HELLO BOB:
I AM WRITTING TO YOU FROM PUERTO RICO. I WOULD LIKE TO KNOW HOW TO SOUND PROOF A ROOM FOR MUSIC PURPOSES. ITS REALLY SMALL SPACE, 7'6" X 4'7".WILL APPRECIATE ANY HELP. WHAT KIND OF MATEIAL DO I NEED. THE ROOM IS IN CEMENT AND IT HAS AN OPEN SPACE THAT I WILL HAVE TO CLOSE WITH PLAYWOOD.