I want to ask for help. I have REW measurements, but I am not sure what the parameters and values are based on which I would be able to design a diffuser. QRD (1D) diffuser, what should I consider when planning? There are calculators for it, but which prime number would be suitable for me, and what frequencies should the calculation be made for? I would like to turn my living room into a stereo listening room. 4.5mx4.3mx3m Two adjacent walls are open. It has gateways. I want to completely cover the front wall with a qrd diffuser, but the details are missing. I am planning absorbers for the side walls. Thanks.

Not the answer you’re looking for, but the question you have to answer is ‘why’.

Every piece of acoustic treatment should be used to target a specific problem, and each room is different, so copying someone else’s room layout might not work. 

No one is going to give you a complete treatment plan with design criteria for diffusers and absorbers free. I’d recommend either reading up on your own (Master Handbook of Acoustics, Acoustic Absorbers & Diffusers, or Recording Studio Design) or hiring someone to take out the guess work for you.
 

Option 3 is blindly throw up treatments around the room and hope for the best 😉

old thread - but by far the best design tool for 1D and 2D Quadratic Residue Diffusers is QRDude

https://www.subwoofer-builder.com/qrdude.htm#google_vignette

Amazing free tool written by Collo.

 

On 07/01/2024 at 10:58 PM, olahpal82 said:

There are calculators for it, but which prime number would be suitable for me, and what frequencies should the calculation be made for?

QRDude will model all the variations, and show where diffusion starts and stops.

 

If you want to diffuse low, diffusers get deep.

You need to sit multiple wavelengths away from a diffuser based on it's lowest wavelength diffused (based on Cox and D'Antonio)

 

Mike