27
Zero Latency Monitoring
Zero Latency Monitoring (ZLM)
PUC2 has a special zero latency monitoring (ZLM) feature which allows to
simultaneously monitor its input signal on all of its outputs. ZLM bypasses the
USB conversion and computer, offering very low input to output times, typically
less than 5ms, even at low sample rates. ZLM can be turned on by closing the
tip sand 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
overridden by connecting the ring and sleeve (ground) contact on the ZLM
switch jack, or by using a mono 3.5mm jack (or dummy plug) to switch on ZLM
mode.
Note that in case of PUC2 Mic LEA the meaning is different.
TIP
switch TIP
switch RING
GND
RING
Switch Tip (ZLM)
closed
closed
Switch Ring
closed
closed
Audio signal all PUC2
models except from
PUC2 Mic LEA
Computer audio output
from USB at -6dB and
input at -6dB mixed
Computer audio output
from USB at 0dB and
input at 0dB mixed
Computer audio output
from USB only
Computer audio output
from USB only
Audio signal
PUC2 Mic LEA
Tip closed
ZLM ON for Ch.1
Tip closed, Ring closed
ZLM ON for Ch.1 + Ch.2
Ring closed
ZLM ON for Ch.2
Tip + Ring open
ZLM OFF
