![]() In the nascent days of digital audio, the early (primitive by today’s standards) converters had “sketchy” clocks, and there was an immediate sonic improvement when connecting to a low-jitter external clock. There are separate Pulse PE-65612NL digital 1:1 isolation transformers for both the AES/EBU and RCA S/PDIF outputs, while a third Pulse T3001NL isolates the 75-ohm BNC clock signal going to the six BNC line drivers. The MkIII steel clam-shell case has an overall DIY build quality, but the inside reveals an Atmel SAM3X/A Flash microcontroller and Silicon Laboratories’ Si530/ 531 XO crystal oscillator chips with onboard DSP phase-lock loop circuitry. Jitter, or the deviation from true periodicity of an ideal and perfect clock signal, is specified to be 1.92 picoseconds RMS on the 75-ohm un-terminated BNC clock outputs. ![]() It has a dimmable large LED clock frequency display and a single front panel rotary controller to set any of eight clock frequencies, including: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz. It is capable of up to a 384kHz clock frequency out the six BNC output jacks the AES and RCA S/PDIF go up to 192 kHz the optical S/PDIF output is good to 96 kHz. ![]() The Micro Clock MkIII simultaneously generates AES11 clock signal out an XLR 110-ohm balanced out and also S/PDIF clock out optical Toslink and 75-ohm unbalanced RCA jacks. It is the successor to the company’s Micro Clock MkII and adds a lower-jitter crystal oscillator, output transformers for galvanic isolation and separate, isolated output drivers for the six word clock BNC output jacks. Black Lion Audio’s Micro Clock MkIII comes as a one-third rackspace unit with external 9-volt DC wall wart power supply and 1U rack-mounting kit.
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