Madrigal Audio 23.5, Manual, Page: 3 / 16

3
Signal connections
The Nº23.5 incorporates RCA-type and XLR-type connectors for audio
signal input.
The Madrigal-designed RCA-type connectors used for single-ended
audio interconnection are a great improvement over ordinary RCA-
type connectors. The gold-plated XLR-type connectors employed are
of European design, and are made to professional application
standards.
When connecting the Nº23.5 to a preamplifier, we recommend
Madrigal Audio Laboratories HPC Interconnect Cable. HPC
Interconnect Cable is available in various lengths, pre-terminated with
RCA, XLR, and Camac connectors. See your Mark Levinson dealer.
The Nº23.5 can be operated in either single-ended or balanced
mode. In each of these modes, the Nº23.5 can be operated either
normally (non-inverting) or inverting.
Note: This manual describes the connections for single-ended
normal (non-inverting), single-ended inverting, and balanced
normal (non-inverting) operation. If you have questions about
these or other methods of signal connection, see your Mark
Levinson dealer.
Typical audio systems require that the amplifier be of the non-inverting
type. This means that the output signal of the amplifier will be in phase
with the input signal.
For this type of operation, connect the main outputs of your
preamplifier to the left- and right-channel RCA-type inputs (non-
inverting) on the rear panel of the Nº23.5. Be sure that the shorting
strap is inserted into the XLR-type connectors between Pins 1 and 3.
Connectors
Cables
Connection methods and
operating modes
Single-ended normal
(non-inverting) operation
PUSH PUSH
+ –
Nº23.5
– + – +
Left
Loudspeaker
+ –
Right
Loudspeaker
From preamplifier main output
Shorting strap
Right
channel Left
channel
Figure 2: Connections for
single-ended normal
(non-inverting) operation