You can also minimize the volume level during break-in by connecting the speakers intentionally out-of-phase. This cancels a lot of the sound. If you have an FM tuner or a loaded iPod, that's another way to send uninterrupted program material to the speakers. You don't have to have the volume way up to break them in. In fact, Mirage recommends keeping the volume low until they've broken in.
My OMD-15s broke in pretty easily. They never sounded harsh or wrong out of the box as some do. But the first 30-50 hours opens up the bass response, and I found that as I kept playing them (for weeks), the resolution exceeded my expectations. These are very resolving speakers. They'll sound pleasant from the first, dynamic soon after, add bass slam soon after, and then over time you'll notice how delicately refined and nuanced they are as well.
My OMD-15s broke in pretty easily. They never sounded harsh or wrong out of the box as some do. But the first 30-50 hours opens up the bass response, and I found that as I kept playing them (for weeks), the resolution exceeded my expectations. These are very resolving speakers. They'll sound pleasant from the first, dynamic soon after, add bass slam soon after, and then over time you'll notice how delicately refined and nuanced they are as well.