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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
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1
2
5
7
1 3 4 4
7
6
6 3
PREAMPLIFIER Nº380
Rear Panel
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 also maximizing
channel separation in this dual monaural preamplifier.
1 BALANCED MAIN OUTPUTS
If your power amplifier is equipped with balanced (sometimes called “dif-
ferential”) inputs, it is best to use these balanced outputs on your Nº380. 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:
12
3
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 as-
signments of its input connectors correspond to the Nº380. 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
Nº380 to the appropriate balanced inputs of the power amplifier.