Here is what Mark Fenlon says about breaking in his drivers. If you look up his old posts on another audio board, you can learn about the design of these drivers and why they need careful break-in.
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Please run in the latest Markaudio drivers:
1 - First 100 hours - low volume music only. The music should be general/vocals with modest bass. Please don't use any artificial and/or single tone signal signals this risks creating a memory patten in the outer 7 to 10 micron cone substrate. You can run the drivers in free air or near free air, but pay attention to the physical movement, the driver's power-train should not move more than 1mm.
2 - From 100 hours to 300 hours, gradually increase the load to normal listening levels. Typically and depending on room size, the volumes should be around low 80's dB near constant loads with peak loads not exceeding 86dB. For those without any SPL measuring equipment, set your system to moderate listening levels. You should be able to hold a conversation without raising your voice while the drivers are being run.
3 - From 300 hours out, the driver's power-train will enter its optimal load phase on its suspensions. Markaudio driver suspensions are critical components as they have to cope with long-throw demands of the cone/coil. I recommend some care from 300 to 500 hours as fully optimised suspensions will give you many years of reliable service life. Bass loads are available but go a little easy on the volume until passed 500 hours.
Remember fellas, Markaudio drivers are "long throw" light load units. They will give you allot of wide usable band width but they aren't designed for near constant maxed volume "rock un roll". The latest models have built-in arrestors to help avoid damage from accidental over-load, so this helps but its not a replacement for commence sense operation of these types of drivers, be they Markaudio or other full-rangers.
Hope this helps.
Thanks
Mark.