Deane, you should NEVER place the Bose L1 Compact on a table. This results in the loss of the sub-woofer sounds. Additionally, those extension sections are what provides the mid range and separation from the bass sounds and at least one should be used, but preferably both. Believe me, your audiences will know the difference when they hear the system set up like this.

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.)