Rotel A12MKII User guide

Owner’s Manual
Manuel de l’utilisateur
Bedienungsanleitung
Manual de Instrucciones
Gebruikershandleiding
Manuale di istruzioni

A12MKII

Stereo Integrated Amplier
Amplicateur Stéréo Intégré
Stereo-Vollverstärker
Amplicador Integrado Estereofónico
Geïntegreerde stereoversterker
Amplicatore integrato stereo
Integrerad stereoförstärkare

Интегрированный стерео усилитель

Instruktionsbok

Инструкция пользователя

2

POWER

PHONES

A12MKII

PHONO TUNER CD USB OPT COAX AUX PC-USB BT

5V / 2.1A

MENU

SPEAKERS

A B

Important Safety Instructions

Notice

The RS232 connection should be handled by authorized persons only.

WARNING: There are no user serviceable parts inside. Refer all
servicing to qualified service personnel.

WARNING: To reduce the risk of fire or electric shock, do not expose
the unit to moisture or water. Do not expose the unit to dripping or
splashing. Do not place objects filled with liquids, such as vases, on
the unit. Do not allow foreign objects to get into the enclosure. If the
unit is exposed to moisture, or a foreign object gets into the enclosure,
immediately disconnect the power cord from the wall. Take the unit
to a qualified service person for inspection and necessary repairs.

Read these instructions.

Keep these instructions.

Heed all warnings.

Follow all instructions.

Do not use this apparatus near water.

Clean only with dry cloth.

Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.

Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.

Do not defeat the safety purpose of the polarized or grounding-type
plug. A polarized plug has two blades with one wider than the other.
A grounding type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. If
the provided plug does not fit into your outlet, consult an electrician
for replacement of the obsolete outlet.

Protect the power cord from being walked on or pinched particularly
at plugs, convenience receptacles, and the point where they exit
from the apparatus.

Only use attachments/accessories specified by the manufacturer.

Use only with the cart, stand, tripod, bracket, or
table specified by the manufacturer, or sold with
the apparatus. When a cart is used, use with caution
when moving the cart/apparatus combination to
avoid injury from tip-over.

Unplug this apparatus during lightning storms or when unused for
long periods of time.

Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power­supply cord or plug is damaged, liquid has been spilled or objects
have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.

The apparatus should be used in non tropical climate.

The ventilation should not be impeded by covering the ventilation
openings with items, such as newspapers, table-cloths, curtains, etc.

No naked flame sources, such as lighted candles, should be placed
on the apparatus.

Touching uninsulated terminals or wiring may result in an unpleasant
sensation.

You must allow a minimum 10 cm or 4 inches of unobstructed
clearance around the unit.

WARNING: The rear panel power cord connector is the mains power

disconnect device. The device must be located in an open area that
allows access to the cord connector.

The unit must be connected to a power supply only of the type and
voltage specified on the rear panel. (USA: 120 V/60Hz, EC: 230V/50Hz)

Connect the component to the power outlet only with the supplied
power supply cable or an exact equivalent. Do not modify the supplied
cable. Do not use extension cords.

The mains plug is the disconnect of the unit. In order to completely
disconnect the unit from the supply mains, remove the main plug from
the unit and the AC power outlet. This is the only way to completely
remove mains power from the unit.

Use Class 2 wiring for speaker connections to ensure proper installation
and minimize the risk of electrical shock.

The batteries in the remote control should not be exposed to excessive
temperature such as sunshine, re or other heat sources. Batteries
should be recycled or disposed as per state and local guidelines.

This device complies with Part 15 of the FCC Rules. Operation is
subject to the following to conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference
received, including interference that may cause undesired operation.

A12MKII Stereo Integrated Amplier

Rotel products are designed to comply with
international directives on the Restriction of Hazardous
Substances (RoHS) in electrical and electronic
equipment and the disposal of Waste Electrical and
Electronic Equipment (WEEE). The crossed wheelie bin
symbol indicates compliance and that the products must
be appropriately recycled or processed in accordance
with these directives.

This symbol means that this unit is double insulated.
An earth connection is not required.

3

Figure 1: Controls and Connections

Commandes et Branchements
Bedienelemente und Anschlüsse
Controles y Conexiones

Controlli e connessioni
De bedieningsorganen en aansluitingen
Kontroller och anslutningar

Органы управления и разъемы

1 2 34 5 6 7

POWER

PHONES PHONO TUNER CD USB OPT COAX AUX PC-USB BT

5V / 2.1A

SPEAKERS

A B

MENU

0 - =

q w

8 9

e r

t

y

u

i

p [ ] \ a

E

4

A12MKII Stereo Integrated Amplier

Figure 2: Remote Control RR-AX1400

Télécommande infra-rouge RR-AX1400
Fernbedienung RR-AX1400
Mando a Distancia RR-AX1400

Telecomando RR-AX1400
De afstandsbediening RR-AX1400
Fjärrkontroll RR-AX1400

Пульт ДУ RR-AX1400

A

J

B

K

C

L

M

N

D

E

F

G
H

I

Figure 3: Preamp Input and Speaker Output Connections

Branchements des entrées sources et sorties enceintes acoustiques
Anschlussdiagramm
Conexiones para Entrada de Señal y Salida a las Cajas Acústicas
Collegamenti ingressi e diffusori
De signaalingangen en de luidsprekeruitgangen
Signal- och högtalaranslutningar

Подсоединение источников сигнала и акустических систем

5

SPEAKERS

CD PLAYER

PHONO

Rotel A12MKII

E

6

A12MKII Stereo Integrated Amplier

Figure 4: Digital Input Connections

Branchements Entrées numériques
Digitaleingänge-Anschlüsse
Conexiones Entradas Digitales

Digitale ingang verbinding
Collegamenti ingressi digitali
Anslutningar för digitala ingångar

Подсоединение Цифровые входы

Computer

(Supplied)

CLASS 1
LASER PRODUCT
APPAREIL LASER
DE CLASSE 1

Rotel A12MKII

E

Rotel CD14MKII

RP-600A

7

Figure 5: 12V Trigger Connections

Branchements trigger 12 V
12V-Trigger-Anschlüsse
Conexiones para Señal de Disparo de 12V

De 12V trigger aansluitingen
Collegamenti segnali Trigger 12 V
12 V-anslutning för styrsignal

Подсоединение 12-В триггерного сигнала

Rotel A12MKII

E

Rotel CD14MKII

CLASS 1
LASER PRODUCT
APPAREIL LASER
DE CLASSE 1

RP-600A

Rotel T14

WIFI ANTENNA

ANTENNA

FM

OUTPUT

COAXIAL OUT

L

R

DAB

USB

RS232

WIFI ANTENNA

ROTEL LINK

OUT

NETWORK TUNER

12V TRIGGER

OUT

IN OUT

T14

RP-571C

8

A12MKII Stereo Integrated Amplier

Important Notes

When making connections be sure to:

4 Turn off all the components in the system before hooking up any components, including loudspeakers.
4 Turn off all components in the system before changing any of the connections to the system.

It is also recommended that you:

4 Turn the volume control of the amplier all the way down before the amplier is turned on or off.

Remarques importantes

Pendant les branchements, assurez-vous que :

4 Tous les maillons sont éteints avant leur branchement, quels qu’ils soient, y compris les enceintes acoustiques.
4 Éteignez tous les maillons avant de modier quoi que ce soit au niveau de leurs branchements, quels qu’ils soient.

Il est également recommandé de :

4 Toujours baissez le niveau sonore via le contrôle de volume, avant d’allumer ou d’éteindre l’amplicateur.

Wichtige Hinweise

Achten Sie beim Herstellen der Verbindungen auf Folgendes:

4 Schalten Sie alle Komponenten im System ab, bevor Sie Geräte (einschließlich Lautsprecher) anschließen.
4 Schalten Sie alle Komponenten im System ab, bevor Sie Anschlüsse im System verändern.

Ferner empfehlen wir, dass

4 Sie die Lautstärke herunterdrehen, bevor Sie die Endstufe ein- oder abschalten.

Notas Importantes

Cuando realice las conexiones, asegúrese de que:

4 Desactiva todos los componentes del equipo, cajas acústicas incluidas, antes de conectar cualquier nuevo componente en el mismo.
4 Desactiva todos los componentes del equipo antes de cambiar cualquier conexión del mismo.

También le recomendamos que:

4 Reduzca el nivel de volumen de su amplicador a cero antes de activarlo o desactivarlo.

Héél belangrijk

Bij het maken van de verbindingen:

4 Zorg dat niet alleen de A12MKII, maar de gehele installatie uitstaat, als nog niet alle verbindingen gemaakt zijn.
4 Zorg dat niet alleen de A12MKII, maar de gehele installatie ook uitstaat, als u verbindingen gaat wijzigen.

Wij raden u ook aan om

4 de volumeregelaar van de voorversterker geheel dicht te draaien (volkomen naar links) wanneer u uw eindversterker aan- of uitzet.

Note importanti

Quando effettuate i collegamenti assicuratevi di:

4 Spegnere tutti i componenti del sistema prima di collegare qualsiasi componente, inclusi i diffusori.
4 Spegnere tutti i componenti del sistema prima di modicare qualsiasi connessione nel sistema.

Vi raccomandiamo inoltre di:

4 Portare il volume a zero prima di accendere o spegnere l’amplicatore.

Viktigt

Tänk på följande när du gör anslutningar:

4 Stäng av alla komponenter i anläggningen innan du ansluter nya komponenter, inklusive högtalare.
4 Stäng av alla komponenter i anläggningen innan du ändrar någon anslutning i anläggningen.

Vi rekommenderar också föjlande::

4 Vrid ner volymen på förstärkaren helt och hållet innan förstärkaren slås på eller av.

Важные замечания

Перед подсоединением:

4 Выключите все компоненты, включая колонки.
4 Выключите все компоненты в вашей системе, прежде чем что-то в ней менять.

Рекомендуется также:

4 Вывести громкость усилителя на минимум, перед тем как включать или выключать его.

9

Contents

Important Safety Instructions ..........................................2

Figure 1: Controls and Connections 3
Figure 2: Remote Control RR-AX1400 4
Figure 3: Preamp Input and Speaker Output Connections 5
Figure 4: Digital Input Connections 6
Figure 5: 12V Trigger Connections 7
Important Notes 8

About Rotel .......................................................9

Getting Started ....................................................9

A Few Precautions 10
Placement 10
Cables 10

The RR-AX1400 Remote Control .......................................10

Remote Control Batteries 10

AC Power and Control ..............................................10

AC Power Input
Power Switch
12V Trigger Connection u 10

Protection Indicator 2 ..............................................11

Input Signal Connections ............................................11

Phono Input - and Ground Connection (GND) 0 11
Line Level Inputs
Digital Signal Inputs [ 11

Preamp Output p ................................................11

Speaker Outputs ]\ .............................................11

Speaker Selector Switch 5 11
Speaker Selection 11
Speaker Wire Selection 11
Polarity and Phasing 11
Speaker Connection 11

Headphone Output 4 ..............................................12

Display 6 ......................................................12

Front USB Input 3 ...............................................12

APTX Bluetooth Connection e ........................................12

Audio Controls ....................................................12

Volume Control
Balance Control
Tone Control Bypass
Bass and Treble Controls
Source Input Selector

Dimmer Control ...................................................13

Display Dimmer
LED Dimmer

PC-USB Input r ..................................................13

Rotel Link t ....................................................13

EXT REM IN Jack y ...............................................13

RS232 Connector i ...............................................13

Settings Menu ....................................................13

Troubleshooting ...................................................15

Power Indicator Is Not Illuminated 15
Fuse Replacement 15
No Sound 15
Cannot Connect via Bluetooth 15
Playable Audio Formats 15

Specications .....................................................16

a

and Power Indicator 2 10

1

A

11

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12

7

E

9

B

9

B

9

B

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13

D

9 13

About Rotel

Our story began over 60 years ago. Over the decades, we have received
hundreds of awards for our products and satised hundreds of thousands
of people who take their entertainment seriously – like you.

Rotel was founded by a family whose passionate interest in music led them
to manufacture high-delity components of uncompromising quality.

Through the years, that passion has remained undiminished and the family
goal of providing exceptional value for audiophiles and music lovers,
regardless of their budget, is shared by all Rotel employees.

Rotel’s engineers work as a close team, listening to, and ne tuning, each
new product until it reaches their exacting musical standards. They are
free to choose components from around the world in order to make that
product the best they can. You are likely to nd capacitors from the United
Kingdom and Germany, semiconductors from Japan or the United States,

10

while toroidal power transformers are manufactured in Rotel’s own factory.

We all have concerns about our environment. And, as more and more
electronics are produced it is especially important for a manufacturer to do all
it can to engineer products that have a minimum impact on the environment.

At Rotel, we are proud to do our part. We have reduced the lead content
in our products by using special lead-free ROHS solder and components.
Our engineers continually strive to improve power supply efciency without
compromise to quality. When in standby mode Rotel products use minimal
power to meet global Standby Power Consumption requirements.

The Rotel factory is also doing their part to help the environment through
constant improvements to product assembly methods for a cleaner and
greener manufacturing processes.

All of us at Rotel thank you for buying this product. We are sure it will bring
you many years of enjoyment.

Getting Started

12
12

Thank you for purchasing the Rotel A12MKII Stereo Integrated Amplier.

12

When used in a high-quality music audio system, Rotel products will provide

12

years of musical enjoyment.

This amplier is a full featured, high performance component. All aspects
of the design have been optimized to retain the full dynamic range and
subtle nuances of your music. The unit has a highly regulated power supply
incorporating a Rotel custom-designed toroidal power transformer. This low
impedance power supply has ample power reserves, which enables the
amplier to easily reproduce the most demanding audio signals. This type
of design is more expensive to manufacture, but it is better for the music.

The printed circuit boards (PCB) are designed with Symmetrical Circuit
Traces. This ensures that the precise timing of the music is maintained and
faithfully recreated. The circuitry uses metal lm resistors and polystyrene
or polypropylene capacitors in important signal paths. All aspects of this
design have been examined to ensure the most faithful music reproduction.

The main functions of the A12MKII are easy to install and use. If you have
experience with other stereo systems, you shouldn’t nd anything perplexing.
Simply plug in the associated components and enjoy.

10

A12MKII Stereo Integrated Amplier

A Few Precautions

WARNING: To avoid potential damage to your system, turn off ALL
the components in the system when connecting or disconnecting the
loudspeakers or any associated components. Do not turn the system
components back on until you are sure all the connections are correct
and secure. Pay particular attention to the speaker wires. There must
be no loose strands that could contact the other speaker wires, or the
chassis of the amplifier.

Please read this manual carefully. It provides information on how to
incorporate the unit into your system as well as information that will help
you get optimum sound performance. Please contact your authorized Rotel
dealer for answers to any questions you might have. In addition, all of us
at Rotel welcome your questions and comments.

Save the shipping carton and all enclosed packing material for future use.
Shipping or moving the amplier in anything other than the original packing
material may result in severe damage to your amplier.

If included in the box please complete the owner’s registration card or
register on line. Also be sure to keep the original sales receipt. It is your best
record of the date of purchase, which you will need in the event warranty
service is ever required.

Placement

Like all audio components that handle low level signals, this amplier
can be affected by its environment. Avoid placing the unit on top of other
components. Also avoid routing audio signal cables near power cords. This
will minimize the chance it will pick up hum or interference.

The unit generates heat as part of its normal operation. The heat sinks and
ventilation openings in the amplier are designed to dissipate this heat.
The ventilation slots in the top cover must be open. There should be 10 cm
(4 inches) of clearance around the chassis, and reasonable airow through
the installation location, to prevent the amplier from overheating.

Remember the weight of the amplier when you select an installation location.
Make sure that the shelf or cabinet can support it. We recommend installing
the unit in furniture designed to house audio components. Such furniture is
designed to reduce or suppress vibration which can adversely affect sound
quality. Ask your authorized Rotel dealer for advice about component
furniture and proper installation of audio components.

Cables

Be sure to keep the power cords, digital signal cables and analog audio
signal cables in your installation away from each other. This will minimize
the chance of the analog audio signal cables picking up noise or interference
from the power cords or digital cables. Using only high quality, shielded
cables will also help to prevent noise or interference from degrading the
sound quality of your system. If you have any questions see your authorized
Rotel dealer for advice about the best cable to use with your system.

The RR-AX1400 Remote Control

Remote Control Batteries

Two AAA size batteries (supplied) must be installed before the remote control
can be used. To install the batteries, remove the cover on the back of the
RR-AX1400. Install the batteries as shown in the illustration in the battery
well. Test the control for proper operation, then replace the cover. When
the batteries become weak the remote control won’t operate the A12MKII
consistently. Installing fresh batteries should eliminate the problem.

AC Power and Control

AC Power Input

Your unit is congured at the factory for the proper AC line voltage in the
country where you purchased it (either 120 volts AC or 230 volts AC with
a line frequency of either 50 Hz or 60 Hz). The AC line conguration is
noted on a decal on the back panel.

NOTE: Should you move your amplifier to another country, it is possible
to reconfigure it for use on a different line voltage. Do not attempt to
perform this conversion yourself. Opening the enclosure of the unit
exposes you to dangerous voltages. Consult a qualified service person
or the Rotel factory service department for information.

NOTE: Some products are intended for sale in more than one country
and as such are supplied with more than one AC cord. Please only use
the one appropriate for your country/region.

The unit does not draw high levels of current from the power outlet. However,
it should be plugged directly into a polarized wall outlet using the supplied
cable or other compatible cable as recommended by your authorized Rotel
dealer. Do not use an extension cord. A heavy duty multi-tap power outlet
strip may be used if it (and the wall outlet) can handle the current demanded
by the amplier and all the other components connected to it.

If you are going to be away from home for an extended period of time
such as a month-long vacation, it is a sensible precaution to unplug your
amplier (as well as other audio and video components) while you are away.

Power Switch

Press the front panel Power Switch button 1 to turn the unit on. The Power
Indicator light 2 is illuminated when the unit is on. Press Power Switch
button again to turn the unit off.

When the power switch is in the ON position, the remote control ON and
OFF buttons may be used to activate the A12MKII. In Standby mode the
power LED is red, but the display is turned OFF.

12V Trigger Connection

See Figure 5

Some audio components can be turned on automatically when they receive
a 12V turn on signal. The two 12V Trigger Outputs of the A12MKII unit
provide the required signal. Connect compatible components to the amplier
with a conventional 3.5mm mini plug cable. When the unit is in standby
mode or turned off, the trigger signal is interrupted, and the components
controlled by it are turned off.

a

and Power Indicator

1

A

u

2

Some functions can be done with either the front panel controls, or the
supplied RR-AX1400 remote control. When these operations are described,
the square call out numbers refer to the main unit, while the encircled letters
refer to the remote control.

11

Protection Indicator

The amplier has both thermal and over-current protection circuitry that
protects the amplier against damage in the event of extreme or faulty
operating conditions. The protection circuits are independent of the audio
signal and have no impact on sonic performance. Instead, the protection
circuits monitor the temperature of the output devices and shut down the
amplier if temperatures exceed safe limits.

Most likely, you will never see this protection circuitry in action. However,
should a faulty condition arise, the amplier will stop playing and will
display “AMP PROTECTION“ on the front panel. The power indicator 2
on the front panel will turn red.

If this happens, turn the amplier off. Let it cool down for several minutes,
and attempt to identify and correct the problem that caused the protection
circuitry to engage. When you turn the amplier back on, the protection
circuit will automatically reset and the power indicator 2 should turn blue.

In most cases, the protection circuitry activates because of a fault condition
such as shorted speaker wires, or inadequate ventilation leading to an
overheating condition. In very rare cases, highly reactive or extremely
low impedance speaker loads could cause the protection circuit to engage.

If the protection circuitry triggers repeatedly and you are unable to isolate
and correct the faulty condition, contact your authorized Rotel dealer for
assistance in troubleshooting.

2

Preamp Output

The amplier has a set of preamp outputs labeled PRE OUT. The currently
selected source input is available from this output. Typically the PRE OUT
output is used to provide a signal to another integrated amplier or power
amplier, which is used to drive remote speakers.

NOTE: Changes to the settings of the Volume, Balance or Tone controls
affect the signal from the Preamp Output.

Speaker Outputs

See Figure 3

Speaker Selector Switch

The amplier has two sets of speaker outputs, labeled “SPEAKER A” ] and
“SPEAKER B” \. The speaker outputs are controlled by the A-B speaker
selector buttons 5 on the front panel or J on the remote control.

p

]\

5

Speaker Selection

If only one set of speakers will be used at any given time, the speakers may
have an impedance as low as 4 ohms. If there are times when both the A
and B speakers will be used, all the speakers should have an impedance
of 8 ohms or more. Speaker impedance ratings are less than precise. In
practice, very few loudspeakers will present any problems for the unit. See
your authorized Rotel dealer if you have any questions.

Input Signal Connections

NOTE: To prevent loud noises that neither you nor your speakers will
appreciate, make sure the system is turned off when you make any
signal connections.

Phono Input - and Ground Connection (GND) 0

See Figure 3

Plug the cable from the turntable into the appropriate left and right phono
inputs. If the turntable has a “ground” wire, connect it to the screw terminal
to the left of the Phono inputs. It will help prevent hum and noise.

Line Level Inputs

See Figure 3

The CD, Tuner, and Aux inputs of the amplier are “line level” inputs. These
are for connecting components such as CD players or other audio playback
devices with an analog audio output.

The Left and Right channels are labeled and should be connected to the
corresponding channels of the source component. The Left connectors
are white, the Right connectors are red. Use high quality RCA cables for
connecting input source components to the unit. Ask your authorized Rotel
dealer for advice about cables.

Digital Signal Inputs

See Figure 4

There are two sets of digital inputs labeled 1 and 2 for COAXIAL and
OPTICAL respectively. Connect the COAXIAL or OPTICAL outputs of your
source component into these sockets. The digital signals will be decoded
and played by the amplier. The unit is capable of decoding PCM signals
up to 24 bit, 192kHz.

=qw

[

Speaker Wire Selection

Use insulated two-conductor stranded wire to connect the unit to the speakers.
The size and quality of the wire can have an audible effect on the performance
of the system. Standard speaker wire will work, but can result in lower
output or diminished bass response, particularly over longer distances. In
general, heavier wire will improve the sound. For best performance, you
may want to consider special high-quality speaker cables. Your authorized
Rotel dealer can help in the selection of cables for your system.

Polarity and Phasing

The polarity - the positive/negative orientation of the connections - for every
speaker and amplier connection must be consistent so all the speakers will
be in phase. If the polarity of one connection is reversed, bass output will
be very weak and stereo imaging degraded. All wire is marked so you can
identify the two conductors. There may be ribs or a stripe on the insulation
of one conductor. The wire may have clear insulation with different color
conductors (copper and silver). There may be polarity indications printed
on the insulation. Identify the positive and negative conductors and be
consistent with every speaker and amplier connection.

Speaker Connection

Turn off all the components in the system before connecting the speakers.
The amplier has color-coded binding post type speaker connectors on the
back panel. These connectors accept bare wire, connector lugs, or dual
banana type connectors. (Except in European Community countries where
their use is not permitted.)

Route the wire from the amplier to the speakers. Give yourself enough slack
so you can move the components to allow access to the speaker connectors.
If you are using dual banana plugs, connect them to the wires and then
plug into the backs of the binding posts. The thumbscrews of the binding
posts should be screwed in all the way (clockwise).

12

A12MKII Stereo Integrated Amplier

If you are using terminal lugs, connect them to the wires. If you are attaching
bare wires directly to the binding posts, separate the wire conductors and
strip the insulation from the end of each conductor. Be careful not to cut
into the wire strands. Unscrew (turn counterclockwise) the binding post
thumbscrews. Place the connector lug or wire around the binding post
shaft. Turn the thumbscrews clockwise to clamp the connector lug or wire
rmly in place.

NOTE: Be sure there are no loose wire strands that could touch adjacent
wires or connectors.

Headphone Output

The headphone output allows you to connect headphones for private listening.
This output accepts a standard 3.5mm (1/8”) mini stereo headphone
connector. Plugging in a set of headphones does not cut off the signal to the
speakers. Use the front panel 5 or remote control J A-B speaker selector
buttons to turn off the speakers.

NOTE: Because the sensitivity of speakers and headphones can
vary widely, always reduce the volume level before connecting or
disconnecting headphones.

Display

6

4

Balance Control

The Balance Control adjusts the left-to-right balance of the sound output. The
factory default is the center position or “0”. To change the balance from
the front panel, press the MENU 9 button to toggle the front display to
BALANCE SETTING mode. Then press the - or + buttons on the front panel to
change the value to LEFT or RIGHT. The value can change from L15 to R15.

NOTE: This setting is saved permanently including after powering off
the A12MKII.

To make temporary changes not saved after power off, from the remote,
press the BAL B button to access the BALANCE SETTING menu, then press
the up/down/left/right C arrow buttons to adjust.

Tone Control Bypass

Bass and Treble Control (Tone Control) circuits are bypassed at factory
default to ensure the purest possible sound. The front display will show
TONE BYPASS. To turn on the tone control from the front panel, press the
MENU 9 button to toggle to the Bypass control then press the - or + buttons
to turn bypass on or off.

NOTE: This setting is saved permanently including after powering off
the A12MKII.

To temporarily changes the Tone Control Bypass, press the BYPASS B button
on the remote control to toggle the Bypass mode enabled and disabled.

9

B

9

B

The front panel display shows the source selected, volume level and tone
settings. The display provides access to the setup and conguration menu
options of the amplier.

Front USB Input

The front USB input can be connected to an iPhone, iPad or iPod device
providing music playback to the amplier. To enable audio playback using
one of these devices simply plug the device into the front USB and select
USB as the desired source. The device will remain active allowing search
and play functions.

3

APTX Bluetooth Connection e

The Bluetooth Antenna e on the unit’s back panel is for wireless streaming
via Bluetooth, from your device (i.e. mobile phones, tablets or computers).
From your device, look for “Rotel Bluetooth” and connect to it. Connection
is normally automatic, but if prompted for a password, please enter “0000”
on your device. The unit supports both traditional Bluetooth and APTX
Bluetooth audio streaming.

Audio Controls

Volume Control

Turn the control clockwise to increase the volume, or counter clockwise to
decrease the volume. From the remote control press the volume + or - button
to turn the volume up or down. Press the MUTE F button to completely
mute the volume.

7

E

Bass and Treble Controls

Set the Bass or Treble controls from the front panel by pressing the MENU

button to the Bass and Treble Setting menu in sequence. Then press

9

the - or + buttons to adjust the value. The Bass and Treble values range
from -10 to +10.

NOTE: These settings are saved permanently including after powering
off the A12MKII.

To temporarily change the Bass and Treble settings from the remote control,
press the BASS or TREB B button, then press the up/down/left/right
arrow buttons on the remote to adjust the value.

NOTE: Bass and Treble changes are only available when Tone Bypass
is disabled (see Tone Control Bypass section).

A properly setup high-performance audio system produces the most natural
sound with little or no adjustment of the tone controls. Use these controls
sparingly. Be particularly careful when turning the controls up. This increases
the power output in the bass or treble range, increasing the load on the
amplier and speakers.

NOTE: Setting the Bass and Treble controls do not automatically turn
on the tone control. To turn on tone control, refer to previous section
Tone Control Bypass.

Source Input Selector

Press the corresponding input button on the front panel 8 or remote control

to select the desired listening source.

I

Push the front panel source buttons to toggle between Optical 1 - 2, Coaxial
1- 2 and Aux 1 - 2 or use the dedicated source button on the remote control.

8

9

I

B

C

13

Dimmer Control

9

9

D

Display Dimmer

To change the brightness of the front display, press the MENU 9 button
to toggle to the DIMMER Setting. Then press the - or + buttons on the front
panel to change the display brightness.

NOTE: This setting is saved permanently including after powering off
the A12MKII.

To temporarily change the display brightness, press the DIM D button on
the remote.

LED Dimmer

To change the brightness of the Power LED and the two Speaker Seletor
LEDs on the front panel, press the MENU 9 button to toggle to the LED

DIMMER Setting. Then press the - or + buttons on the front panel to change
the LEDs brightness.

NOTE: This setting is saved permanently including after powering off
the A12MKII.

PC-USB Input r

See Figure 4

Connect this input using the supplied USB cable to the PC-USB socket of
your computer.

Being Roon Tested means that Rotel and Roon have collaborated to ensure
you have the best experience using Roon software and the A12MKII together,
so you can just enjoy the music.

For the best user experience it is suggested to use USB Audio Class 2.0
when using Roon.

NOTE: USB Audio Class 2.0 requires installation of the Windows PC
driver on the USB stick included with the A12MKII.

NOTE: MAC computers do not require a driver to support PC-USB
Audio Class 1.0 or 2.0.

NOTE: Upon successful installation of the driver, you may need to select
the ROTEL audio driver from the audio/speaker setup of your computer.

Rotel Link

Rotel Link is not used for A12MKII.

EXT REM IN Jack

This 3.5mm mini-jack receives command codes from industry-standard infrared
receivers via hard-wired connections. This feature could prove useful when
the unit is installed in a cabinet and the front-panel sensor is blocked. Consult
your authorized Rotel dealer for information on these external repeaters and
the proper wiring of a jack to t the mini-jack receptacle.

t

y

The A12MKII supports both USB Audio Class 1.0 and USB Audio Class

2.0 modes. Windows computers do not require installation of a driver for
USB Audio Class 1.0 and support playback of audio up to 96kHz sampling
rates. The Factory Default setting is USB Audio Class 1.0.

To take advantage of USB Audio Class 2.0 audio playback supporting up to
384kHz sampling rates you will need to install the Windows driver supplied
on the USB stick included with the A12MKII. You will also need to switch
the A12MKII to USB Audio Class 2.0 playback mode with the following:

• Press MENU on the front panel until “PC-USB CLASS” appears on the display.

• Select “2.0” using the “+” button.

• Power cycle the A12MKII and reboot your PC after changing the USB
Audio mode to ensure both units are properly congured.

Many audio playback applications do not support 384kHz sampling rate.
Please conrm your audio player supports 384kHz audio and you have
384kHz audio les to properly playback this sample rate. Also, you may
need to congure the audio driver in your PC to output 384kHz or your
computer may “down sample” to a lower audio sample rate. For more
information please refer to your audio player or operating system information.

The A12MKII has been certied as Roon Tested and compatible with Roon
software via PC-USB.

RS232 Connector

The A12MKII can be controlled via RS232 for integration with automation
systems. The RS232 input accepts a standard straight DB-9 Male-to-Female
cable.

For additional information on the connections, software, and operating codes
for RS232 control of the A12MKII, contact your authorized Rotel dealer.

i

Settings Menu

You can access the SETUP menu from the front panel by pressing the MENU

button or the K button on the remote. You can change the value of

9

the selected option by pressing the - or + buttons on the front panel or the
up/down/left/right C arrow buttons on the remote. Step through the
sub-menus by pressing the MENU 9 button on the front panel or the K
button on the remote.

• TONE BYPASS: TONE BYPASS on/off (For more information refer to Tone
Control Bypass section).

NOTE: This setting is stored permanently even after the A12MKII is
powered off.

• BASS: BASS level can be changed to desired settings. (For more information
refer to Bass and Treble Control section.)

NOTE: This setting is stored permanently even after the A12MKII is
powered off.

14

A12MKII Stereo Integrated Amplier

• TREBLE: TREBLE level can be changed to desired settings. (For more

information refer to Bass and Treble Control section.)

NOTE: This setting is stored permanently even after the A12MKII is
powered off.

• BALANCE: Change left/right balance. (For more information refer to
Balance Control section.)

NOTE: This settings is stored permanently even after the A12MKII is
powered off.

• DIMMER: Dims the front display.

NOTE: This setting is stored permanently even after the A12MKII is
powered off.

• LED DIMMER: Dims the Power LED and the LEDs above the Speaker Selector
buttons on the front panel.

NOTE: This setting is stored permanently even after the A12MKII is
powered off.

• POWER ON MAX VOL: This sets the maximum volume level when the unit
is turned on. “45” is the factory default.

NOTE: Power On Max Volume settings do not apply to sources
configured with Fixed Gain.

• OFF TIMER: The A12MKII can be congured to automatically power off if
unused for a specied period. If no changes are made to the unit within
the specied “Off Timer” period the unit will automatically go to STANDBY
mode. The Auto Power Off timer will be restarted if changes are made to
the volume, source or playback. The default for Off Timer is set to 20 MINS.

Valid settings include: 20MINS (Default), DISABLE, 1 HOUR, 2 HOURS,
5 HOURS, 12 HOURS.

• FIXED GAIN: Congures a Fixed Volume level for a specied input. To
enable this feature, select the desired xed volume level for AUX1, AUX2,
USB, PC-USB, Optical 1, Optical 2, Coax 1, Coax 2, or Bluetooth. When
enabled and the input with a Fixed Volume is selected, the Volume level
will immediately be set to the specied level.

Valid settings include: VARIABLE, FIXED MIN, FIXED 01-95, FIXED MAX.

• AUX1 VOL: VARIABLE (disabled) is factory default.

• AUX2 VOL: VARIABLE (disabled) is factory default.

• USB VOL: VARIABLE (disabled) is factory default.

• PC-USB VOL: VARIABLE (disabled) is factory default.

• OPT1 VOL: VARIABLE (disabled) is factory default.

• OPT2 VOL: VARIABLE (disabled) is factory default.

• COAX1 VOL: VARIABLE (disabled) is factory default.

• COAX2 VOL: VARIABLE (disabled) is factory default.

• BTOOTH VOL: VARIABLE (disabled) is factory default.

NOTE: The Volume knob on the front panel and Volume +/- buttons
on the IR remote are disabled when the volume is Fixed. To disable this
feature set the Fixed Volume level to “Variable”.

• PC-USB CLASS: Changes supported PC-USB Audio Class of the attached
device.

NOTE:

Some computers attached to the PC-USB do not support USB
Audio Class 2.0 and do not support 24/192 audio playback. If needed
the PC-USB can be congured for USB Audio Class 1.0. Please consult
your computer operating system for details.

• SIGNAL SENSE: Check if an audio signal is present on the configured
Signal Sense input. The A12MKII monitors the data stream to determine if
there is audio. If there is no audio detected for 10 minutes, the A12MKII
will enter Signal Sense Power Mode. When in Signal Sense Power
Mode and the A12MKII detects audio on Signal Sense input, the unit will
automatically power on. When Signal Sense is set to AUTO the A12MKII
will monitor the Coax, Optical and Bluetooth sources and if a signal is
detected on any of these inputs the unit will power on and select that input
as the active source. To disable this function, select the OFF option which
is the factory default setting.

NOTE: When the SIGNAL SENSE function is activated the A12MKII
will consume additional power in signal sense standby mode.

NOTE: Due to local power consumption regulations the SIGNAL SENSE
function is not available in all markets.

• S/W VERSION: This shows the current software version loaded into the
amplier.

• PC-USB VERSION: This shows current loaded software version for PC-USB
processor.

• FACTORY DEFAULT: This sets the unit back to the original state as when
it left the factory. Press the + button on the front panel or the ENT button

on the remote control to enter factory reset setting. And then press the +
button or ENT again to begin reset, or press the MENU button to cancel.

NOTE: All previously configured options will be erased and reset to
the factory default settings.

15

Troubleshooting

Most difculties in audio systems are the result of incorrect connections, or
improper control settings. If you encounter problems, isolate the area of the
difculty, check the control settings, determine the cause of the fault and
make the necessary changes. If you are unable to get sound from the unit,
refer to the suggestions for the following conditions:

Power Indicator Is Not Illuminated

The Power Indicator and the basic items in the Display window should be
illuminated whenever the unit is plugged into the wall power outlet and the
Power button is pushed in. If it does not illuminated, test the power outlet
with another electrical device, such as a lamp. Be sure the power outlet
being used is not controlled by a switch that has been turned off.

Fuse Replacement

If another electrical device works when plugged into the power outlet, but
the Power Indicator still will not illuminated when the unit is plugged into
the wall outlet, it indicates that the internal power fuse may have blown.
If you believe this has happened, contact your authorized Rotel dealer to
get the fuse replaced.

No Sound

Check the signal source to see if it is functioning properly. Make sure the
cables from the signal source to the amplier inputs are connected properly.
Be sure the Input Source is set to the proper input. Check the wiring between
the amplier and the speakers.

Playable Audio Formats

USB Apple (iPhone, iPod, iPad)

Format Notes

Any supported file
loaded to Apple device.

APTX Bluetooth

Format Notes

Any format supported
by the sending device.

PC-USB

Format Notes

Format determined
by the Media Player/
Server software that
you use.

Coax/Optical

Format Notes

SPDIF LPCM

Any supported le loaded to Apple device. Phone may
resample depending on stored format. May exclude
Apps designed to play formats not originally supported
by the sending device.

May exclude Apps designed to play formats not originally
supported by the sending device.

Any supported format by the PC software
PCM Audio:

44.1k, 48k, 88.2k, 96k, 176.4k, 192k, 384k
(16 bit, 24 bit and 32bit)
Roon Tested

44.1k, 48k, 88.2k, 96k, 176.4k, 192k
16 bit, 24 bit

Cannot Connect via Bluetooth

If you cannot pair your Bluetooth enabled device to the A12MKII, delete the
memory of the previous connection on your device. On your device this is
often listed as “Forget this Device”. Then try to make the connection again.

16

A12MKII Stereo Integrated Amplier

Specications

Maximum Power OutputMaximum Power Output 120 watts/ch, 4 Ohms
Continuous Power Output Continuous Power Output 60 watts/ch, 8 Ohms
Total Harmonic Distortion Total Harmonic Distortion < 0.018%
Intermodulation Distortion Intermodulation Distortion (60 Hz : 7k Hz, 4:1) < 0.03%
Frequency ResponseFrequency Response
Phono Input 20 Hz - 20k Hz, 0 ± 0.5 dB

Line Level Inputs 10 Hz - 100k Hz, 0 ± 0.5 dB

Damping Factor Damping Factor (20 - 20,000 Hz, 8 ohms) 220
Input Sensitivity / Impedance Input Sensitivity / Impedance
Phono Input (MM) 3.4 mV / 47k Ohms

Line Level Inputs (RCA) 230 mV / 24k Ohms

Input Overload Input Overload
Phono Input 50 mV

Line Level Inputs 4 V

Preamp Output / ImpedancePreamp Output / Impedance 1.2 V / 470 Ohms
Tone Controls - Bass / TrebleTone Controls - Bass / Treble ± 10 dB at 100 Hz / 10k Hz
Signal to Noise Ratio Signal to Noise Ratio (A weighting)
Phono Input 90 dB

Line Level Inputs 100 dB

Digital Section Digital Section
Frequency Response Frequency Response 10 Hz - 90k Hz (0 ± 2 dB, MAX)
Signal to Noise Ratio Signal to Noise Ratio (A weighting) 103 dB
Input Sensitivity/Impedance Input Sensitivity/Impedance 0 dBfs/75 ohms
Preamplifier Output Level Preamplifier Output Level 1.4 V (at - 20dB)
Digital Inputs Digital Inputs SPDIF LPCM
(up to 192k Hz 24 bit)
PC-USB PC-USB USB Audio Class 1.0

(up to 96kHz 24bit)
USB Audio Class 2.0
(up to 384kHz 32bit)*
*Driver installation required
Roon Tested

GeneralGeneral
Power Requirements Power Requirements
USA 120V, 60 Hz
EC 230V, 50 Hz
Standby Power Consumption Standby Power Consumption < 0.5W
Power Consumption Power Consumption 230 Watts
BTU BTU (4 ohms, 1/8th power) 632 BTU/h
Dimensions Dimensions (W, H, D) 430 x 93 x 345 mm
17” x 3 5/8” x 13 1/2”
Panel HeightPanel Height 80 mm / 3 1/8”.
WeightWeight (net) 8.76 kg, 19.31 lbs.

“Made for iPod,” and “Made for iPhone,” means that an electronic accessory
has been designed to connect specically to iPod or iPhone, respectively, and
has been certied by the developer to meet Apple performance standards.
Apple is not responsible for the operation of this device or its compliance with
safety and regulatory standards. Please note that the use of this accessory
with iPod, or iPhone may affect wireless performance.

iPhone, iPod, iPod classic, iPod nano, and iPod touch are trademarks of
Apple Inc., registered in the U.S. and other countries.

All specications are accurate at the time of printing.
Rotel reserves the right to make improvements without notice.

Rotel and the Rotel HiFi logo are registered trademarks of The Rotel Co., Ltd.
Tokyo, Japan.

The Rotel Co. Ltd.

Tachikawa Bldg. 1F.,
2-11-4, Nakane, Meguro-ku,
Tokyo, 152-0031
Japan

Rotel USA

Sumiko
11763 95th Avenue North
Maple Grove, MN 55369
USA
Phone: [phone] (option 2)
E-mail: [e-mail]

Rotel Canada

Kevro International
902 McKay Rd. Suite 4
Pickering, ON L1W 3X8
Canada
Tel: [phone]

Rotel Europe

Dale Road
Worthing, West Sussex BN11 2BH
England
Phone: + 44 (0)1903 221 710
Fax: [phone]

www.rotel.com

A12MKII Owner’s Manual Ver C 010722 English