User guide

Precision 8 OPERATION MANUAL
8
equipment that emits strong electromagnetic fields. If the unit is to be permanently
mounted in a high-vibration environment, you may wish to provide additional side or
rear support to prevent possible distortion of the mounting ears.
• Do not locate the unit where it is exposed to rain, moisture, or liquid spills.
• Do not locate the unit where it is exposed to temperature extremes.
• Do not mount the Power Supply Unit closer than one rack space from the
preamp unit. This avoids coupling unwanted magnetic interference into the
preamp unit.
Ventilation
We recommend that you provide adequate ventilation so that the air temperature
surrounding the unit does not exceed 55°C (122°F). If multiple units are to be mounted
in a poorly ventilated rack or travel case, a 1 3/4” blank space should be located after
every two units (two units mounted together, blank space, two more units, etc.).
OPERATION
Connections
AC Mains Connection: Prior to connecting the AC mains power cord to the
Precision 8, verify that the AC mains voltage in your area is nominally
120VAC, 60Hz. This insures that the Precision 8 will operate according to
specifications. To provide continued protection against fire, replacement
fuses should be only of the types listed on rear panel (T 315mA L, 250V). Product
damage caused by incorrect voltage settings or fuse selections cannot be covered
under warranty. For other operating voltage options, consult TRUE SystemsTRUE Systems.
Signal Ground Lift 1 Signal ground is isolated from earth ground in the LIFT position.
This switch will normally be in the grounded (down) position. See “Troubleshooting”
section for usage tips.
Output Cable Connection: For ease of connection, we’ve provided two styles of
balanced output connector: 8-channel DB25 and individual TRS 2 . Both output types
are electrically equivalent and may be used simultaneously to connect to Line Inputs on
mixing consoles, recorders, etc. If both pairs of outputs are used, care should be taken
to avoid system ground loops. See “Troubleshooting” section for tips on avoiding hum
caused by grounding problems.