ULN-2 Users Guide
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• Wordclock - indicates that system is being clocked from the wordclock input
• Digital In - indicates that the system is being clocked from the selected digital input (Optical, AES
or S/PDIF)
• Power — Indicates that the ULN-2 is receiving power.
• FireWire — Indicates that the ULN-2 has been successfully connected to either a USB or MHLink
Gigabit Ethernet connection to the Host computer.
• Locked — Indicates that the system clock recovery circuit is properly locked to the selected clock
source. If this light is not illuminated, the ULN-2 will not be locked to a clock and will revert to its
failsafe internal clock source. Even if the Locked light is not illuminated, the actual sample rate will
still be indicated on the front panel display.
• Digital I/O Section:
• The AES and S/PDIF lights indicate when a valid incoming digital audio stream is present. The
Locked light indicates when the digital receiver is locked to the incoming digital audio signal.
The ULN-2 front panel provides access to the level control knobs for headphones and for the monitor
outs. The headphone output jack is on the front panel and the monitor output jacks are located on the
back of the unit.
The headphone output jack is a TRS 1/4” jack that provides the Left Channel on the tip, the Right Channel
on the ring and the ground return for the two channels on the sleeve. The ULN-8 headphone output is
suited to a wide range of impedances. Headphones with lower impedance would be expected to get
louder than those with higher impedance.
The Monitor output jacks are balanced TRS connectors.
