Ordered DIY panels for our Fireside room (approx 30x35). Used the online calculator and then spoke to a sales rep. They answered all my questions thoroughly. Our room has a hard surface floor and drywall walls and ceiling. The echo in the room was a real problem especially for our senior citizens. We hung the panels and people are amazed at how much better the room is! The diy panels took about 8 minutes each to assemble. They have a youtube video showing how to cover them in the fabric. Definitely worth the savings for us. We used a laser to get a straight line around the room and installed 31 panels in less than 3 hours. Highly recommend.