Check the listing for details. Black Lion Audio Micro Clock MKIII XB Master Clock. Condition: Very Good - Refurbished. Listed at 899.10 USD. Black Lion's Flagship Clock The Black Lion Audio Micro Clock MKIII XB is an ultra-tweaked version of the company's popular Micro Clock MKIII master clock. Through painstaking engineering, Black Lion reduced the jitter by two-thirds and spec'd their flagship clock with super-accurate crystal oscillators and high-caliber galvanic isolation, both of which contribute to the exemplary jitter performance. The Micro Clock MKIII XB's compact footprint and ability to drive up to 1,000 feet of coax make it an ideal solution not only for improving the conversion quality of an audio interface, but also for re-clocking digital consoles at live events or in houses of worship and as a master word clock in large post-production and broadcast facilities.