Owner's manual

Manual-3
REAR PANEL DESCRIPTION
 MIC/LINE INPUT jacks 1-4. These XLRs connect either balanced Microphone or Line signals, depending on the LINE
switch setting (see ). Rane adheres to the international and U.S. standard for balanced pin configurations: Pin 1 is chassis
ground (neutral), pin 2 is positive, and pin 3 is negative.
 PHANTOM POWER switch applies 15-volt phantom power to any Inputs 1-4 that are set for MIC input.
 LINE Input selectors switch the sensitivity and input impedance for either a microphone or line level input. If LINE is
chosen, Phantom Power is deactivated for that Input.
 ¼" LINE INPUT jacks. These stereo pairs of balanced inputs accommodate stereo line-level signals. These TRS (Tip-
Ring-Sleeve) ¼" jacks handle either balanced or unbalanced signals. In most cases an unbalanced signal may use a mono ¼"
plug (Tip-Sleeve). See the Sound System Interconnection RaneNote included with this manual for proper connection .
 A and B OUTPUT jacks. These XLR’s provide the A and B mixed output. INTERNAL OUTPUT LEVEL switches allow
setting the output level for MIC or LINE level. Pin connections are the same as above in .
 POWER supply input. This is not a telephone jack. The MLM 82a is supplied from the factory with an RS 1 remote
power supply suitable for connection to this input jack. The power requirements call for an 18 volt AC center-tapped
transformer only. Call the Rane factory for RS 1 replacement or substitution.
 Chassis ground point. A #6-32 screw is provided for chassis grounding purposes. See the note below for details.
CHASSIS GROUNDING
The MLM 82a is supplied with an external power supply (the RS 1). This power supply does not ground the unit. On
the rear chassis a 6-32 screw is provided to allow for attachment of the grounding wire. This chassis ground point must be
connected to earth ground either through another product which utilizes a three-prong grounded AC power cord or by
attaching the wire to a known earth ground, (the screw on a grounded AC outlet.)
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 ground-
ing pin or the rack screws to another grounded chassis.
3. Try moving the device away from high magnetic field sources, such as large transformers used in power amplifiers.
Please refer to the RaneNote “Sound System Interconection” for further information on system grounding.