Acoustic panels for my room

How thick are you wanting to make them? Once you start getting thicker then about 6-8” you can use less dense material, that has less flow resistance. Like Roxul Safe n Sound

I'd be looking at Safe n Sound or even attic insulation (pink fluffy, as it's generically called) if you're talking about that sort of depth.

Go here to play around with absorber depths and gas flow resistivity (GFR) values to determine the best GFR for the depth you want. The thicker the trap, the lower you want the GFR to be. GFR kind of sort of correlates with density, but not exactly, so the lower the density, the lower the GFR tends to be, but you still really want to choose products based on demonstrable GFR values.

www.acousticmodelling.com/8layers/multi.php

Then go here to see what product has the appropriate GFR, that is available for purchase where you live. On the last few pages of this thread, is also a few posts where the relevant spreadsheet is updated and linked, where the everything is listed.

gearspace.com/board/studio-building-acoustics/625978-common-gas-flow-resistivity-numbers.html

Curious -- are you going to cover all your walls with the panels?

You have a good plan, linas, and YES cover them! Two layers of a durable cotton blend upholstery fabric from any local fabric/sewing outlet store. There's always one with 5 miles of a retirement home as old ladies love to sew! (and so do I even though I am neither old nor a lady HAHA)