Analogue Balanced Input XLRs *
Description of audio port, level, headroom, no AD here, no advanced
Note: the analogue input signal will be disregarded when an AES-3 input signal is
present and locked.
Analogue Balanced Output XLRs *
This output is always active. Confirm that the correct digital headroom values are
being used (See “Advanced Operations”).
4 Advanced Operation
Zero Latency Monitoring (ZLM)
PUC² has a special feature which allows the user to monitor its input signal directly at
all of its outputs simultaneously. This bypasses the USB conversion and computer,
offering very low input to output times, typically less than 5 ms, even at low sample
rates. This can be turned on by closing the tip and sleeve (ground) contacts on the
3.5mm stereo ZLM switch jack on the unit. The USB sound output of the computer is
mixed into the input signal, and by default, both signals are dimmed (reduced in
level) by 6dB to avoid overloading the output stages. This automatic level
adjustment can be over-ridden by connecting the ring and sleeve (ground)
contacts on the ZLM switch jack, or by using a mono 3.5mm jack (or dummy plug) to
switch on ZLM mode.
ZLM Jack Tip (ZLM
enable)
ZLM Jack Ring (ZLM
Level)
Audio Signal at all Outputs
O O Computer audio output from USB
G O
Computer audio output from USB at -
6dB and selected input signal at -6dB
G G
Computer audio output from USB at
0dB
and selected input signal at 0dB
O G Computer audio output from USB
“O” = open and “G” = closed (connected to sleeve or ground)
Bypasses Windows internal kernels offering lower latency (delay) and bit identical
transfer between the software application and the sound card’s audio converters.
* not available with all versions of PUC²
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