Manual-3
REAR PANEL DESCRIPTION
¼" TRS INPUT jack:
A differentially active balanced, auto unbalanced ¼" Input connector; tip = positive, ring = negative,
and sleeve = chassis ground. For unbalanced operation, use a 2 conductor (mono) plug; connect the tip to the signal line and
the sleeve to ground. If a 3 conductor plug is used for unbalanced operation, be sure to ground the ring. This Input parallels
the XLR connector and may be used for daisy chaining purposes,
but may not be used to sum two different Inputs.
XLR INPUT jack:
This Input parallels the ¼" connector and is wired: pin 1 chassis ground (shield, screen, etc.), pin 2
positive, and pin 3 negative. For unbalanced applications, be sure to use pin 2 as hot and
ground pin 3
. Making this connec-
tion engages the auto unbalanced Input mode. As above, you may use this connector for daisy chaining to drive other
equipment, but it
must not be used for summing purposes
.
¼" TRS OUTPUT jack:
This is an active balanced Output. The tip is signal positive, the ring is signal negative and the
sleeve is chassis ground. This jack parallels the XLR Output connector and may be used simultaneously to give two Outputs.
For unbalanced applications, the preferred choice is to use a TRS (tip-ring-sleeve) plug and leave the ring open; however, a
standard TS (mono) plug may be substituted without damage.
XLR OUTPUT jack:
This Output parallels the above. Wiring is per IEC/ANSI/AES standards: pin 1 ground, pin 2 posi-
tive, and pin 3 negative.
Remote POWER supply input:
This unit is supplied from the factory with a Model RS 1 Remote AC Power Supply
suitable for connection to this jack. This unit requires an 18 volt AC center-tapped transformer only.
This is not a telephone
jack. Never use a power supply other than the one supplied or a Rane approved replacement.
Chassis ground point:
A #6-32 screw is used for chassis grounding purposes. See below for details.
CHASSIS GROUNDING
If after hooking up your system it exhibits excessive hum or buzzing, there is an incompatibility in the grounding
configuration between units somewhere. Your mission, should you accept it, is to discover how your particular system
wants to be grounded. Here are some things to try:
1. Try combinations of lifting grounds on units that are supplied with ground lift switches or links.
2. If your equipment is in a rack, verify that all chassis are tied to a good earth ground, either through the line cord
grounding pin or the rack screws to another grounded chassis.
3. Units with outboard power supplies do NOT ground the chassis through the line cord. Make sure that these units are
grounded either to another chassis which is earth grounded, or directly to the grounding screw on an AC outlet cover by
means of a wire connected to a screw on the chassis with a star washer to guarantee proper contact.
Please refer to RaneNote 110, “Sound System Interconnection” elsewhere in this manual for further information on
system grounding.
