DIY acoustic panels?

OP - I will load a pic of my diy stuff so you can see the pant material I am talking about . it will be in my system page .

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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

Can you sleep vertically on the mattresses? And do you think mattresses are way over-priced?

I got a fair amount of foam acoustic panels made up here. Price was good, but I think that also reflected in the quantity I was after.