I was almost scared to open this up in fear of reading some redneck hillbilly joke... whew!
1. No.
2. Refer to answer #1.
3. I guessed?
Okay... seriously... I got those from
Acoustics First and they are their Respond panels. At the time it was the cheapest place I could find them. Still not so cheap and I'm sure if you have the abilities you could build them for less.
I really had no ideas where to place them but from reading around I decided on the first and second reflection points on the side walls and then the rear wall directly behind the speakers.
But as I've stated elsewhere... I really couldn't tell any difference in the sound. I wasn't having any echo or too liveliness problems or at least I don't think I was. I merely wanted to see if it would help my sound. Yet, my ears are not that critical so they could be helping and I just don't realize it that much.