Advice on studio build needed!

[Xen Ochren]

Hi all, I have posted a few times for advice in building a studio, I am in the
early stages, but hurrah, we have secured a venue!

It does have some shortfalls, and instead of changing venues to find the perfect venue, we are going ahead. I am hoping in this thread to get a basic idea of the expected potential results.

Attached is a floor plan of a section of the church which we are using, the specific room temporarily titled 'multi purpose room'. It is a small space, with high ceilings and double brick. 6.6 metres long, by 6 metres wide, 5 metres high. Floor is a concrete slab.

The two doors will be bricked up and 1 new door installed, I expect to go for a purchased acoustic door, at the same acoustic rating that I can get the walls to.

The windows need to be kept as is for heritage reasons, so will have to be boarded up from the inside (advice?) They also need to have as much acoustic dampening as possible, as across the road from those windows are the neighbours.

Yes its a residential area, but no train or tram lines, no plane route overhead.

the ceiling will need to be completely replaced.

I will need to choose a location for a air conditioner/ventilation unit.

I understand that double brick, rendered both sides will hit an STC of 57 or thereabouts?

So the problem areas are,
the ceiling, windows, door, and ventilation point. So far my thoughts on how to deal with these are,

I believe the ceiling will need to be twin leaf, double layered 16mm plasterboard with green glue.

I would assume anything across the windows will need to be the same, perhaps the first leaf across the windows alone, and the 2nd leaf over the entire width of the room, connecting with the inner leaf of the ceiling, and the 2 other brick walls.

The door I will just pay the cost of a commercial acoustic door.

The ventilation I have not researched much on yet.

So whats the room for I hear you ask?

My personal passion is mixing, sound, composing for screen, and I write dance music.

however we also want to record in this space, to a moderate quality level. acceptable quality equipment, with a quiet room is our goal. We will consider a dedicated vocal booth. We may consider splitting the room into two for a mix space and a live room, but would prefer to go for a single room design to reduce cost of building interior walls.

I use PMC TB2's. I don't have the matching sub, but will be using a cheaper one at some stage. Other people in the facility want to record in the space, and we want to aim for a high quality on internal acoustics/soundproofing, with a single small room design.

These monitors should not be soffit mounted due to the rear firing transmission line port, so I can't use any of the mix room designs I've found on the John Sayers forum, they love the soffits there. Can anyone link to any starting point designs for mix rooms? If I am going to be building a new plasterboard wall across the windows, I need to know if I should put it on an angle to remove the parallel wall factor there, and if I do, should I be doing it with any other walls.

This is a first time project for me, and any advice would be highly appreciated!
If I can do it, I want to sound proof this enough to be able to use the space late at night, and even during the church service in the main hall. I know this may be impossible, but I'm going to try get it as close as possible.

Cheers for any support you can give!
Evan

[Xen Ochren]

Perhaps for a 2 room design this one attached that has been linked to before on this forum could work,
however as I can't soffit the speakers I am stuck!