Scott,
Unfortunately, I don't have all the specs on the Radio Shack speaker, however, you may want to check with the technicians at
http://www.simplyspeakers.com and they may be able to render some assistance. Also, Pose replaced his mid speaker as well and says it made a world of difference. Might want to give him a call or drop him an Email.
As for the Pro-Look--I don't think it's an issue. Most audience members do not look at your speaker setup, and if they did the vast majority wouldn't have a clue. The setup is quite clean, no clutter, no stands to contend with and the mini-tower is held firmly in place with a patch of Industrial Strength Velcro.
Good Luck,
Gary
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Travlin' Easy
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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.)