Garage project studio conversion - advice needed, please

Hi all I have started a conversion of our garage into a project studio. Foolishly i began without really doing too much research into acoustics (apart from my own very basic knowledge) and as a result i now have a low ceiling (230cm or 7.5 feet), which could have been improved with a bit of extra digging while we were doing the concrete floor. I would massively appreciate some advice at this stage, to ensure i salvage as good as possible a sound out of the place. The studio is mostly going to be used for producing/mixing with occasional recording of vocals, i can either build a small vox booth or just record in the control room with a portable booth of some kind. I use 6.5 inch monitors (genelec 8040a) at the moment We have put in a stud wall, 100mm of rockwall RWA45 on external walls and ceiling, and finished with Gtec DB which is a high density, acoustic plasterboard. The floor is: damp proof membrane, concrete, screed, another DPM, polystyrene insulation then chipboard flooring. At this point the external walls are finished with plasterboard, as is the ceiling. I haven't put in any internal walls yet, and it is this that im struggling with. Ive been looking at the real traps mode calculator but would really appreciate some thoughts on what the best way to setup would be The plan below was a rough idea. No internal walls have been put up but the door and 2 windows on the external walls are of course fixed. However all dimensions are accurate. Im open to moving the mix position around, and i dont need a vocal booth, the most important thing is getting the best mix sound as possible. One thing to bear in mind the roof slopes down 10 cm towards the 3.94 marker One alternative that has been suggested is rotating the mix position around 90 degrees so that im facing the 3.94 marker, Then the dimensions would be 479cm x 358cm (+/-) x 220 cm (climbing to 230 cm other end of room) I can build false walls if needed Thank you

Hi Chris, and welcome ! :)

and as a result i now have a low ceiling (230cm or 7.5 feet)

Is this a control room, or a tracking room?

We have put in a stud wall, 100mm of rockwall RWA45 on external walls and ceiling, and finished with Gtec DB which is a high density, acoustic plasterboard.

Is that inner wall decoupled from the outer wall? What is the outer wall made of?

At this point the external walls are finished with plasterboard, as is the ceiling. I haven't put in any internal walls yet,

Ummmmm... I really hat to say this, but those sure look like inner-leaf walls to me! :shock: The outside view of the studio shows that you most certainly have an outer leaf there, which connects to a brick wall on the left, and the second photo shows that you have drywall (plasterboard) facing towards the room, so you also have an inner-leaf... so you are out of walls already! If you add any more walls, you will have 3-leaf or 4-leaf system, with the accompanying low frequency isolation problems always resulting from such walls. So if you do indeed want to add internal walls, then that implies that you will need to disassemble some of what you have done already. This is how studio isolation is supposed to be done: In other words, you have your outer-leaf framing with mass on ONLY the outside of that, facing the real world, then you have an air gap, then you have framing for each of your internal rooms with mass on only one side of each frame. If that is not what you are planning to do, then you are not doing it correctly for good isolation. I would suggest that you first fix that before moving forwards. Fortunately, you are not too far advanced to do it right. - Stuart -