You shouldn't have any problems, MDF is very stable and the veneer glues used today are fairly bulletproof. As long as the clearcoat finish is in good shape, so is the veneer. The worst thing you can do is get the speakers too close to the heat source or sunlight. Do not use cleaning/polishing products that say they will moisturize the finish (big pile of BS), contain petroleum distillates or silicone (Pledge), which leaves a greasy film and makes any repair/touch up very hard to do. If your speakers have an oiled finish then you will most likely want to re-oil them from time to time. Other than that, dust them often and enjoy your music.
Will low moisture harm a veneered MDF speaker?
My listening room is a finished basement with a wood stove. A hygrometer monitors the moisture level, it is mostly bottomed out at 20%; it is always that low during the winter. Will the excessive dryness cause any harm to my Dunlavy SC-IV.A's veneered MDF cabinets, or drivers?