Checking for the monitor placement and bass traps

Hi everybody ! After writing many topics about my project (viewtopic.php?f=3&t=11357&hilit=choosing), here is the final "design" for the bedroom I would like to use as a home studio. * I can't drill any hole in the walls and ceiling, I can't built a soffit, so here all the bass traps are mobile and removable: -four bass trap on the side walls, two are mobile (one in front of the window at left, and the symmetrical on the opposite wall), which can be moved between the side wall and the others bass traps (at which is attached the cloud) : - at the rear right corner, the superchunk is replaced by a mobile flat trap (which is inclined) and fixed to a mobile wood panel. Behind this mobile trap there is a big cupboard : * All bass trap are 100mm thick, except the clouds which are 75mm. some of them will be covered with a plastic sheet all around the wool so as to keep some liveness and reverb. * There is a pair of active EVENT TR8 monitor ( which are my main monitors), and my old pair of Tannoy Reveal which I would use to complete the EVENT. * I'm mixing especially House and electro music, so I'm looking for a precise and clear low end. top view, with the cloud hidden: So, what do you think of this design ? what could be improved ? I'm just wondering about : - early reflexions problem because the monitors are very close to the corner and a part of wall without bass trap. - does it need so much bass traps on the rear wall (does the bed act as a kind of horizontal superchunk ?), or it would be better to absorb a lot around the speakers and less in the rear of the room ? Thank you very much for your help !!

Well, the way I see it, that sure looks like a decent plan to me, especially considering your limitations on attaching things to walls and ceiling! My only comment would be that your wooden framework will probably need some kind of triangular bracing where the verticals meet the horizontals, for sturdiness, but apart form that it looks good. I like the idea of the hinged bass trap on that rear plywood "door". That makes sense. Have you thought of a method to damp any resonance in that plywood? It might not be a problem, but it might be worth thinking about in advance, so you have a plan if it does turn out to be an issue. - Stuart -

Overall, it seems like a plan. Since your room is small I'd suggest covering, *at least*, the corner traps with plastic to keep it from sucking to much mid/high frq. You can't have too much bass absorption (in a small room) but you sure can have too much broad/mid-band trapping!

Hi guys ! Thank you very much for your replies !! * About damping the resonance of plywood, I thought that the trap hinged to it would act as an absorber because of it mass.. but maybe it would be necessary to make it thicker (it is 15mm thick here on the drawing), or to add some "wales" (straighteners? I don't know its name in English :roll: )... how would you calculate the resonance frequencies of that kind of plywood ? (if it is 90 cm wide, 250 cm high and 15mm thick). * so as to limit the mid/high frequencies absorption, are you sure that only wrapping the wool in plastic sheet will be enough to keep those frequencies? .. I'm thinking that there is also a paper sheet glued on one face of each wool panel too... Some questions : -> What about the lack of absorption around the speakers ? is it really important to have maximum absorption on the rear and sides of the speakers ? -> Could it be a problem if the Tannoy speakers (the red face ones) are as close of the Event monitors as it is on the picture ? (-> phase problem in the low frequencies ?) -> Have the cloud panel to be on top of the speakers and on top of the mix position ? here is a new version : thanks ! :)