Build My Own Room Treatments

Millercarbon
BTW - I'm liking my Hyperian MK II cartridge.  Thank you for that referral.

I have built my own using mostly Owens Corning 705 and 703.  I prefer to buy commercial products from GIK, because I don't save enough money to make it worthwhile making my own.  There is one notable exception.  There are back wall areas that I found needed treatment that were shapes and dimensions where  commercial products wouldn't fit or would leave too much exposed surface. 
It is pretty difficult to make bass traps.  Usually, specialized designs and technology is used for those products.  However, it isn't hard to make panels to address early reflection points that interfere with imaging. 

Sonicjoy is right.  Self education is the first step.

Brownsfan
Nice to know who you would buy from in the event this turns out to be a project that is taking too long.  Thank you also for your experiences.

I made my own acoustic panels out of materials described by Miller. The panel thickness varied based on where I was placing the traps. Thinner on ceiling and thicker in first reflection corners.

Milercarbon speaks the truth.

Couple other hints:
Home Depot will cut lumber to your dimensions to make frames for absorption panels.
Joanne Fabrics sells inexpensive fabrics to cover the Owens Corning panels

After that it is just your time with a drill, screwdriver, and staple gun.

Thanks for listening,

Dsper