Request for Help with Acoustic Treatment Solution

My wife and I are leasing a small house in a quiet, rural area for the next 6 - 8 months, prior to our moving to a larger city. I'm attempting to configure a media production workstation in a room which also serves as a home office and yoga space. :roll: Below please find two diagrams and photos to better illustrate the dimensions and challenges posed by the room. Music and soundtrack production are a significant part of my workflow. Most instrumental tracks are sequenced -- originating from sound libraries accessed through Logic Audio. Recorded live tracks consist of vocals, guitar and voiceover for animation. We never have occasion to record live drums or do any elaborate miking. We rarely record more than two tracks at one time. Though a better tracking room and reference-quality mix environment would be preferable, I am stuck here for at least several months and must make the best of the situation. The house is a conventionally framed, older cedar home on a stemwall foundation, built to code during the seventies. There is a 4-foot tall, unfinished crawl-space underneath this room and a second story upstairs. Not having access to the blueprints, I cannot provide information as to the internal structure of the floor, ceiling or wall cavities. Though sturdy in its construction, the home does not appear to be well-insulated. The dimensions of this rectangular room (feet/inches) are 18' 10" long X 12' wide X 8' high. The walls are parallel. The NE & SE interior wall surfaces are cedar paneling. The SW & NW walls & ceiling are textured sheetrock. There are openings in the NE and NW walls. The NW hallway opening is 3' wide X 8' tall. The NE Opening to an Adjacent Room is 5' wide X 6' 7" high, with folding doors (usually open) and a 1' 6" cedar header. The NE wall contains one window 4' tall X 36" wide (Window A) with a 1' cedar panel header. The bottom of the window is about 6" above the desk surface. The desk surface has a height of 29". The SE wall contains two adjacent windows 6' tall X 36" wide (Windows B & C). They have both a 1' cedar panel header and footer. The glass surfaces of these two windows below the desk surface are partially obscured by wooden, under-desk shelving and their contents. The NW wall has a mirror 5' wide X 4' high. It is 1' 4" below the ceiling and 2' 8" from the floor. It is 5" from the western corner. The desk surfaces are built into the walls -- immobile. I mix with near field monitors at very low SPL levels -- not much louder than a spirited conversation or slightly loud TV. Offending the neighbors, keeping studio sound "in" and external/outdoor sounds "out" are not concerns. My only concern is creating a reasonably effective listening/mixing environment. Given that the NW end of the room has been designated as a yoga/exercise area (by marital decree :shock: ), the seemingly obvious solution for this room would be to use the eastern corner (between Windows A & B) as the center point; pack the window recesses with sound absorption materials to minimize the reflective qualities of the glass; perhaps add absorptive panels in front of the windows; place the speakers symmetrically from this center point; and assemble the workstation and video displays accordingly. (Diagram A) Then add additional acoustic treatment as needed. This area however, is also being used as an office. Though permanently blocking Windows B & C is not a problem, Window A needs to be accessible when the space is being utilized as an office, for both light and ventilation. Perhaps there is a way I can make a panel which can be slid in and out of place in front of Window A. Perhaps something hanging on a ceiling track that can be slid into place, or maybe some super-heavy curtains that can be opened and shut. As an alternative configuration, I've tried locating the speakers on either side of the keyboard, facing the SE wall. (Diagram B) The challenges are easily apparent -- the close proximity of the speakers to the SE "rear wall" (8') with Windows B & C, and, the lack of symmetry in the placement of the speakers (freestanding left speaker versus location of right speaker next to shelving). The HR824's audio monitors do have placement adjustments for freestanding versus flat wall versus corner placement but I don't think that's a true substitute/solution for real symmetry in placement. This proposed speaker placement in Diagram B raises concerns per standing waves; first order reflections off the SE wall; and loading of the east corner with low frequencies. Another, minor annoyance with the Diagram B configuration is the necessity to look to the right in order to see the computer display when sitting in the mix position, facing the speakers, operating the MCU Pro control surface (which is on wheels and mobile). Regarding the room in general terms, the soft cedar wood is certainly less reflective than the windows, but the windows are clearly a problem. While the problems can be reduced by mixing at low volumes, acoustic treatment will certainly be required for the windows. I've considered building acoustic panels for the windows, to bass trap thickness -- either with OC 702 or something comparable. I'd prefer to use an absorptive material other than fiberglass based on the possibility of airborne particles, particularly per the panel being slid back and forth in front of Window A. Any recommendations for alternative materials would be welcome. That said, I don't want to turn this thread into a debate on the health effects (or not) of fiberglass panels. My questions are as follows: 1) Would you go with the approach in Diagram A or Diagram B? 2) How would you approach acoustic treatment ? (particularly in regard to Window A ) 3) There is a 5.5" cavity between the front face of the window sill mouldings and the windows' glass surface. If acoustic panels are the right solution for in front of the windows, would you leave the existing 5.5" air space between the glass and the back of the accoustic panel?... or stuff the space with soft foam panels or something similar to further dampen the space in Windows B & C? 3A) Is it possible that stuffing Window Cavities B & C, or building acoustic panel/traps directly into the recesses would eliminate the need to hang panels in front of Windows B & C? I ask because recessing the panels into the window cavities as a substitute for hanging a panels in front of the windows would yield a valuable 6" of space on the desktop surface. 4) Should a bass trap panel be configured to straddle the eastern corner? In the interests of saving space, would a sonotube filled with sand work versus an absorptive panel? I'd like to limit sound treatment expense to under $800 if possible. I'm very handy and happy to build things from scratch per the excellent tutorials available in this forum. Thanks to any and all willing to take a go at this.

Aloha, A couple of thoughts... - you may want to move your mix position out of the corner due the the bass build up - because you don't want rear reflections to interfere it is better to start with a longer front to back dimension than the side to side dimension Perhaps an adaptation of John's corner design would suit your needs? Aloha 8)

i think if you put the monitors in place (facing out like Kendale's showing) as if you had a corner control room and then add the treatments, you will be better off than having them face the corner or sit next to the wall...