Attic Shaped Studio

[gullfo]

yes, concave peaks will concentrate the energy - which is why locations like peaks, wall-ceilng, wall-floor, and wall-wall corners are excellent places to add absorption as modal supporting energies converge. getting rid of oblique and tangential modes will help even the space - sometimes as much as the main axial modes. in your case, the peak with the notches etc are currently scattering some frequencies and resonating others. filing those will attenuate those and the larger room volume will help slightly.

[endorka]

Thank you George. Yes, the amount of time, work (and sealant!) required for the necessary attention to detail is quite something, it never fails to surprise me even after all those years! It's also a working studio so I have to keep it open as much as possible even during these improvements. Regular clients are fortunately very understanding, some have even been in recently when there wasn't a ceiling

Cheers!
Jennifer

Source of the post I just wanted to peek in and say how inspiring your project has been for the duration. Both in terms of your attention to detail as well as a comfortable dose of reality in terms of the length of time projects like this can take. Thanks for taking all this time to share your journey!

-= george =-

[endorka]

Thanks Glenn, that all makes sense. I'm delighted to report that all that scattering has provided acoustic benefit for a band recording session yesterday, even in this unfinished state. I asked the drummer to setup underneath the raised ceiling. We got a really nice lively sound compared to the usual place at the back of the room, which is drier. Even the bass drum had more of a bloom on it. Nice to have the choice! There was also more space for the other musicians in the room as the drummer could sit next to the side wall rather than having to be some distance from the knee wall at the back of the room.

Cheers!
Jennifer

Source of the post yes, concave peaks will concentrate the energy - which is why locations like peaks, wall-ceilng, wall-floor, and wall-wall corners are excellent places to add absorption as modal supporting energies converge. getting rid of oblique and tangential modes will help even the space - sometimes as much as the main axial modes. in your case, the peak with the notches etc are currently scattering some frequencies and resonating others. filing those will attenuate those and the larger room volume will help slightly.

[gullfo]

coolio! once you do get the insulation up there and covered with cloth - adding slats will provide the scattering effect + some resonator effects.

[endorka]

Makes sense, thanks Glenn. I've been investigating the use of space couplers (like in Lester's room) in the ceiling for their scattering and possible absorption enhancing effects. The wells in these are about 75mm wide and deep. Ideally there should be space coupler, then at least 75mm gap, then absorption. The modules are 300m deep with 200mm absorption which only allows a 25mm gap if the space coupler is set flush with the ceiling. In visual terms I'd really, really like to do this... one reason is that people sometimes hear with their eyes when evaluating a room and the flush space couplers imply *something* acoustic wise going on behind the treatment in the ceiling. Acoustics is of course the priority, but if I can combine the visual and acoustic, it's a win win.

If I can get them flush with the ceiling it'll look something like this.

Cheers!
Jennifer

[gullfo]

coolio. most space couplers are typically ~100mm deep or so with some minor edge scattering at high frequencies. but if you have 75mm deep space couplers, then mounting them flush and leanving 25mm (e.g.) of air to the surface of the absorption should work fine.

[gullfo]

something like this

[endorka]

Lovely stuff, thanks Glenn!