Very nice transducers john....Given the dipole dispersal pattern of your planers and the reduced nature of interaction with your floor, as compared with conventional drivers, I doubt very much whether the casters will have any significant detriment to sound quality until you hit on their exact placement in your room and you can replace them with a more secure foundation method.
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Fear not....millercarbon will be alone shortly to persuade you to spend a small fortune on his patrons springy product range..