I have two Sunfire subwoofers stacked. They are not magnetically shielded, and I have been concerned about magnetic interaction in stacked configuration. Putting some steel in between the subs would make sense theoretically, to channel the fields and minimize field leakage into adjacent subs. I chose VPI Magic Bricks for this. Of course, there are less expensive alternatives.
VPI Magic Brick or Webster's Dictionary
Wondering: What's the difference between placing the VPI Magic Brick and Webster's Dictionary (Unabridged, of course) on top of your CD player? Would the latter give me more definition? Okay, okay, I'm sorry. Seriously, though. What would the difference be? This from the Department of Snake Oil.