Rane CM 86 User Manual download pdf (Page 4)

(System Connection - continued from first page...)

the LINE IN is not used, it automatically grounds inter-

nally. This allows the MIC/LINE switch now to act like a

mic mute switch since selecting LINE sees a grounded

input.

The input channel INSERT LOOP allows any external

processor to be tied in series with the input source before

the MASTER and AUX Level controls. It is wired per the

tip = send/ring = return convention.

A pair of RCA input jacks allow hook-up of a Tape

Player, Tuner or CD Player. Use the MONO switch to

combine the stereo inputs as required.

OUTPUTS. High-current cross-coupled amplifers drive

each of the four main outputs. The MASTER 1 OUTS

leave through terminal strips while the MASTER 2 OUTS

exit through 3-pin connectors wired per above. Use stan-

dard balanced wiring procedures of NOT connecting

ground between units, and grounding the shield only at

ONE end. If for some unforgiveable reason you run unbal-

anced, then you MUST short pin 3, or the “–” terminal to

pin 1 or ground. Cross-coupled output stages demand

GROUNDING of the unused output when operated unbal-

anced. The AUX OUT/IN jacks serve two functions: 1) As

Auxiliary Outputs use normal mono (l-wire) unbalanced

1/4" cable and connectors; 2) For effect box use, use stereo

(2-wire) 1/4" TRS interconnecting cable and connectors

wired per the standard insert loop convention of

tip= send/ring= return. Since the AUX OUTS are unbal-

anced, they CANNOT be used to drive long (greater than

100 feet or 30.5 meters) lines. The unbalanced TAPE OUT

RCA jacks should be treated similarly, i.e., restrict their

OPERATING INSTRUCTIONS

SETTING MIC GAIN CONTROL. Use the exact micro-

phone for each input and approximate expected normal pro-

gram levels and content. Observe the OL (Overload)

indicator (above and to the right) as you increase the MIC

GAIN control. The proper setting is when the OL light oc-

assionally flickers with program material, but does not

come on steady for long periods of time. The best signal-to-

noise performance results from taking as much gain as pos-

sible at this stage. The OL indicator located at the top front

of each input channel is a duplicate of the one in the rear.

If an input sounds distorted, check these lights and turn

down the MIC GAIN as necessary.

USING THE MIC/LINE SWITCH. Choosing between

the MIC and LINE inputs is done with this slide switch.

The LINE input is a bonafide separate input (not a pad in-

serted in the MIC input), which allows both inputs to be ac-

tive and selected at any time. Additionally, the LINE input

is automatically grounded when NOT in use, which lets

this switch then act as a MIC MUTE.

The CM 86 is supplied with a rear mounted LIFT

(ground-lift) switch. The unit is shipped with this switch

in the “grounded” position, tying circuit ground to chas-

sis ground. If after hooking up your system it exhibits

excessive hum or buzzing, there is an incompatibility in

the grounding configuration. Your unholy task is to dis-

cover how this particular system wants to be grounded.

Here are some things to try:

1. Try combinations of lifting grounds on units sup-

plied 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 pins or through the rack screws via an-

other grounded chassis.

3. Units with outboard power supplies do NOT ground

their 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 the

CHASSIS GROUNDING SCREW.

CHASSIS GROUNDING

IMPORTANT NOTE

Please refer to Rane Note 110 (supplied with your unit

and available on request at no charge if you lost your

first one) for further information on system grounding.

FLEX BUS. The Flex Bus allows you to expand the CM

86 using either another CM 86 or any of the Flex bus mod-

ules. The bus carries four signal lines (Master A & B and

Aux A & B) and two spare. The signal lines come into the

CM 86 via the FLEX BUS IN connector, sum with all

local inputs and exit via the FLEX BUS OUT connector.

This mixing is done before the Master Insert Loops. Signal

comes straight in, mixes into the four summing buses and

goes straight out. The two spare lines simply tie the bus

connectors together. See the FLEX USERS GUIDE for ad-

ditional details.

FOUR INDEPENDENT OUTPUT MIXES. The CM 86

allows you to create up to four independent output mixes:

MASTER A, MASTER B, AUX A and AUX B. For true

independence of the AUX mixes, remember to position the

assign switches to the PRE position, otherwise changing

input LEVEL controls also affects AUX levels.

Observe that MASTER OUT 1 and MASTER OUT 2 are

the same mix, but may be set for different levels.

All features & specifications subject to change without notice. 520-230 892

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Rane CM 86 User Manual Page 4

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