ATI Audio DMA103 - Manual (Page 4)

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GROUNDING
Operation in high RF broadcast environments requires special attention to
grounding and shielding. The chassis must be grounded directly to a good, low
impedance studio ground system. Input and output connections must be properly
shielded and free of ground loops. It may even be necessary to add shielding to
the DC input leads to avoid RF pickup.
POWER DISTRIBUTION
Multiple NANOAMPS sharing a single wall-wart power supply should be looped
through each other using the DC interconnects cables P/N 20602-1. Hum and
noise performance of the units can be degraded by poor DC ground connections
between units sharing a common supply. Use of the recommended rack and
desk mounting kits will assure a good ground connection between units by firmly
strapping their chassis together. CAUTION! The outer shell of the DC
interconnect cables is positive relative to the chassis. Do not allow a DC cable
plugged into a powered unit to hang loose where it can short against the chassis
or rack frame.
SETUP
Before mounting your product in a rack, remove the top cover (4 upper side
screws) and set the DA103 preamp gain jumper to match the nominal input line
level. For for the DMA103, set the preamp gain with the DIP rocker switch to the
highest level that does not cause input circuit clipping. Higher output mics will
require lower gains (20-30dB) while low output mics will require higher gain
settings (40-60dB). Also set phantom power ON or OFF as needed and select
line (+4dBm) or mic level (-50dBm) outputs with jumper plugs P1, P2 or P3.
MOUNTING
NANOAMP units may be rack mounted one, two, or three across in a standard
EIA 19" rack and will require only 1-3/4" of vertical space. Rack mount kit P/N
21075-501 mounts one, two or three units. When rack mounting fewer than three
units, you may wish to tidy up your installation with our 1/3 RU Filler Panels, P/N
21097-501.
Single desk mounting kits consist of a pair of angled base plates that mount
under the lower front and rear cover screws of a single unit to raise and to tilt it
for easy use. In addition, one or more sets of vertical stacking plates, mounting to
the upper front and rear cover screws of the bottom unit, allow multiple units to
be stacked. Several units can be desk mounted side-by-side and even stacked
side-by-side using horizontal joiner kits together with mounting base and stacker
kits. P/N 20617-501 is the angled base kit. P/N 20617-502 is the base plus one
stacker kit (two high). P/N 20617-503 is the base plus two stackers (three high).
P/N 20617-504 is the 2-unit stacker kit by itself.