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Rear panel
Disconnect all associated equipment from the AC mains BEFORE
making any signal connections and applying power to the Nº38.
Note: All left-channel inputs and outputs are on the left of the rear
panel
as seen from the front
, and all right-channel inputs and outputs
are on the right of the rear panel
as seen from the front
. This design
minimizes any possible confusion when changing connections once
the unit is installed, while maximizing channel separation in this dual
monaural preamplifier.
1 BALANCED MAIN OUTPUTS
If your power amplifier is equipped with balanced (sometimes
called “differential”) inputs, it is best to use these balanced outputs
on your Nº38. A balanced signal from preamplifier to power
amplifier will offer the highest possible performance with the best
immunity from common-mode noise, such as radio frequency
interference (RFI). The balanced output signal is made available
by way of precision male XLR connectors (requiring female XLRs on
the preamplifier end of the interconnecting cable).
The pin assignments of these XLR-type male outputs are:
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Refer to your power amplifier’s operating manual to verify that the
pin assignments of its input connectors correspond to the Nº38. If
not, wire the cable so that the appropriate output pin connects to
the equivalent input pin.
Connect the right-channel and left-channel Balanced Main
outputs of the Nº38 to the appropriate balanced inputs of the
power amplifier.
PUSH PUSH PUSH PUSH
right balanced
main out
right balanced
input 1
right balanced
input 2
left balanced
main out
left balanced
input 2
left balanced
input 1
right main out left main out
right
input 3
right
input 4
right
input 5
right
input 6
left
input 6
left
input 5
left
input 4
left
input 3
right
rec out 1
right
rec out 2
left
rec out 2
left
rec out 1
slave external master
communication ports
PREAMPLIFIER Nº38
designed and manufactured in U.S.A.
by
MADRIGAL S/N
2
1
2
5
7
1 3 4 4
7
6
6 3
PRECAUTION
12
3