randy-11 makes a good point. The latest digital EQ technology is a great solution for bass correction if you don’t have an analog source (ie TT) that would do not want converted to digital. I would still deal with basic reflection issues using acoustical absorption treatments for best results.
BTW, o, Michaels, Hobby Lobby, and Walmart all have the supplies you should need to make "pillows".
As I stated much earlier, I had to go to a professional building supply warehouse to get the 2" thick dense fiberglass board recommended in the article you linked. Be sure to wear sufficient body covering, gloves, and a respirator when handling this stuff once out of the packaging until you get it completely covered with fabric.
Best,
Dave
BTW, o, Michaels, Hobby Lobby, and Walmart all have the supplies you should need to make "pillows".
As I stated much earlier, I had to go to a professional building supply warehouse to get the 2" thick dense fiberglass board recommended in the article you linked. Be sure to wear sufficient body covering, gloves, and a respirator when handling this stuff once out of the packaging until you get it completely covered with fabric.
Best,
Dave