Viking MCX-106 Input Connections, Connect low impedance outputs to high impedance inputs

Input Connections

Generally speaking, there are two rules to follow when connecting equipment outputs

to the inputs of other equipment.

1.Properly match the impedances of the outputs and inputs.

2.Connect low impedance outputs to high impedance inputs.

It goes without saying that not only input and output impedance matching but also level matching should be taken into consideration. Each input channel of the MCX- 106 is provided with an input TRIM control, so the usable signal level range is very wide. Input impedances and levels are shown in the following table.

INPUT SPECIFICATIONS

		ACTUAL	FOR USE	TRIM	SENSITIVITY	MAX BEFORE
CONNECTION	INPUT	LOAD	WITH	POSI-	(PGM OUTPUT	CLIP INPUT	CONNECTOR
		IMPEDANCE	NOMINAL	TION	LEVEL +4dB)	LEVEL
	LOW Z	OPEN	MICRO-	10	-55dBm (1.38mV)	-34dBm (15mV)	XLR TYPE NC3F
CH1					-16dBm (123mV)
			PHONES	0		+1.7dB (0.94V)
CH6	HIGH Z		LOWER IMP	10	-35dBm (13.8mV)	-14dBm (150mV)	PHONE JACK
					+4dBm (1.23mV)
			LINES	0		+20dB (7.75V)
AUX (L & R)	——		LOWER IMP,		-l0dBm (245mV)	+8dBm (1.9V)	PHONE JACK
							RCA PIN JACK
			LINES
EFF/RET	——		LOWER IMP,		-20dBm (77.5mV)	-2dBm (0.61V)	PHONE JACK
			LINES
GEQ	——		LOWER IMP,		+4dBm (1.23V)		PHONE JACK
			LINES
PWR	——				+4dBm (1.23V)		PHONE JACK
BUSS LINK	——		LOWER IMP		+4dBm (1.23V)	+20 dBm (7.75V)	PHONE JACK
(PGM, FB, EFF)
			LINES

*Sensitivity is the level required to produce a program out level of +4dBm. *0dBm is referenced to 0.775V RMS.

All XLR Type connectors are electronically balanced (transformer less). Phone jack is

unbalanced.

If the line going from one piece of equipment to another is long (more than 5m), we

recommend that balanced outputs be connected to balanced inputs.

As is described in the beginning of the Operating Instructions Manual, the connectors

of the MCX-106 are wired as follows: Pin 1 is ground (shield). Pin 2 is cold (low,

minus). Pin 3 is hot (high, plus).

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