Hi Christopher,
The ACE400 is a great little speaker and some customers have installed it in areas like bathrooms. Keep in mind, however, that this speaker is not specifically treated for moist environments like the OSD ICE600WRS. If you decide to go with the ACE400, consider adding a layer of clear coat (spray can only) to give the speaker extra protection and silicone around the trim, against the wall. Good luck on your project!
MA/ CL