Owens Corning 703 vs. Roxul Safe 'n' Sound?

The amroc program is exactly where I learned of all the modes/nodes in a room! What a great aid in understanding what's going on in any size room, and where acoustic treatment will give the most results. I hadn't seen Ethan Winers article, so thanks auxinput. I'm gonna read it right now.

Ethan has a Manufacturer's forum section on audioasylum that is full of great info relating to room acoustics and treatments. Much of the content is many years old but still among the most helpful I've seen. 
Lately, I've seen his name brought up in some controversy on other topics which I don't recall, but regardless, he is a top educator on room acoustics and he donated much time and energy in helping other with similar situations. Cheers,
Spencer

Thanks a million Spencer. Yeah, I've seen Ethan, an objectivist, and some subjectivists get into squabbles on other sites. He's a "If you can't prove it with measurements, it doesn't exist" kinda guy. That's fine with me when it comes to acoustics!---Eric.

I want to add some information regarding acoustic panels with a wood backing.  I got my order of Rockboard 80 (6 panels).  Two of the panels I was making for another room and I glued 1/4 plywood to the back and then wrapped it with Gilfurd of Maine fabric.  The back panel would allow me to hang it on the wall.  In between the time I was waiting for more fabric, I used these in my audio room.  I found that there was a ringing/blare in the midrange area that was being influenced by these panels.  Through testing, I swapped out other panels and determined that the wood back on the acoustic panel was resonating -- even when the board was on the back side of the fiberglass.  The blare/ringing definitely bugged me.  Long story short, I don't recommend the use of acoustic panels with a solid wood back.  Having a square frame around the edges is okay, but no large surface area that can resonate.

That's great to know aux. Both Acoustimac and ATS offer their DIY panel frames with or without back panels. Without it is!