Classe Audio Delta PRE Owner's Manual page 13

NOTE: The Balanced (XLR) Output pin assignments adhere to
the AES (Audio Engineering Society) "Pin 2 = hot" standard. The
XLR male outputs carry the following pin assignments:
Refer to the operating manuals of your balanced-input power
amplifiers to verify that the pin assignments of their input
connectors adhere to this standard (Classé power amplifiers are
compliant). If your amplifiers are not compliant, it may not pose a
problem, but ask your Classé dealer for assistance.
13 Ethernet Connector
The Ethernet connection is used to enable streaming of audio using Apple's
AirPlay or DLNA. This connection also supports IP control for using the
Classé App with Android and iOS devices and/or a home automation
system to control the Delta PRE via your home Network.
14 Phono Input
The Delta PRE supports 1pr of RCA type connectors labeled Phono
R/L dedicated to a phono input and supporting high output MM and
both high and low output MC type phono cartridges. For instructions
on setting gain and loading for MM/MC type phono cartridges, see the
section on Phono Setup.
Two RCA shorting pins are included in the Accessories pack. These
should be inserted into the "Phono" inputs if they are not being used.
They prevent any noise from being conducted through these inputs and
amplified by the high gain circuitry, potentially coupling with other audio
signals in the preamp.
15 Main Power On/Off Switch
This switch connects and disconnects the Delta PRE from AC.
16 AC Power Cord Input (AC IN)
The detachable three-conductor AC power cord and the socket into
which it connects conform to rigorous standards developed by the IEC
(International Electrotechnical Commission).
Danger!
Your Delta PRE contains potentially dangerous voltages and
current capabilities. Do not attempt to open it! There are no
user-serviceable parts inside. All service must be referred to a
qualified authorized Classé dealer or distributor.
17 HDMI Inputs / Output (Optional)
An optional 4K-capable HDMI module is available for the Delta PRE.
It adds 4 HDMI inputs and 1 HDMI output to the unit. Please contact
your Classe Dealer for more information and to purchase this module.
18 Phono Ground Lug
Use this lug for grounding your turntable as necessary.
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
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