I ordered three sets at one time and put them under all of my equipment. It certainly did open up the sound. I couldn’t believe how much it helped my bass. Because I put all of them into use at one time I’m not sure which component made the best use of the blocks, but I’ll be darned if I’m going to take any back out again to find out. I just want to listen. I still have some peripheral pieces that don’t have any blocks so I’m going to order some more!