Advice on placement of acoustic treatment (Rockfon)

Hi all, I got an expensive SPL meter to borrow from my school and they had heaps of rockwool for ceilings they didn't use anymore.. I could take them away for free! I could cover pretty much my whole room with it, I'm covering them with felt so they look better and don't give off dust. So I did a test of my room in the current situation and would to have advice on how big, how thick and where I'd best place my pieces of rockwool. I made some pictures of my room to explain my situation. will make a video too! and here are some pictures first The stuff: http://img153.imageshack.us/img153/7973/foto1051t.th.jpg http://img59.imageshack.us/img59/4908/foto1060e.th.jpg piece 1 glass is bad for the acoustics right? I placed a piece of rockwool to block most of it. Did some filling of my doorstep, should I put a big piece on my door itself too? Should I throw the dark ones away? My testing setup: http://img651.imageshack.us/img651/4807/foto1061a.th.jpg I used the Standard ST 8850 SPL meter in C weighting mode on soft mode (35-100dB), with fast response. Is the cabinet where my mic is on of big influence? is the angle of my mic right? What do you think of these results? How can I improve them during nifty placement of the Rockwool? Should I put on the ceiling? http://img818.imageshack.us/img818/4818/48535567.th.jpg http://img248.imageshack.us/img248/4375/32009928.th.jpg http://img833.imageshack.us/img833/8189/45540266.th.jpg http://img46.imageshack.us/img46/6808/42682208.th.jpg http://img94.imageshack.us/img94/5470/11162368.th.jpg http://img51.imageshack.us/img51/9669/39450232.th.jpg http://img191.imageshack.us/img191/4002/66142440.th.jpg So it appears my bass region is pretty flat except for a small peak around 67 hz and a huge dip ranging from 70-100 hz, and it is lower comparing to the highs. The mids are also a little indented. how do I fix these problems? I'm the most concerned about the big dip in the 70-100 hz region. and how would I stick the rockfon on my ceiling? should I cover my whole ceiling or partially? if so, where and how big should the plates be? a schematic of my room is here http://img39.imageshack.us/img39/2899/roomplaatje.th.png Thanks!

you might consider swapping the cabinet and the bed and move the glass cabinet further away. stack the corners of the room and treat first reflection points, consider a cloud over the mix desk. consider some free standing absorbers behind your mix position to reduce some of the reflections from the back of the room but also treat the corners in the back, plus consider ceiling-wall "corners" as a place for additional absorption.

Why did you post this exact same question in two different places in the forum? Please only post your questions in ONE place. - Stuart -