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
RX-31C 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.
CONNEC-
TION
INPUT
(1-8)
AUX
INPUT
SELECTOR
MIC
LINE
ACTUAL LOAD
IMPEDANCE
FOR USE WITH
NOMINAL
50 TO 250
MICROPHONES
OR
LINES
OR LOWER
IMP. LINES
OR LOWER
IMP. LINES
TRIM
POSITION
0
-30
0
-30
SENSITIVITY
(AT MAX GAIN)
—84dBm (0.049mV)
—54dBm (1.55mV)
—44dBm (4.9mV)
—14dBm (155mV)
—40dBm (7.75mV)
INPUT LEVEL
NOMINAL
—64dBm (0.49mV)
—34dBm (15.5mV)
—24dBm (49mV)
+ 6dBm (1.55V)
—20dBm (77.5mV)
*MAX. BEFORE
CLIP
—35dBm(13.8mV)
—5dBm(436mV)
+ 5dBm (1.38V)
+ 35dBm (43.6V)
+ 9dBm (2.18V)
CONNECTOR
XLR TYPE
XLR-3-31
PHONE JACK
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 floating (balanced) and transformer isolated. 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 RX-31C are wired in accordance with NAB standards: Pin 1 is
ground (shield), Pin 2 is cold (low, minus), Pin 3 is hot (high, plus).
INPUT SPECIFICATIONS
– 6 –
Input Connections
All manuals and user guides at all-guides.com