as far as magnetic interference i have never heard of speakers interfering with each other. televisions yes. but speakers no. i think its pretty safe to say that the sub is not making the right speaker quieter. there isint really anyting wrong with your sub being places soo close to the speakers except that it might not be the best place in the room for it. i would want to make sure that the stand and sub werent touching though, just so that when the sub vibrates it isint rubbing up aginst the stand and stuff. is the right speaker significantly quieter than the left?
I built my rack and it uses that same design. its not as big though. You can make then any size you want. just as long as its big enough to be stable of course.
