The problem with elevating the system is that you lose the sub quality and sounds, which travel best at floor level. You may want to do what Don Mason did which was to use just a single extension and place the Bose directly at his sides.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)