Classe Audio Delta PRE User manual

Owner’s Manual
Delta PRE
Stereo Preamp/Processor

2
Contents
Welcome to the Classé family..........................................................................4
Exceptional Design Features ............................................................................5
versatile connectivity.................................................................................5
superior performance ................................................................................5
clean, dedicated power .............................................................................5
room equalization and speaker control .....................................................5
flexible GUI...............................................................................................5
network connectivity and streaming audio................................................5
extraordinary longevity..............................................................................5
Unpacking and Placement...............................................................................6
unpacking your Delta PRE.........................................................................6
Delta PRE placement considerations .........................................................6
warm-up/break-in period...........................................................................7
operating voltage.......................................................................................7
Front Panel.......................................................................................................8
Rear Panel......................................................................................................10
serial number ......................................................................................... 10
The Remote Control.......................................................................................14
Initial Setup....................................................................................................16
Using the Delta PRE.......................................................................................19
Source Selection..................................................................................... 19
The Menu System ..........................................................................................20
System Setup..................................................................................................21
Source Setup .......................................................................................... 22
Enable Source .................................................................................. 22
Input Connector............................................................................... 22
Source Name ................................................................................... 22
Configuration................................................................................... 23
Input Offset...................................................................................... 23
Pass-Thru ......................................................................................... 23
Digital Bypass .................................................................................. 23
Phono Setup .......................................................................................... 24
Remote Fkeys ......................................................................................... 24
Volume Setup ......................................................................................... 25
Max Volume .................................................................................... 26
Startup Volume ................................................................................ 26
Mute Setup....................................................................................... 26
Configuration Setup............................................................................... 27
Configuration Name ........................................................................ 27
Configure Outputs ........................................................................... 27
Auxiliary Channels........................................................................... 28
Display Setup ......................................................................................... 28
Brightness ........................................................................................ 28
Timeout............................................................................................ 28
Network Setup........................................................................................ 29
EQ Setup ................................................................................................ 29
Tone Control Setup................................................................................. 30
DC Triggers............................................................................................. 30
Headphones X-Feed ............................................................................... 31
Advanced Settings .................................................................................. 31

3
Tone Control ..................................................................................................32
Balance..........................................................................................................32
Configurations................................................................................................32
Mono .............................................................................................................33
Status .............................................................................................................33
Firmware Updates..........................................................................................33
CAN-Bus........................................................................................................34
features ................................................................................................. 34
hardware setup ..................................................................................... 34
using CAN-Bus ....................................................................................... 34
CAN-Bus amp features .......................................................................... 35
operate ................................................................................................... 35
Mute....................................................................................................... 35
Global Standby....................................................................................... 35
Global Dim ............................................................................................ 35
Other Status............................................................................................ 36
Name ..................................................................................................... 36
Event Log................................................................................................ 36
Network Sources............................................................................................36
Apple AirPlay.................................................................................................37
DLNA.............................................................................................................38
Troubleshooting .............................................................................................39
network/streaming troubleshooting......................................................... 41
Care & Maintenace .......................................................................................42
Specifications.................................................................................................43
Dimensions....................................................................................................49
Installation Worksheet....................................................................................50

4
Welcome to the Classé family
Congratulations on your purchase of the Classé Delta PRE, a stereo preamp/
processor with reference-quality performance. It is the result of many years of
design experience, and we are sure that you will enjoy it for many years to come.
Classé values its relationships with our customers and intends on supplying the
highest level of support along with our product. Registering your product will
allow us to keep in touch and will ensure that you are notied regarding any
future updates or options which become available.
You can register online at https://classeaudio.com.
Please take a few moments now to register your new Classé
preamp/processor and record your serial number for future
reference.
Please note that your Classé warranty is valid only in the country of purchase;
for service in other countries please contact the local distributor. For details,
please consult the Warranty Card that comes with your unit
a word about installation Every eort has been made to make the Classé Delta PRE simple and
straightforward to install and use.
e size and shape of your room, its acoustics, and the associated equipment
you have chosen to use with your amplier all inuence the performance of your
system.
For this reason, we strongly encourage you to have your system
installed and calibrated by your dealer, whose experience,
training, and specialized equipment can make a profound
difference in the final performance of the system.

5
Exceptional Design Features
e Delta PRE is a stereo preamp/processor, designed for music lovers who
demand the ultimate in sonic performance from their audio system. Its
connectivity and processing power accommodate the ever increasing array of
music sources, allowing them to be accessed and enjoyed without compromise.
versatile connectivity e Delta PRE is a stereo preamp/processor with both balanced and single-
ended output connections. A comprehensive set of analog and digital inputs
and control interfaces enable compatibility with most contemporary audio
system equipment.
superior performance Advanced circuit topologies, component parts, and circuit layout techniques
combine for superior audio performance. e analog and digital signal paths
have been optimized to ensure superior performance from every source.
clean, dedicated power A highly rened linear power supply is used together with a newly developed
switch mode power supply to provide the clean, high-current power required for
best performance. Liberal use of local regulation provides clean, low impedance
access to power wherever and whenever needed.
room equalization
and speaker control All home audio systems are aected by room characteristics. Sound reections
and sound absorption can create dramatic variations in the performance of your
system, particularly in the lower frequencies. e Delta PRE features a system
of Parametric EQ lters which, in the hands of an experienced acoustician, can
help optimize the performance of your system.
Bass management allows one or two subwoofers to be added to augment
frequencies where the response from the Left and Right speakers may tend to
cancel each other. Together, these digital domain tools help deliver smooth and
accurate low frequency performance. Lastly, a sophisticated and exible digital
domain Tone/Tilt Control can be used to tweak the tonal balance of individual
recordings.
flexible GUI e front panel’s LCD touchscreen supports an extremely exible and
versatile graphical user interface (GUI) while maintaining a clean, uncluttered
appearance. e Delta PRE provides a range of controls that might otherwise
require dozens of buttons and knobs on the front panel. Despite this power and
exibility, it remains simple to operate in day-to-day use.
network connectivity
and streaming audio A rear panel Ethernet connection on the Delta PRE allows streaming audio
via Apple’s AirPlay and DLNA as well as full IP control via the Classé App
(available free of charge in the Apple App and Google Play stores) or home
automation systems.
extraordinary longevity Because Classé has developed highly rened circuits over many years, we have
vast experience in what works well over the long term. Using this knowledge
base, along with quantitative results derived from highly accelerated life testing
(H.A.L.T.), allows us to select only the most reliable parts. is attention to
detail and design allows us to manufacture products which stand the ultimate
test: time. Just as past Classé products have done for their owners, we are certain
that your new stereo preamp/processor will give you many years of continuous
enjoyment.

6
Unpacking and Placement
We have taken all precautions, and made every eort to make the Delta PRE
simple and straightforward to install and use. Still, we recommend that you
take a few minutes to review this manual. Even if you are having the preamp/
processor professionally installed, you will want to know how to eciently
operate it to its potential.
e Delta PRE menu system includes features that allow a great deal of ne-
tuning. Still, we have no way to evaluate outside variables such as the acoustical
characteristics of your listening space and the associated equipment of your
audio system. erefore, it is up to you to make the nal audio adjustments for
the optimum performance of your system.
unpacking your
Delta PRE
Carefully unpack the Delta PRE Stereo Preamp/Processor. Do not forget to
remove all accessories from the carton.
Important! Keep all packing materials. Transporting the Delta PRE without
using the packaging specifically designed for it may result in
damage that is not covered under the warranty.
Delta PRE placement
considerations Before installing your Delta PRE, be sure to read the following placement
suggestions.
• Do not place the Delta PRE directly on the top surface of a
conventional power amplier or any other heat source. Also keep the
unit out of direct sunlight.
• Place the Delta PRE so that the IR window on the front panel is
clearly visible and not blocked.
• Position
the Delta PRE in a central and convenient location for
both visibility and use. e preamp/processor is the hub for all other
component connections and generally your primary interaction point.
In addition, by placing the unit close to the other system components,
you minimize the cable lengths and hence reduce the amount of noise
that is introduced into the system through the cabling.
• Leave adequate clearance behind the Delta PRE for the AC cord and
connecting cables. We suggest six inches (15 cm) of free space to allow
cables sucient room to bend without crimping or undue strain
.
• Allow at least three inches (7.5 cm) of clearance above and to each
side of the Delta PRE for ventilation. Do not obstruct the area
around the unit so that excess heat can dissipate through normal air
circulation.
Important! Obey all placement considerations. Not obeying the
placement considerations may result in damage that is not
covered under the warranty.

7
warm-up/break-in period Your new Classé preamp/processor delivers outstanding performance
immediately. However, you can expect to hear subtle improvements as it reaches
normal operating temperatures and breaks-in.
In our experience, you can expect the greatest changes within the rst 72 hours.
After initial break-in, you’ll enjoy consistent performance levels for years to
come.
operating voltage e operating voltage of your Delta PRE is specied on the rear panel label that
also includes its serial number. .
Important! Attempting to operate your Delta PRE from an incorrect AC
voltage source may cause irreparable damage which may not
be covered by your warranty.
If you are not planning to use the preamp/processor for an extended period of
time, for example due to vacation or other travel, we suggest that you disconnect
it from AC power.
Make certain that the Delta PRE is in Standby prior to disconnecting it.
Physically disconnect any and all valuable electronics from AC power during
electrical storms. A lightning strike anywhere near your home can generate a
tremendous surge on the AC mains that can jump across a simple power switch.
A surge from a lightning strike, which may be many thousands of volts, can
cause serious damage to any piece of electronics, no matter how well designed
and protected.

8
Front Panel
e front panel of the Delta PRE is shown above. e numbers in the drawing
refer to the descriptions that follow.
1 Standby/On Button and Status Indicator LED
Pressing the Standby button puts the Delta PRE into standby mode – a
low-power state which leaves the preamp/processor and outputs inactive
but still allows the unit to respond to system commands via any of the
supported control protocols (IR input, LAN, CAN-Bus or RS-232)*.
If the unit is already in Standby mode, pressing the Standby button fully
powers up the unit.
• LED On (Red) – the Delta PRE is in Standby mode.
• LED turns green, then white – the Delta PRE is in the process of
power-up initialization.
• LED On (white), indicates the unit is in the operate mode.
• LED Flashing (blue), indicates the unit is updating rmware.
• LED Flashing (red), indicates a problem during startup.
•
LED O – the Delta PRE is not getting AC power.
*See section on Advanced Settings: Wake-on-Network must be enabled
to allow controllers to wake the unit from Standby.
2 Touchscreen
e front panel touchscreen is used for day-to-day operation of the Delta
PRE. It is also used for setup and to display useful information as required.
Touch the screen anywhere on this Home page to access sources.
3 Menu On/Off Button
Press once to call up the main page of the menu system. Press the Menu
button again to revert to the Home page.
e menu system gives you control over operational details including:
system setup options, various display options and custom installation
capabilities so that the Delta PRE integrates smoothly into the most
complex systems. For more information, see the Menu System later in this
manual.
Delta PRE
Delta PRE
1 62 3 4 5 7

9
4 IR Window
e location of the IR (infrared) receiver for the remote control is behind
this window. In most cases, there must be a clear path between the IR
window and the remote control in order for the Delta PRE to acknowledge
the remote control commands.
If the IR window is not in view, for example if the unit is placed in a
cabinet or closet, then the rear panel IR input can be utilized for remote
control. For more details about this option, see the IR input description in
the Rear Panel section found later in this manual.
5 USB Host Connector
e front panel USB connector allows the Delta PRE to work with
Apple’s portable media devices such as iPad™, iPod® and iPhone® which
require this type of connection. e front panel USB connector accepts
digital audio from these devices (up to 96 kHz) and provides power for
recharging them. Limited control is also available for these devices using
the navigation keys on the Delta PRE remote control.
e front panel USB connector is also used to load rmware updates.
When updates are posted in the software downloads section of the Classé
web site, they may be loaded onto a USB stick and plugged into the front
panel of the Delta PRE. More information on this can be found in the
Firmware Updates section of this manual.
6 Headphone Jack
e 1/4”(6.35mm) Headphone Jack accommodates stereo headphones.
Inserting a headphone plug mutes the main audio outputs.
7 Volume Control Knob
e large rotary knob on the right side of the front panel controls the
system volume level. It is also used for adjustments such as balance, input
oset and levels for the EQ and Tone Control.
The volume knob increases and decreases volume in precise 0.25 dB
increments throughout most of the volume range. At extremely low
volume, the step size is increased somewhat to facilitate moving between
extremely low and normal listening levels. e volume range is from
-93.00 dB to +14.00 dB.
e volume control expresses the degree of attenuation or amplication
being applied to the incoming signal. erefore, a setting of -23.00
indicates that the signal is being attenuated by 23.00 dB.
Most stepped attenuators oer too few steps, causing the listener to
choose a level that is a bit too soft or too loud, not just right. e volume
display on the touchscreen reads in 0.25 dB increments , thereby closely
approximating a continuous volume control, allowing the desired level to
be selected precisely as required for critical listening.
A volume setting of 0.00 indicates that no attenuation or amplication is
being applied. is is the setting used for the Pass-ru mode explained in
the Source Setup description in the Menu System section of this manual.

10
Rear Panel
e rear panel of the Delta PRE is shown above. e numbers in the drawing
refer to the descriptions in this section.
serial number You’ll nd your Delta PRE serial number on the rear panel, next to the AC Inlet.
Please record this number for future reference.
And since you have found the serial number, please use it to register your
purchase, if you haven’t done so yet. We may use the information to advise you
of any updates or other items of interest. Registration is simple, so please register
online at https://classeaudio.com.
1 Digital Audio Input - USB
e Delta PRE supports PCM digital audio sources up to 32-bit/384kHz
and DSD at native rates up to 256 (requires esycon/Classé driver for
Windows) and as DoP (DSD over PCM) at rates up to 128 via USB. e
rear panel USB Device connector mates with a USB Host such as a PC or
Mac.
Volume control changes made on your USB source will adjust volume in the
analog domain in the Delta PRE, which oers the highest performance. e
alternative, which is to adjust volume in the digital domain, causes loss of
resolution. Attentuation in the digital domain involves using fewer bits, so we
avoid it wherever possible
2 Digital Audio Input - AES/EBU
e Delta PRE provides an XLR type connector for digital audio
connections from source components such as CD players tted with this
professional-standard output. ese inputs accept PCM data streams up to
32-bits long and up to 192 kHz sampling frequency. We recommend using
cables that are optimized for digital audio signal transfer and that carry a
110Ω impedance rating. Your Classé dealer can help you with proper cable
selections.
3 Digital Audio Inputs - Coaxial
e Delta PRE supports three digital audio inputs, with SPDIF connectors
labeled COAX1 to COAX3. ese inputs accept PCM data streams up to
32-bits long and up to 192 kHz sampling frequency. We recommend using
cables that are optimized for digital audio signal transfer and that carry a
AUX 1
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.
OPERATION IS SUBJECT TOTHE FOLLOWING TWO CONDITIONS:
(1) THIS DEVICE MAY NOT CAUSE HARMFULINTERFERENCE, AND
(2) THIS DEVICE MUST ACCEPTANY INTERFERENCE RECEIVED,
INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION.
OPT1
AES/EBU
OPT2 OPT3
ETHERNETUSB
IR
CAN BUS
RS-232
ANALOG AUDIO IN
PHONO
L4R4 LRL3R3
L2R2L1R1
COAX1 COAX2 COAX3
OUT
IN
2
1
DELTA PRE
CAUTION! TO REDUCE THE RISK OF ELECTRIC SHOCK, GROUNDING
OF THE CENTRE PIN OF THIS PLUG MUST BE MAINTAINED
ATTENTION! POUR RÉDUIRE LE RISQUE DE CHOC ÉLECTRIQUE
LA FICHE CENTRALE DE LA PRISE DOITÊTRE
BRANCHÉE POUR MAINTENIR LA MISE À LATERRE
MAIN L
MAIN RAUX 2
ANALOG AUDIO OUT
SUB
TRIGGER
GND
DIGITAL IN
100-120~ T2AE 250V
220-240~ T1.25AH 250V
Conforms to ANSI/UL Std.60065
Cert. to CAN/CSA Std. C22.2 No.60065
1512 16 1 13 2 3 4
6 14
5
10 11 97 8
17 18

11
75Ω impedance rating. Your Classé dealer can help you with proper cable
selections.
4 Digital Audio Inputs - Optical
e Delta PRE supports three digital audio inputs, with optical TOSlinkTM
connectors labeled OPT1 to OPT3. ese inputs accept PCM data
streams up to 32-bits long and up to 192 kHz sampling frequency*. We
recommend using cables that are optimized for digital audio signal transfer.
Your Classé dealer can help you with proper cable selections.
*NOTE: e bandwidth limits of TOSlink™ components are very
much strained at a 192 kHz sampling frequency. For that reason
you may want to limit signals using the TOSlink™ connections to a
maximum rate of 96 kHz.
5 Analog Audio Inputs - Single-Ended
e Delta PRE supports 2pr of RCA type connectors for single-ended line-
level analog sources. ey are labeled R3/L3 and R4/L4.
6 Analog Audio Inputs - Balanced
e Delta PRE supports 2pr of XLR type connectors for balanced analog
sources. ey are labeled R1/L1 and R2/L2.
NOTE: is input conforms to the AES (Audio Engineering
Society) “pin 2 = hot” convention. e pin assignments of these
XLR-type female output connectors are:
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Verify that the source components are compliant with this
convention (Classé components are compliant). If not compliant,
contact your Classé dealer for assistance.
e XLR R2/L2 connectors may be assigned as a phono input. See the
section on Phono Setup.
NOTE: e Balanced and Single-Ended 2-channel analog
audio inputs can be set for either digital bypass mode (all DSP
processing switched o) or converted to digital format to allow bass
management, tone control and/or equalization. If no processing is
applied, analog signals remain in the analog domain, even if not
specically set to digital bypass.
7 IR Input
Use the IR input when the front panel IR window does not have a clear
line-of-sight with the remote control, for instance, when the Delta PRE is
installed in a cabinet. Attach this input to an infrared repeater system to
route signals from the remote control to the Delta PRE via a mono mini-
jack (3.5mm phono).

12
e list of available IR command codes can also be used in macros for
sophisticated remote control systems, facilitating the control of the
Delta PRE in the larger context of the complete system.
8 IR Output
Use the IR output to pass IR commands from an external IR transmitter
through the Delta PRE to another component, when necessary. e
output uses a mono mini-jack (3.5mm phono) with the same properties as
the diagram in the previous section.
9 Trigger Outputs
e Delta PRE supports two trigger outputs, with mono mini-jacks
(3.5mm phono) labeled OUT1 and OUT2. Each trigger outputs a 12V
DC signal at 100 mA and each can be controlled individually. Use these
outputs to control other system components such as ampliers and
window blinds. Refer to the DC Triggers description in the Menu System
section for more details.
10 RS-232 Port
e primary purpose of the RS-232 port is to support the use of external
commands to allow remote control of the Delta PRE by such systems as
AMX®, Control 4, CrestonTM and Savant®. For more information about
these systems, contact your Classé dealer.
11 CAN-Bus Input and Output
CAN-Bus (Controller Area Network) allows several Classé components to
be connected together for simultaneous operation, such as switching from
On to Standby. Using the CAN-Bus Input and Output connectors, the
Classé components can be daisy chained together and controlled via the
CAN-Bus interface.
NOTE: e nal component in the daisy chain MUST have a
termination plug inserted into the CAN-Bus output.
For more information, refer to the CAN-Bus section found later in this
manual.
12 Analog Outputs
e Delta PRE supports ve analog audio outputs, with both balanced
(XLR) and single-ended (RCA) connections. Connect the Main R and
Main L outputs to the Right and Left amplier channels respectively.
e Aux 1 and 2 outputs are congurable and can be used for the
following purposes:
• Assigned to mirror the main L/R speakers for use in a power
biamplication arrangement.
• AUX 1 may be assigned as an additional subwoofer to be used in
conjunction with the Sub output congured as either two stereo
or two mono subs. See Conguration Setup/Auxiliary Channels
for more details.

13
NOTE: e Balanced (XLR) Output pin assignments adhere to
the AES (Audio Engineering Society) “Pin 2 = hot” standard. e
XLR male outputs carry the following pin assignments:
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Refer to the operating manuals of your balanced-input power
ampliers to verify that the pin assignments of their input
connectors adhere to this standard (Classé power ampliers are
compliant). If your ampliers are not compliant, it may not pose a
problem, but ask your Classé dealer for assistance.
13 Ethernet Connector
e Ethernet connection is used to enable streaming of audio using Apple’s
AirPlay or DLNA. is 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
e 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. ese
should be inserted into the “Phono” inputs if they are not being used.
ey prevent any noise from being conducted through these inputs and
amplied by the high gain circuitry, potentially coupling with other audio
signals in the preamp.
15 Main Power On/Off Switch
is switch connects and disconnects the Delta PRE from AC.
16 AC Power Cord Input (AC IN)
e 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.

14
The Remote Control
Your Delta PRE Stereo Preamp/Processor includes a versatile IR remote control
for both the Preamp/Processor itself and several aspects of the rest of a Classé-
based system. e buttons are arranged in logical groups according to their
functions. e remote control of the Delta PRE is shown on the left. e
numbers in the drawing refer to the descriptions that follow.
1 Basic Functions
e two buttons at the top of the remote control groups the following
basic control functions:
• Light turns on the backlighting of the remote control for better
visibility under low-light conditions. After a few moments of
inactivity, the backlight switches o automatically.
• Standby toggles the Delta PRE between the Standby and Operate
states.
2 Volume Control & Mute Buttons
e Volume Up and Down arrow buttons increase or reduce the overall
volume level of the audio output. Pressing the Mute button reduces the
audio output volume level by a pre-determined amount. You can customize
selected features of both the Mute button and volume level. Refer to the
Volume Setup description in the Menu System section found later in the
manual for further instructions.
3 Config Select Buttons
e left and right arrow buttons step through the six congurations. If
there is a dierent conguration assigned as a default for a particular source
it will be overridden until the source is selected again, or you select that
particular default conguration.
Pressing the CONFIG SELECT button will open the congurations page,
making it easier to navigate to a specic conguration. Use the positions
of the highlighted buttons on the screen rather than trying to read their
names from across the room.
4 Source Select Buttons
To change inputs, simply use the Source Select arrow buttons to step
through the inputs.
Pressing the SOURCE SELECT button will open the Source Selection
page, making it easier to navigate to a specic source. Use the positions
of the highlighted buttons on the screen rather than trying to read their
names from across the room.
To keep your input selection list smaller and easier to navigate, the Source
Select buttons will toggle only through those sources which are enabled.
Refer to the Menu System section found later in the manual for further
instructions.

15
5 Navigation & Menu Buttons
e remote control contains the navigation buttons and the menu access
buttons. is array of buttons is used for navigating the menu system on
the Delta PRE as well as providing basic transport controls to USB and
AirPlay-connected sources. Each of the buttons performs the following
function(s):
• MENU accesses the main screen for the menu system, in the
same fashion as the front panel Menu button.
• HOME returns the touchscreen display to the Home page. e
HOME button essentially acts like a “back to start” button – no
matter how deeply you’ve navigated into the menu system, a
single button push returns you to the front page.
• Navigation Arrows are located in the familiar Up (p), Down
(q), Left (t), and Right (u) arrow positions which allow
you to select the dierent menu options within the menu
system. When on the Home page, these buttons instead serve as
transport controls for USB and AirPlay sources with the typical
play/pause, stop, scan/skip forward and scan/skip backward
commands.
• Pressing the ENTER button selects the underlined menu item in
any menu screen.
• TONE accesses the Tone Control screen. Pressing Tone while on
the Tone Control screen activates the tone control. Subsequent
presses toggle between enable and not enable. While on the
Tone Control screen, the volume up/down keys adjust the tone
control. See Tone Control Setup in the Menu System section for
more information.
• BAL is used to access the Left/Right balance. Use the Volume
arrows to adjust the L/R balance.
6 Function Keys (F1 to F8)
e last eight buttons on the remote control are the Function buttons,
or Fkeys, which provide additional exibility to the Delta PRE remote
control. ink of them as “favorite” buttons that provide direct access to
specic functions or commands not covered by the other buttons. Refer to
the Remote Fkeys description in the Menu System section found later in
the manual for more information.
Note: You may also remotely control the Delta PRE by connecting it to a
Network and using the Classé App, available free of charge in the Apple App
and Google Play stores. e Classé App allows enhanced functionality compared
with the IR remote, and control can be exercised without line-of-site contact
with the unit.
CONFIG
SELECT
SOURCE
SELECT
TONE BAL
MENU HOME
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Initial Setup
Your Delta PRE Stereo Preamp/Processor is delivered with default factory
settings to facilitate initial setup. But we highly recommend that you work with
your Classé dealer for the nal setup of the preamp/processor. Your dealer’s
knowledge and experience with Classé products will ensure that your audio
system is optimized for your listening space.
However, if you can’t wait to get started, this section is designed to assist you in
setting up and becoming familiar with the Delta PRE hardware. Once the initial
setup is complete, be sure to read the rest of this manual to familiarize yourself
with the daily operation and customizable features of your Delta PRE.
Step 1 Connect the Delta PRE and all system components to AC power.
Important! M ake sure everything–especially your power amplifier(s)–is
turned off before connecting power!
Connecting all system components to AC power, before making any
interconnections between components, ensures that every component has a solid
connection to ground. is lessens the chances of a static discharge that may
damage delicate electronics or your loudspeakers.
Step 2 Choose the appropriate cables.
Before you start connecting components together, let’s take a minute to discuss
the cables you will be using. e audio outputs available on the rear panel
include both balanced XLR connectors and unbalanced, or single-ended, RCA
connectors.
Single-ended RCA audio connections are the most popular means of
transmitting audio in consumer electronics. As long as you use high quality, low
capacitance cables, single-ended connections provide very satisfactory results.
However, balanced audio connections between components provide the best
analog signal connection because they eectively double the signal strength.
More importantly, as compared to single-ended connections, they signicantly
improve resistance to common mode noise, therefore enhancing audio
transparency, detail, and dynamics. To fully realize these potential benets, high
quality interconnect cables are required.
Please consult your local Classé dealer for advice on which cables are best suited
for your system.
Step 3 Connect source components to the Delta PRE rear panel.
If necessary, refer to the Rear Panel section in this manual for a detailed
description of each connector found on the rear panel. Your local Classé dealer

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can also provide useful suggestions for what source components you should add
to your system and guidance in setting them up.
Make sure you keep a detailed record of the rear panel
connectors that you used while connecting the source
components!
You’ll need to know what connector(s) each source is attached to when you enter
the setup menus. An Installation Worksheet is included at the end of this manual
to assist you.
NOTE: In the Delta PRE default settings, fourteen rear panel
inputs are associated with corresponding source selections within
the Source Setup menu. Since most users will have fewer sources
connected, the Source Selection page(s) can be simplied by
unchecking the Enable Source box for each unused input. Doing so
removes the corresponding Source button from the Source Selection
page. See the Menu System section for details.
Step 4 Connect the power amplifier(s) to the Delta PRE rear panel.
Important! Verify that the power amplifier(s) is plugged in but powered
OFF before connecting to the Delta PRE!
We recommend using high quality cables with XLR connectors.
NOTE: ese pin assignments are consistent with the standards
adopted by the Audio Engineering Society. Refer to the operating
manuals of your balanced-input power ampliers to verify that the
pin assignments of their input connectors correspond to the Delta
PRE. If you are using Classé ampliers, this note does not apply.
If needed, the pin assignments of the XLR-type male output
connectors are:
Pin 1: Signal ground
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
Connect the Main L&R Outputs, either RCA or XLR, from the rear panel of
the Delta PRE to the corresponding inputs on your amplier(s).
• If you are using a subwoofer, connect the Delta PRE subwoofer
output to the input of the designated amplier or powered
subwoofer.
NOTE: Make sure connections from the subwoofer output go only to an
amplier connected to a subwoofer or a powered subwoofer, as low frequency
signals can damage a small speaker not designed for high output bass
reproduction.

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When connecting a cable, make sure the cable has a good connection and is
rmly attached to the rear panel connectors on both the amplier and the
Delta PRE.
e Delta PRE also provides two Auxiliary analog audio outputs. See the
section on Conguration Setup for more details about the Auxiliary outputs. If
used, connect the AUX output(s) to its corresponding amplier(s) or subwoofer.
Step 5 Connect the loudspeakers to the amplifiers.
Important! Verify that the power amplifier(s) is plugged in but powered
OFF before connecting to the Delta PRE.
Connect each loudspeaker to its designated amplier channel. Pay close
attention to the phase of the speaker connections – always connect an amplier’s
red (+) terminals to the red (+) terminals of the loudspeaker. Likewise, connect black
(–) terminals to black (–) terminals.
Step 6 Power up the system!
Now you are ready to power up your Delta PRE and your audio system.
• Turn the rear panel power switch of the Delta PRE to ON.
e
Standby LED will turn red.
• Press the standby button containing the LED. e initial power-up
cycle of the Delta PRE takes a few seconds.
• When the power-up cycle is complete, the Delta PRE enters Operate
mode and the touchscreen becomes active.
• Press the Standby button to toggle the Delta PRE into and out of
Standby.
e physical setup of the Delta PRE and system components is complete.

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Using the Delta PRE
e Delta PRE’s versatile touchscreen LCD supports your day-to-day operations
and provides access to a exible menu system for controls and setup functions
that aren’t accessed as often. is section of the owner’s manual outlines the use
of the touchscreen in routine operation of the system.
When you bring the Delta PRE out of Standby mode, the touchscreen displays
the Home page of the menu system, as shown below.
Home Page e Home page displays the volume in large font which is easily visible from
across a room. e selected source appears at the bottom-left of the screen. At
the bottom center of the screen the format of the incoming signal is displayed.
is displays the sampling frequency of digital sources as well as the le format
(ALAC, WAV, FLAC, etc.) of streaming Network sources or Bypass if so
selected for analog sources. If Pass-ru is selected for either digital or analog
sources, the volume display will read 0.00 and be greyed out (since the volume
control is not active in this mode).
ere are also indicators at the bottom-right of the screen.
• TONE indicates that the tone control feature is enabled
.
• EQ indicates that the Parametric EQ feature is enabled .
• MONO indicates that the Delta PRE is running in mono mode
rather than stereo.
• e headphone icon indicates that there are headphones plugged in
and that the rear analog outputs are muted.
• e turntable icon indicates that the currently select source is set
for phono mode. Phono may have up to 63dB of gain compared to
non-phono sources.
is page can be quickly accessed at any time by pressing the Home button on
the remote control or tapping the home icon on the touchscreen display.
Source Selection Touching any part of the screen when on the Home page brings up the Source
Selection page. e number of source buttons appearing here corresponds to the
number of inputs that have been set up and are “enabled.” A maximum of nine
sources may appear on one page. If more are enabled, they will be available on
the next page by touching the button in the upper right corner of the page.
See the section on source setup in the Menu System.

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e Delta PRE has up to 18 selectable source buttons which are all
interchangeable: Any source may be assigned to any button location and
associated with any connector.
Touch any source button on the touchscreen to select it as the current source.
e selected source button is shaded. If the source you want to choose is not on
this screen (and you have more than nine source buttons enabled), press the
button for the next page of sources. Or, press the button to return to the
previous page.
e Delta PRE comes from the factory with fteen source buttons labeled and
enabled. To change the default settings and labels or to disable unused buttons,
see the Menu System.
The Menu System
e comprehensive menu system provides setup and conguration controls for
the Delta PRE. ese installation-specic features let you customize how the
Delta PRE works within the context of your particular system. Changes are
made on-the-y, which allows you to quickly set up and modify settings without
constantly being asked if you’re sure you want to make the change and pressing
enter to save. e Delta PRE stores settings in non-volatile memory whenever
the unit is put into standby, so it’s a good practice to put the unit into standby
after making changes. In normal daily operation this happens anyway, but if you
want to be sure a loss of power doesn’t erase your changes, putting the unit into
standby will give you extra assurance.
Pressing the Menu button on the front panel or remote control opens the main
Menu page, which is divided into six sections as shown below.