Qualis Audio Sentine, User Manual, Page: 19 / 108

Installation 13
ical source impedance imbalance. A common mode filter is used to
improve RF immunity.
The high input impedance of the Sentinel makes unconnected inputs
sensitive to noise and AC fields. These can cause low-level bargraph
activity. Unused inputs should be shorted or resistively terminated with
a low value.
Connecting balanced inputs
Commercial breakout cables may be used to connect the Sentinel input
to XLR or ¼" phone jacks. Cables should follow the standard pin 2 high,
pin 3 low and pin 1 shield connection on the female XLR connectors.
These are available from a variety of vendors in a range of lengths:
Apogee-AD-8-IFC 1 m
Horizon DA88-*F 5, 15 ft
HOSA DTF-80* 3, 5 m
Mogami-DB25-XLRF- 5, 10, 15, 20, 25 ft
Monster SLDA88-FX-* 1.5, 3, 5 m
Planet Waves XLR-F 5, 10, 25 ft
Pro Co DA88XF* 5, 10, 15 ft
Quantum Audio QDA88-*F 6, 15, 20, 25 ft
Switchcraft DB25M*XLRF 2, 3, 5 ft
Specifications for fabricating custom cabling are provided in Analog
audio connections (p. 85).
Connecting unbalanced inputs
Commercial breakout cables are also available to connect the Sen-
tinel input to RCA connectors or other unbalanced sources. However,
take care to ensure the cable connects the low side of the input to the
source connector shield at the source itself. Otherwise the differential
input will be unable to attenuate hum induced by ground potential dif-
ferences between the source and the Sentinel.
Specifications for fabricating custom cabling are provided in Analog
audio connections (p. 85).