I was trying to figure out what would be the best way to place panels in my room. I live in an attic and it's an irregular shaped room. How should I place the panels in the corners? Should I have the panels run flush on the walls leading to the corners or should I have the panels canted covering the corners. The walls are weird but I don't mind creating panels to match the shapes. I've also attached pics of my room.
I'm getting some genelec monitors and subwoofer - the 8340's and 7350. Respectively, should I get smaller size drivers or should I just just buy these? I understand that smaller drivers don't hide sound anomalies in the room its just size controls how apparent you may hear those anomalies.
I'm not sure I could help you analyze this room given its shape. What I can say is that the purpose of absorption is to 'make the walls disappear' as it were. Corners have a bigger buildup of bass so making those disappear is a big priority. You have a lot of corners so you need a lot of absorption - just as anyone does.
You also need some kind of reflection-free zone. Additionally, the various angles will create their own standing waves which must also be mitigated. Long story short, place thick treatment everywhere! If anything, it can be a bit thinner on the flat surfaces. Given that, you could sort of 'even out the shape' with insulation. What I mean is to create a usable rectangular space within that space and fill everything outside the boundary with insulation. That's probably the best you can do.
If you read all the stickeys and all Ethan's material you will find that with peaked ceilings, placing absorption across the corners in the ceiling as well as all the other corners it what is needed as well as RFZ panels a Hexspa also mentioned. Covering walls and ceilings is good too. So in short, absorption is the answer... don't be shy.
This photo from the RealTraps site is also in my Audio Expert book:
This is the book's text that goes with the photo:
One of the most common “odd”-shaped spaces to treat is an A-frame room with a low ceiling, such as an attic or a bonus room above a garage. Both have angled side walls, though all the usual principles still apply. Figure 21.24 shows such a space that’s been treated fully. Broadband absorbers hang below the ceiling to avoid the focusing that would otherwise occur, and the side-wall reflection points are likewise fully treated. Although the side walls are angled severely, the corners formed by each side wall and the front wall are still 90 degrees, and so benefit from bass traps straddling those corners. Those two front corner bass traps have reflective membranes, as does the partially hidden trap under the peak directly above the window. The remaining panels are all broadband, without a membrane, to absorb mid and high frequencies.
Thanks Ethan! Also, I have the book; what page lol?
Also, will the exposed part of the front wall above the window cause problems? Will there be bass build up in those exposed parts of the corners above the window or will that not be a problem. I understand that every nook and cranny of a room does not have to be covered for effective absorption, so I guess that's why those parts are exposed. I think I read somewhere (I think from your book lol) that you need at least 25% of the room covered. If you were to fill those exposed parts in the picture on your response post, ho would you cover those spots?
On page 512 of your book and figure 19.5, would I be able to run panels flush (adjacent) on the walls in my attic instead of having the panels straddling the corners like the picture in your response or figure 19.4 on page 510 in your book.
Before Ethan answers, I'll say this: panels go in two locations - 1. Where they work best and 2. where they fit best. Sometimes those are the same spot, sometimes not.
The layout he's shown looks good but the particularities of your room may demand some adjustments. The best way to determine whether you're adjusting effectively is measuring and keeping the basic principles in mind.
I will definitely take that into consideration. Also, what would you all recommend as far as FRK panel placement on the walls in my room. Since I have a low ceiling, should I place panels on the ceiling and the sidewalls that don't have foil membrane facing the room or should I have a mixture of panels that have foil facing the room and panels that don't have foil facing the room as well? I understand that FRK panels may control liveliness but my room is small and I have a low ceiling so I think panels without foil facing the room may be effective. Also, I did a simple mirror test and it looks like I can see a reflection of my speakers on the entirety of the sidewalls. FRK's on the sidewalls??
FRK goes not where the speaker's reflection is visible from the listening position. Everywhere else is ok assuming you don't need to minimize reflections in those areas also i.e. for live instrument recording.
FRK is going to help your bass but you might need the extra absorption that leaving it off can bring. Again, measurements are the surest way to tell. As far as FRK direction is concerned, either is probably fine but I only have experience with it facing the room.
One little detail about my panels: I put FRK on my super chunks but only at the top and bottom 2' so that ear height when seated and standing is unfaced. By doing this, I got the benefit of recording-level midrange absorption but also the FRK assistance where bass is more likely to be building up. Since everyone seems to think it's 'the whole panel or nothing', you can consider this too.