others which are directly in the corners, because of larger gap between absorbent material and reflective surfaces back there. Am I right? But if I make it that way, is that a problem with the asimetry at the rear wall? And just one more question, regarding the new wall on the right side of the listening point. What material would suit best if we take into consideration the absorbtion/reflection of the left side wall (which is brick wall), and good acoustic isolation of vocal booth?
A rear wall always needs treatment - bass trapping plus either absorption or diffusion. Your basic plan looks fine, and symmetry matters mostly in the front of the room and not much in the rear, especially if the rear absorbs fully. However you can attach absorption on the side walls is fine, and it doesn't matter what's behind the absorbers as long as the absorbers are symmetrical in size and placement.
How about the vocal booth? It could be maximum 2,6m high, 2,6m long and 1,5m wide if the opposite walls would be parallel. Will it be better to angle three of those walls, to reduce the impact of modal frequencies and flatten low frequency response? If so, I would angle the ceiling and the outer walls, with drywall. How much should I angle those walls? Or should I keep the walls parallel and maintain as much space as possible, and just put in there as many bass traps as I manage? Thank you, greetings, Samo Kališnik
Angles won't help, and it's best if you avoid the same dimension for length and height. A small booth like this needs to covered 100 percent with absorption at least 2 to 4 inches thick. According to my Graphical Mode Calculator program, reducing the length from 2,6 to 2,0 with the same 2.6 height and 1.5 width will be pretty good.
Post by Samo Kališnik on Mar 12, 2016 11:55:51 GMT
OK, so I will reduce the length of the room to 2 meters. I draw the picture. Unfortunately I need access to the outer wall, because there is a valve for the water, so I must reduce the length of the room on the other side. But I have another question. Will it be OK if I reduce the length just with one gypsum board? Does it matter how thick the wall is, or is just the type of surface important for reflection? Here realtraps.com/art_surfaces.htm I read about reflection of different materials, but there is the data only for gypsum board on masonry, not the gypsum board itself. Is the reflection for the gypsum board itself similar to the gypsum board on masonry? And for the angled walls... will it not help even a little bit?