I am planning a dedicated theater in the space above my family room. Would like suggestions for soundproofing the floor that would not be too expensive. Was considering putting black board down with 3/4" subflooring over it. Will use a thick carpet pad and decent carpet for floor covering. Any suggestions appreciated and comments on my thoughts---Thanks JH

come-on guys--I know some of you have some great advice I can use about this. Am planning to start my project soon--would love to get your input---Thanks---jbhxray

The usual floor recomendation is a product called acoustik mat. Not too cheap from what I hear. Run a few searches, it is a heavy rubber underlayment. There was a thread on using some tractor shop stuff as an alternative, but not sure if you'd get the performance out of that.

Here is a link to the archives:
http://archive2.avsforum.com/avs-vb/showthread.php?t=457845

Here are some pics:
http://matt-hamil.smugmug.com/gallery/14922/1/492255#492255