I tried 6" foam rubber suspended from the ceiling with some effect, with 4" foam on part of the side and back walls.
When I bought my new house, I made a deal with my wife, I got to do the family/dining room and kitchen and she got to do the rest of the house. To that end, I have bolted 2 king size mattresses to the back wall, and a queen sized mattress to each side wall. I then suspended the same foam from the ceiling. Amazingly clean sound source, but I am running a 500w output amp, with 440,000 microfarads of power storage into a pair of modified Whisper Legacies, full Valhalla/Odin loom for the mids and treble and LAT 12 guage speaker wire for the bass. I can turn it up to about 30% before I have to leave the room. Amazing sound. Cheap new mattresses are the way to go.
David
When I bought my new house, I made a deal with my wife, I got to do the family/dining room and kitchen and she got to do the rest of the house. To that end, I have bolted 2 king size mattresses to the back wall, and a queen sized mattress to each side wall. I then suspended the same foam from the ceiling. Amazingly clean sound source, but I am running a 500w output amp, with 440,000 microfarads of power storage into a pair of modified Whisper Legacies, full Valhalla/Odin loom for the mids and treble and LAT 12 guage speaker wire for the bass. I can turn it up to about 30% before I have to leave the room. Amazing sound. Cheap new mattresses are the way to go.
David