Toa MX-401 - Input Connections and Specifications

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 MX-401
is provided with an Input Level Control that includes a negative feedback (NF)
circuitry, so the usable signal level range is wide. Input impedances and levels are
shown in the following table.
INPUT SPECIFICATIONS
*Sensitivity is the level required to produce a program out level of +4dB.
*0dB is referenced to 0.775V RMS.
All XLR Type connectors are electronic balanced. 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 MX-401 are wired as follows: Pin 1 is ground (shield). Pin 2 is cold (low, minus).
Pin 3 is hot (high, plus).
— 6 —
CONNECTION
CH1
CH4
AUX
GEQ
PWR/AMP
INPUT
LOW Z
HIGH Z
ACTUAL
LOAD
IMPEDANCE
OPEN
27k
30k
50k
10k
FOR USE
WITH
NOMINAL
50 TO 250
MICRO-
PHONES
27k
OR
LOWER IMP
LINES
30k
OR
LOWER IMP,
LINES
50k
OR
LOWER IMP,
LINES
10k OR
LOWER IMP,
LINES
SENSITIVITY*
(PGM OUTPUT
LEVEL +4dB)
-60dB (0.78mV)
-35dB (13.8mV)
-20dB (77.5mV)
+4dB (1.23V)
+4dB (1.23V)
CONNECTOR
XLR TYPE NC3F
PHONE JACK
RCA PIN JACK
PHONE JACK
PHONE JACK
PHONE JACK
Input Connections
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