[saltysea]

Hello hello..

I'm in the process of partially rebuilding my studio which is housed in a concrete slab commercial building.
(studio is predominately a mix room .. audio post and music)
At present the walls are drylined with 2 sheets of 1/2" plasterboard on each side.. no green glue and nailed to 3"x4" stud work. It was all built in a hurry a few years ago without much insight into soundproofing construction. Needless to say the room is not really soundproofed at this time!
So.. I'm attempting to achieve this through a partial rebuild. I had someone come in and give me advice which included the following ideas.

Remove the internal plasterboards and fit new ones on a resilient channel system.... 3 layers of different thicknesses (with green glue coverage in between them)

Build a floating floor system which comprises (top down) of 25mm plywood, Mass loaded vinyl, quietboard (cement impregnated board), another layer of mass loaded vinyl, 25mm of MDF all bonded together on a timber frame which itself is sat on a bed of rockwool.

Acoustic treatment proposed includes super chunk corners, large limp mass bass traps behind the stereo monitor positions, a number of broadband traps for other corners and walls (about 11 in total) also.. a quadratic diffusor between the stereo monitors on the front wall- centre.

I wondered if any one here had any comments on these ideas ? and as I'm just putting together a spreadsheet of costs (and thinking about new eqp costs on top!) I'm wondering if I can economise on some of the design.

specifically
1) what do you think the impact of reducing one layer of plasterboard would be? i.e. just 2 layers on the inside with green glue between them.

2)Also I read a proposal for a floating floor on the green glue website that looks quite attractive in terms of cost and effort involved.
It suggests using some sort of resilient layer (it doesn't specify what) on the concrete floor followed by a floating raft comprising 2 sheets of OSB with green glue (of course) sandwiched between.
Could this solution be anywhere near as effective as the one I was given?

I should also say that I plan on using a subwoofer some of the time (monitoring with PMC TB2s x 5 + TLE 1.. also have Dynaudio BM15a but might be retiring them after the works)
I'm concerned about how the floor will effect that too... any thoughts on this?

To put my space into context ..it is in a pretty quiet shared 2,000 sq foot space. the main unwanted sounds I hear inside at the moment are footfall .. some particularly noisy heels that people wear on the exposed concrete just the other side of my wall!

I'm attached a couple of pics of the space .. main room dimensions are 4.4 meters long (max) by 4.1 metres wide (max). Small adjoining room .. ( to be either a VO booth or monitoring space if I record people in the main space) is 2.1m x 1.8m

one last question..
I was thinking of constructing the bass traps/ absorbers myself but when I look at the costs and the time involved in making them I've been wondering about the ready made products.. would there be a massive advantage in building the traps myself? should I wait until the super chunks are installed.. do some measurements and then take it from there?

apologies for using both metric and imperial through the post.. all thoughts most welcome and very appreciative of your time!!
all best
dennis wheatley