Forum, don't know how I did it but originally posted this to wrong thread
Eddie, just catching up on forum posts and saw this one. If your room has "pony" walls with a slant ceiling on both sides you may have an easier solution. Because of the slant ceiling it may have reduced standing waves. I had a room similiar to this and my solution was a dense carpet on the floor, then furniture, cases, etc went along one wallto break up sound, the end wall had a window so I just went extra big heavy on curtain material that I could open or close to expose the window therefore open and close as needed for sound dampening. The other end of the room had the door so all I did was leave it open. The sound was pretty good, except mom and the kids definitely knew there was a drummer and bass player upstairs. Good luck in your search for the holy grail--good sound!DennisD

There are only 3 kinds of musicians: those that can count, and those that can't!
PC AMD A4-5300 APU 3.4 GHz, 8gb RAM, 1T HDD, Windows 10,
Reaper 4.77, BIAB2018, PTPA12, RB2018, Roland VS-880 DAW