Many PLL's in pro audio are designed to filter out unwanted signals that are outside of the desired bandwidth, although some are configured to filter out unwanted harmonics that lie within the signal's frequency band. The biggest problem with this theory is that we know nothing about the PLL filter in question it's completely hypothetical. In addition, the simple act of accepting the incoming signal and creating a new signal that's in phase will add some jitter. Some folks maintain that there's no basis for it that it's a sort of modern "emperor's new clothes." The reasoning behind this is that the device being clocked externally will simply filter the incoming clock signal through its phase lock loop, thereby eliminating any sort of benefit associated with the superior clock. External clocking is certainly a hot button issue. When we introduced the Micro Clock mk2 we didn't anticipate the amount of demand and controversy that managed to accompany it. Because of these technological advances, the Micro Clock mk2 is one of the best performing external word clocks within the pro audio market today. These are musically unrelated signals that create distortion and phase cancellation within the converted audio signal. In addition to this, our proprietary noise reduction circuitry dramatically eliminates the unwanted switching harmonics normally found in digital signals. It features ultra-low jitter third order crystal oscillators with a revolutionary patent-pending high current parallel drive circuit designed to increase the amount of desirable harmonics within the clock's spectral band. The Micro Clock mk2 is a radical departure in design from its predecessor. Introducing the Micro Clock mk2, a completely revolutionary design in external clocking from Black Lion Audio. Less than 10 picoseconds of accumulated jitter measured using a delta Jitter: Maximum 1 picosecond of intrinsic jitter,
Sampling rates: Six selectable rates, 44.1 kHz-192 kHz Output: 3 BNC with fixed 75 ohm terminations 5 volts peak to peak