Rick,
See GingivitisKahn's comments. I'm not the only one. That bow shoots good, but I don't thinkt it's excessive. I've given up on a basement range. I've got a bag target that I shoot into some, but there's too much risk of damaging something important down there. Two pieces will stop it, but I make a hole in the first layer every time I shoot and damage the second layer. Sooner or later, I'll send one out the back into something important.
It's not "cheap" carpet, but probably not the best in the world either.
If you're going to use carpet, test it first to make sure it will stop your arrows.