Measuring brand new music room

Acoustic treatment and room tuning are one of my favorite things. 

REW is great free software for that purpose. You get all the measurements you need with one sweep. A calibrated microphone can be had for about $100. It's important to compare left and right separately and together. 

There are tutorials on YouTube showing how to set up for measurements. I can't vouch for their quality. 

FWIW, you can take screenshots of all the graphs on REW, upload them to your choice of AI, and ask for an analysis and recommendations. I've used Gemini but Claude might be even better. 

Finally, GIK Acoustics makes a lot of good acoustic materials at a reasonable price. They will also analyze your REW data and make recommendations. 

Good luck. It can be a lot of fun fine tuning your room. 

Building a new space, dedicated to listening:

Stop the workers, perhaps, rather than sheetrock, change the type of finish, but you need time for research.

Adjacent spaces, you need to solve sound transmission

In the room, you need to solve sound absorption, diffusion, reflections

Sometimes, to solve both, double walls, with staggered studs are best.

Don’t forget the ceiling and floor materials.

An Acoustic Consultant, right now, might be the best solution.

Where is the new space? perhaps others can recommend someone.

ps, now's the time to solve wiring of all types, and sound proofing around outlet boxes

Another question to be answered? Is the room a designated space in the new home not built to your spec' for the usage as an audio entertainment space?

If Yes, then it is not possible to see how a redesign of the structure can be done without major disruption to the use of the space and adjacent space.

I suspect there is a dedicated space within the home that is produced using commonly used building methods and materials.

I have a dedicated audio entertainment space in my home, which has room treatments in use. As it is my own space, I am able to produce my own DIY designs with little concern for the aesthetic. The design for these treatments are easily treated to be a more eye friendly finish.

What really matters is that commonly seen methods used to improve a room's modes (interface with sound created), is easily achievable. The results to be had are in my case well worthy of reporting back on..

In your space I feel confident there is an option to select more than one positioning for the Speakers in relation to either of the side wall dimensions. Once the room is set up to your liking, have the room measured, with a Mic' and Computer Software Programme and it is a very good place to learn where to create a control measue.

How much one wants to invest in acquiring a control measure is their choice. For myself the DIY route has worked wonders at a fraction of the cost of a commercially offered product. If I were to invest another £100+ a fabric with a very nice weave or print could be added. If I were to push the Budget further, designs like the ones seen in the link can be used. 

 https://www.facebook.com/marketplace/item/1485785179856072/?ref=marketplace_profile&referral_code=undefined

I hired @kevinzoe to take my REW measurements and deliver actual solutions/remedies, remotely, and therefore very cost effectively.

Here is the output / report. You won't get this from GIK, or any AI. (Not dissing GIK they are great to work with) 

If you are going to do the measurements yourself, why not measure now!

Now, I would run a mode calculator before you add the furniture in case you can make some "structural" changes now and save money later. 

My prior room we did that and ended up building "pockets" for in wall traps, and a large in ceiling trap plus corner bass traps built in.  (yes I was single)

Current Room's dimensions were calculated before the house was built.  3 walls are exterior and one interior.  That one has double offset studs and its filled with insulation.

Food for thought!