McIntosh MXA-70 Owners Manual

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Page 1

McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www mcintoshlabs.com

MXA70

Integrated Audio System

Owner’s Manual

Page 2

The lightning ash with arrowhead, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufcient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

WARNING - TO REDUCE RISK

OF FIRE OR ELECTRICAL

SHOCK, DO NOT EXPOSE

THIS EQUIPMENT TO RAIN OR

MOISTURE.

IMPORTANT SAFETY

INSTRUCTIONS!

PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT.

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

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

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other appa-

ratus (including ampliers) that produce heat.

9. 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

NO USER-SERVICEABLE PARTS

INSIDE. REFER SERVICING TO

QUALIFIED PERSONNEL.

third grounding prong. The wide blade or the third prong are provided for your safety. If

the provided plug does not t into your outlet,

consult an electrician for replacement of the obsolete outlet.

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

11. Only use attachments/accessories specied by

the manufacturer.

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

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

14. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-

To prevent the risk of electric

shock, do not remove cover or

back. No user-serviceable parts

inside.

supply 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.

15. Do not expose this equipment to dripping or

splashing and ensure that no objects lled

with liquids, such as vases, are placed on the equipment.

16. To completely disconnect this equipment from the a.c. mains, disconnect the power supply cord plug from the a.c. receptacle.

17. The mains plug of the power supply cord shall remain readily operable.

18. Do not expose batteries to excessive heat such

as sunshine, re or the like.

19. Connect mains power supply cord only to a mains socket outlet with a protective earthing connection.

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Thank You

Your decision to own this McIntosh MXA70 Integrated Audio System ranks you at the very top among discriminating music listeners. You now have the best. The McIntosh dedication to precision performance assures many years of musical enjoyment. Please take a short time to read the information in this manual. We want you to be as familiar as possible with all the features and functions of your new McIntosh.

Please Take A Moment

The serial number, purchase date and McIntosh Dealer name are important to you for possible insurance claim or future service. The spaces below have been provided for you to record that information:

Serial Number: _______________________________

Purchase Date: _______________________________

Dealer Name: ________________________________

Technical Assistance

If at any time you have questions about your McIntosh product, contact your McIntosh Dealer who is familiar with your McIntosh equipment and any other brands that may be part of your system. If you or your Dealer wish additional help concerning a suspected problem, you can receive technical assistance for all McIntosh products at:

McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3512 Fax: 607-724-0549

Customer Service

If it is determined that your McIntosh product is in need of repair, you can return it to your Dealer. You can also return it to the McIntosh Laboratory Service Department. For assistance on factory repair return procedure, contact the McIntosh Service Department at:

McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903 Phone: 607-723-3515 Fax: 607-723-1917

Table of Contents

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

Thank You and Please Take a Moment ...............................3

Technical Assistance and Customer Service ....................... 3

Table of Contents ................................................................. 3

General Information ............................................................ 4

Connector and Cable Information ....................................... 4

Introduction ......................................................................... 5

Performance Features .......................................................... 5

Dimensions .......................................................................... 6

Installation ........................................................................... 7

Connections:

Rear Panel Connections ....................................................... 8

Connecting Components and

Optional Loudspeakers .............................................. 10 -11

System Thru Connections ................................................. 12

External Power Amplifier Connections ............................ 13

Remote Control and Front Panel:

Remote Control Push-buttons ........................................... 14

How to use the Remote Control ......................................... 15

Front Panel Displays, Controls,

Push-button and Jack ......................................................... 16

Setup Mode:

How to Operate the Setup Mode ....................................... 17

Default Settings .......................................................... 17

Fi rmwa r e Ve r sio n ....................................................... 18

Setup Mode: con’t

Input Renaming .......................................................... 18

Speaker Size ...............................................................19

Subwoofer Mode .........................................................19

Power Mode ................................................................ 19

Remote Control ........................................................... 20

Operation:

How to Operate the MXA70.............................................. 21

Power On/Off ............................................................. 21

Source Selection ......................................................... 21

Volume Control .......................................................... 21

Trim Functions:

Trim Functions Introduction ............................. 21

Bass Boost ......................................................... 21

Balance .............................................................. 22

Trim Level .........................................................23

Mono/Stereo Mode ........................................... 22

Meter Backlight ................................................23

Display ..............................................................23

Digital Audio (Display), Mute .......................... 23

Headphone Jack, Headphone HXDTM ........................ 24

Output Control ............................................................ 24

Prof ile Mode .......................................................... 24-26

Power Output Meters and Power Guard .....................26

Using a Separate Power Amplifier ............................. 26

Optical and Coaxial Digital Inputs ............................ 27

USB Input Operation and Driver Installation ............ 27

Installing the Software .......................................... 27-28

USB Audio Driver Operation and Reset

of Microprocessors ................................................. 29

Resetting the MXA70 to default settings ................... 27

Specifications ............................................................ 30

Packing Instructions ................................................. 31

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General Information, Connector and Cable Information

General Information

1. For additional connection information, refer to the

owner’s manual(s) for any component(s) connected

to the MXA70.

2. Apply AC Power to the MXA70 and other McIntosh Component(s) only after all the system components are connected together. Failure to do so may cause a malfunction of system operations as the Microprocessor’s Circuitry inside the components is active when AC Power is applied.

3. The MXA70 includes an Auto Off Power Save Feature and the default setting is enabled. For additional information including how to disable it, refer to page 19.

4. When Power Amplifier Protection Circuitry of the MXA70 has activated, the Front Panel Power Guard LEDs are illuminated continuously and the sound will be muted.

5. If the Power Transformer has overheated due to improper ventilation and/or high ambient operating temperature, AC Power is removed from the MXA70. Normal operation will resume when the operating temperature is in a safe range again.

6. The Remote Control supplied with the MXA70 is also capable of operating other McIntosh Components. These other components may include Preamplifiers, A/V Control Centers, Integrated Amplifiers, Source Components and Integrated Audio Systems. There is a chance the MXA70 and one of these other components may both respond to a command issued by the MXA70 Remote Control or the Remote Control supplied with the other component. This could affect operations such as Volume Up/Down and Power On/Off. Many of these other McIntosh components have the ability to utilize what is known as “Alternate Codes” to prevent them from responding to commands issued

by the MXA70 Remote Control. For additional information refer to the Owner’s Manual supplied with the other McIntosh Component and look in the “Setup Section - Remote Control Codes” of the manual. In those rare instances where using the “Alternate Codes” is not possible, the Remote Control Sensor on the MXA70 can be switched Off and the Front Panel Controls can be used for operation instead of using the Remote Control. Refer to page 20.

7. For the best performance and safety, it is important to always match the impedance of the Loudspeaker to the Power Amplifier connections. Refer to pages 10 and 11.

Note: The impedance of a Loudspeaker actually var-

ies as the Loudspeaker reproduces different frequencies. As a result, the nominal impedance rating of the Loudspeaker (usually measured at a midrange frequency) might not always agree with the impedance of the Loudspeaker at low frequencies where the greatest amount of power is required. Contact the Loudspeaker Manufacturer for additional information about the actual impedance of the Loudspeaker before connecting

it to the McIntosh MXA70.

8. Sound Intensity is measured in units called Decibels and “dB” is the abbreviation.

9. When discarding the unit, comply with local rules or regulations. Batteries should never be thrown away or incinerated but disposed of in accordance with the local regulations concerning battery disposal.

10. For additional information on the MXA70 and other McIntosh Products please visit the McIntosh Web Site at www.mcintoshlabs.com.

Connector and Cable Information

XLR Connectors

Below is the Pin configuration for the XLR Balanced Input Connectors on the MXA70. Refer to the diagram for connection: PIN 1: Shield/Ground PIN 2: + Input PIN 3: - Input

XLR Connectors (Digital Audio)

Below is the Pin configuration for the XLR Balanced Digital Audio Input Connector on the MXA70. Refer to the diagram for connection: PIN 1: Shield/Ground PIN 2: + Signal PIN 3: - Signal

Note: When connecting to the MXA70 Digital XLR Input

connector it is important to use a twisted pair shielded cable.

Power Control Connectors

The Power Control Input Jack receives Power On/

Off Signals (+12 volt/0 volt) when connected to other

McIntosh Components. The Power Control Output Jack sends Power On/Off Signals

(+12 volt/0 volt) when connected to

other McIntosh Components. An additional connection is for controlling the illumination of the Power Output Meters on McIntosh Power Amplifiers. A 3.5mm stereo mini phone plug is used for connection to the Power Control Jacks.

PIN 3

Power Control

Meter Illumination Control

PIN 1PIN 2

Ground

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Introduction

Now you can take advantage of traditional McIntosh standards of excellence in the MXA70 Integrated Audio System. The Power Amplifier section of the MXA70 will drive Headphones or Loudspeakers to a high level of performance.

The flexible Preamplifier section provides connections for various input sources, including Digital sources and music streaming from the Internet via an USB Computer connection.

The MXA70 reproduction is sonically transparent and absolutely accurate. The McIntosh Sound is “The Sound of the Music Itself.”

phone Jack for private listening. Loudspeaker Listening is automatically switched Off when Headphones are connected.

• Superior Protection

The patented McIntosh Power Guard circuit prevents amplifier clipping and protects your valuable Headphones and Loudspeakers. Sentry Monitor protects the Power Output Circuitry and Headphones in the event of an impedance mismatch. Built-in Thermal Protection Circuits guard against overheating. Direct Current Detection and Protection is provided for both Headphones and Loudspeakers.

Performance Features

• Power Output

The McIntosh MXA70 is designed for connection of a single 8 ohm Loudspeaker per channel and will deliver 50 watts per channel with less than 0.005% distortion. The Power Amplifier uses ThermalTrak1 Output Transistors for lower distortion and cool operation.

• Autoformer Designed for Headphones

The MXA70 is the first McIntosh Amplifier using a specially designed Autoformer for Headphones. There are three selectable impedances ranges, allow connection of Headphones from 8 ohms thru 600 ohms.

• HXD

for Headphones

The MXA70 Headphone Crossfeed Director Circuitry

TM )

(HXD phone Listening. HXD

improves the sound localization for Head-

restores the directionality component of the spatial sound stage normally heard with Loudspeaker listening.

• Automatic Output Switching

The MXA70 has a Front Panel one-quarter inch Head-

ThermalTrak™ and ON Semiconductor are trademarks of Semiconductor Components Industries, LLC

• Electronic Input Switching and Balanced Input

The Preamplifier uses Logic Circuits controlling Electromagnetic Switches on all inputs and operating functions for reliable, noiseless, distortion free switching. There is a Balanced Input for connection of a source component.

• Analog and Digital Audio Inputs

The MXA70 has Unbalanced and Balanced Inputs for connection of Analog sources. There are Coaxial,

Optical, Balanced Digital (AES/EBU) and USB

Digital Inputs. The MXA70 decodes PCM Signals and upsamples the Digital Signal to 192kHz with 32Bit resolution before the Digital to Analog process begins.

• Multifunction OLED Display

The Front Panel Display indicates source selection, volume levels, trim settings and setup functions.

• Illuminated Meters

The Illuminated Power Output Meters on the MXA70 are peak responding, and indicate the output of the amplifier.

Introduction and Performance Features

• Power Control and Remote Control

The Power Control Output connection provides convenient Turn-On/Off of McIntosh Source Components.

• Special Power Supply

The large Power Transformer, multiple large filter capacitors and regulated Power Supply ensures stable noise free operation even though the power line varies.

• McIntosh Custom Binding Posts

McIntosh Patented gold plated output terminals deliver high current output. They accept large diameter wire and spade lugs.

• Glass Front Panel and Super Mirror Chassis

The MXA70 has the famous McIntosh Illuminated Glass Front Panel with custom designed Fiber Optic Light Diffusers and extra long life Light Emitting Di-

odes (LEDs). The Stainless Steel Super Mirror Finish

Chassis ensures the pristine beauty of the MXA70 will be retained for many years.

• High Excursion Woofer and Dome Tweeter

The 4” Woofer/Midrange has a very large magnetic flux stabilizing elements delivers lower bass notes with less distortion. The three-quarter inch titanium tweeter vice coil is magnetic-fluid cooled (for less

thermal compression) and reproduces frequencies up

to 45,000 Hz.

• Cast Aluminum Loudspeaker Enclosure

The durable cast aluminum enclosure is finished in a high gloss, piano black. All of the components making up the loudspeaker were designed to achieve correct time arrival in the reproduced musical sound (also

known as group delay).

Page 6

Dimensions

The following dimensions can assist in determining the best location for your MXA70 System. There is additional information on the next page pertaining to installing the MXA70 System into cabinets.

Front View of the MXA70

23-1/4"

59.05cm

Dimensions

Side Views of the MXA70 Center Section

10-7/8"

27.6cm

5-9/16"

14.1cm

12.7cm

11-1/2"

29.2cm

Rear View of the MXA70

10-3/4"

27.3cm

10-5/8"

27.9cm

14-5/8"

37.1cm

Side Views of the MXA70 Loudspeaker

10-3/4"

27.7cm

5-3/8"

13.7cm

10-13/16"

27.5cm

Page 7

Installation

The MXA70 Integrated Audio System is designed to be placed upright on a table or shelf, standing on its feet. The required ventilation requirements are shown. Always provide adequate ventilation for your MXA70. Cool operation ensures the longest possible operating life for any electronic instrument. Do not install the MXA70 directly above a heat generating device, such as a Power Amplifier. Allow at least 12 inches

(30.5cm) above the top and 5/8 inches (1.6cm) below

the bottom of the Amplifier, so that airflow is not

obstructed. Allow 19 inches (48.3cm) of depth for

airf low and cable connections.

MXA 70 Front View

2.5cm

Installation

12"

30.5cm

2.5cm

MXA 70 Side View

12"

30.5cm

19"

48.3cm

Page 8

MXA70 Rear Panel Connections

RIGHT OUTPUT connections for an 8 ohm Loudspeaker

Main Fuse holder, refer to information on the back panel of your MXA70 to determine the correct fuse size and rating

LEFT OUTPUT connections for an 8 ohm Loudspeaker

DIGITAL AUDIO INPUTS for components with Digital Optical, Coaxial and Balanced

Digital (AES/EBU)Outputs

sending digital audio signals

Connect the MXA70 power cord to a live AC outlet. Refer to information on the back panel of your MXA70 to determine the correct voltage for your unit

PWR CNTRL (Power Control) IN

receives a turn On/Off signal from a McIntosh Component; PWR CNTRL OUT sends a turn On/Off signal to an other McIntosh Component

USB Digital Audio Input for connection to a computer

BALANCED INPUT accept high level signal from a source with a balanced output

PREAMP OUTPUT sends signals to an external Power Amplifier or Powered Subwoofer

UNBALanced INPUT accept high level signal from a source with an unbalanced output

Page 9

Notes

Page 10

Connecting Components

The MXA70 has the ability to automatically switch power On/Off to McIntosh Source Components via the Power Control connection.

The connection instructions below, together with the MXA70 Connection Diagram on the next page is an example of a typical audio system. Your system may vary from this, however the actual components would be connected in a similar manner. For additional information refer to “Connector and Cable Information” on page 4.

Note: When the MXA70 is being added to an existing

Audio (or Audio/Video) System, please proceed to page 12. If the MXA70 will be used with an external Power Amplifier, please refer to page 13.

Power Control Connections:

1. Connect a Control Cable from the MXA70 PWR

CTRL (Power Control) OUT Jack to the Power

Control In on the Tuner.

2. Connect a Control Cable from the Tuner Power Control Out Jack to the Disc Player Power Control In Jack.

3. Connect any additional McIntosh Components in a similar manner, as outlined in steps 1 thru 2.

Audio Connections:

4. Connect the Audio Cable from the MXA70 UNBAL 1 L & R jacks to the Disc Player Fixed Audio Output Jacks.

Note: The Balanced Input may be used instead of the

UNBAL Unbalanced Inputs.

5. Connect any additional Components in a similar manner, as outlined in step 4.

Optional Digital Audio Connections:

6. Connect an Coaxial Cable from the MXA70 DIGITAL AUDIO INPUT COAX connector to the Digital Audio Out Optical Connector on the Tuner.

Note: The OPTICAL Input (on the MXA70 and on the

Tuner) may be used instead of the Coaxial Connections.

Optional USB Connection:

7. Connect a USB cable with (type A to type B) connectors from the MXA70 USB Input to an available USB connector on a Computer.

Output Terminals

When connecting the Loudspeaker Hookup Cables to the MXA70 Output Terminals please follow the steps below:

1. Rotate the top of the Output Terminal Post counterclockwise until an opening

appears. Refer to gures A and

2. Insert the Loudspeaker hookup cable into the Output Terminal Post opening or the cable spade lug around the center post of

Figu re A

the Output Terminal. Refer to

gure C.

3. Rotate the top of the Output Terminal Post clockwise until it

is nger tight. Refer to gure D.

4. Place the supplied McIntosh Wrench over the top of the Out-

Figu re C

put Terminal and rotate it one

quarter of a turn (90° ) to secure

the Loudspeaker Cable Connection. Do not over tighten. Refer

to gure E.

Loudspeaker Connections:

5. The supplied Loudspeaker Connecting Cables are color coded ends (red and black) to connect between the MXA70 Electronic Chassis Output Terminals to the Input Terminals on the Loudspeakers, being careful to observe the correct polarities.

Note: If the long cables are need, proceed to “Op-

tional Loudspeaker Connections”.

Opening

Figu re B

Figu re D

Figu re E

Optional Loudspeaker Connections

Caution: Do not connect the AC Power Cord to the

MXA70 Rear Panel until after the Loudspeaker Connections are made. Failure to observe this could result in Electric Shock.

Warning: Loudspeaker terminals are hazardous live and

present a risk of electric shock. For additional instruction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical Support.

The McIntosh MXA70 Power Amplifier Circuitry is designed for a single 8 ohms Loudspeaker connected to the Right and Left Output Terminals.

The recommended cable size is shown below:

Cable Distance vs American Wire Gauge (Size)

Loudspeaker

Impedance

8 Ohms

25 feet

(7.62 meters)

or less

16AWG 14AWG 12AWG

1. Prepare the Loudspeaker Hookup Cable for attachment to the MXA70:

Bare wire cable ends: Carefully remove sufficient insulation from the cable ends, refer to figures F, G & H. If the cable is stranded, carefully twist the strands together as tightly as possible.

Notes: 1. If desired, the twisted ends can be tinned

with solder to keep the strands together.

2. The prepared bare wire cable ends may be inserted into spade lug connectors.

3. Banana plugs are for use in the United States and Canada only.

Banana Plugs are for use in the United States and Canada only:

2. Attach the previously prepared bare wire cable ends into the banana plugs and secure the connections. Refer to figure I.

50 feet

(15.24 meters)

or less

Figure F

Figure G

100 fe et

(30. 48 mete rs)

or less

Figure H

Page 11

Connecting Components

3. Rotate the Output Terminal Post clockwise until it is nger tight. Refer to gure J. Then using the McIntosh Wrench, rotate the top of the Output Terminal one quarter of a

Figure I

turn (90° ). Do not over tighten. Refer to gure E.

4. Referring to figure K, connect the

Loudspeaker hookup cables with banana plugs into the hole at the top of the

Figure J

terminal to the MXA70 Negative Output Terminal and Positive Output Terminal to the Loudspeaker

Figure K

Terminal Connections being careful to observe the correct polarities.

Refer to “General Information” Note 7 on page 4 for additional information.

5. Connect the MXA70 power cord to an active AC outlet.

Spade Lug or Wire Connections:

6. Connect the Loudspeaker hookup cables between to the MXA70 Output Terminals and Loudspeaker Input Terminals for both channels. Be careful to observe the correct polarities (Positive and Negative) at both of the cables. Insert the spade lug connector or prepared section of the cable end into the terminal side access hole, and tighten the terminal cap until the cable is firmly clamped into the terminals so the lugs or wire cannot slip out. Refer to figures L and M. Refer to “General Information” Note 7 on page 4 for additional informa-

Figure L

Figure M

tion.

7. Connect the MXA70 power cord to an active AC outlet.

Computer

Black

Red

Connect to AC Outlet

Tuner

Left LoudspeakerRight Loudspeaker

Red

Black

Disc Player

Page 12

System Thru Connections

The MXA70 can also be part of an existing Audio or Audio/Video Sound System. The MXA70 allows connection of Headphones for private listening. It can also drive Loudspeakers in a second room. The MXA70 becomes active when the Main Preamplifier or Audio/ Video Controller is On. In the example below, the MXA70 will go On/Off when the OUTPUT 2 function of the Preamplifier is activated using the Power Control 2 connections.

1. Connect Audio Cables from the Preamplifier OUTPUT 2 jacks to the MXA70 Analog Audio UNBAL jacks.

Note: The Preamplifier Balanced OUTPUT 2 connect-

ed to the MXA70 BALANCED Input may be used instead of the unbalanced connections.

2. Connect a Control Cable from the Preamplifier POWER CONTROL OUTPUT 2 jack to the

MXA70 PWR CTRL (Power Control) IN Jack.

For additional operational information when using the System Thru Connection with the MXA70 and Main Preamplifier or Audio/Video Controller, refer to “System Thru Operation” on page 26

System Thru Connections

Preamplier

Page 13

External Power Amplifier Connections

The MXA70 has the ability to drive an External Power Amplifier. In the example below, the MXA70 automatically switches the External Power Amplifier On/ Off via Power Control function.

1. Connect Audio Cables from the MXA70 PREAMPlifier OUTPUT jacks to the External Power

Amplifier IN (Left and Right) jacks.

2. Connect a Control Cable from the MXA70 PWR CNTRL (Power Control) OUT jack to the External Power Amplifier Power Control IN Jack.

3. Refer to page 10 for connecting other

component(s) to the MXA70.

4. Refer to the External Power Amplifier Owner’s Manual for connection of Loudspeakers.

External Power Amplifier Connections

Power Amplier

Page 14

Remote Control Push-Buttons

Adjusts or Selects the active TRIM function also manually tune down the dial with contemporary McIntosh Tuners

Press to activate TRIM Mode

Scrolls through TRIM Functions

Decreases the volume level

Selects the desired INPUT

Directional Push-buttons Up, Down, Left and Right

Adjusts or Selects the active TRIM function also manually tune up the dial with contemporary McIntosh Tuners

Scrolls through TRIM Functions

Increases the volume level

LED illuminates during the time a remote command is sent to the MXA70

Powers the MXA70 ON or OFFMutes and unmutes the audio

Selects the PREVIOUS 9 Station Preset on contemporary McIntosh Tun e r s

Note: Push-buttons whose function is not identified above are for use with other McIntosh Products.

Selects the NEXT : Station Preset on contemporary McIntosh Tuners

Page 15

How to use the Remote Control

The supplied Remote Control performs the various Operating Functions for the MXA70 Integrated Audio System.

Note: Refer to the “How to Operate” Section of this

manual for additional information.

Input Source Selection

Press the Push-button → to select the desired program

source.

Volume

Press the + or - Push-buttons to increase or decrease the listening level.

Mute

Press the (Mute) Push-button to mute the audio and

a second time to resume listening.

Select Push-Button

Press the Select Push-button to activate the TRIM Mode. Then use the Directional Push-Buttons to select a Trim Mode Function and make changes.

How to use the Remote Control

Back and Next

When using an optional contemporary McIntosh Tuner with the MXA70, select the next Station Preset by press the : Push-button. Select the previous Station Preset by pressing the 9 Push-button.

Directional Push-Buttons

After having pressed the SELECT Push-button,

press the ◄ ► (Left or Right) Push-buttons to scroll

through the various Trim Functions. Then press the

▲ ▼ (Up or Down) Push-buttons to make a change to

the current Trim Setting.

Note: If a contemporary McIntosh Tuner is used with

the MXA70 the ▲ ▼ (Up or Down) on the Remote Control will allow for manual tuning of stations. Refer to “General Information, note 6” on page 4 for additional information.

Page 16

LED indicates when the Left Channel Amplifier POWER GUARD circuit activates

LED indicates when the Right Channel Amplifier POWER GUARD circuit activates

INPUT Control allows the selection of sources for listening and to select different Setup Functions. Also used to activate the Trim and Setup Modes.

Meter indicates the Left Channel Output of the amplifier

IR Sensor receives commands from a Remote Control

Meter indicates the Right Channel Output of the amplifier

VOLUME Control allows adjustment of the listening level for both channels. Also used to activate the HXD and Profiles Modes along with selecting a given Profile.

OUTPUT Control allows the selection of either Headphones (various impedances) or Loudspeakers. When in Setup Mode used for changing the various function settings.

Connection for dynamic type headphones, for private listening

Indicates the Dynamic Crossfield circuitry is active when illuminated

INFORMATION DISPLAY indicates the Sources, Volume, other Audio Settings, Operational Functions and Setup Mode Settings

STANDBY/ON Push-button with indicator switches the MXA70

ON or OFF (Standby) and resets

the microprocessors

PROFILE Control allows selection of stored Profile Settings and used for various Profile Modes

Page 17

Setup

INPUT: UNBAL

MLI USB Audio

MXA70 V_.__ S/N: _______

How to Operate the Setup Mode

Your McIntosh MXA70 has been factory configured for default operating settings that will allow immediate enjoyment of superb audio without the need for further adjustments. If you wish to make changes to the factory default settings, a Setup Feature is provided to customize the operating settings using the Front Panel Display. Refer to the MXA70 Front Panel Illustration on the previous page while performing an introduction into operating the Setup Mode, follow the steps b elow.

Note: If the MXA70 is currently On, proceed to step

1. Press the STANDBY/ON Push-button on the Front

Panel or press the (Power) Push-button on the

Remote Control to switch On the MXA70. The MXA70 will go through a brief startup intialization with the Front Panel Display indicating the last used input and volume setting. This is followed by the volume setting indication starting at zero and then increasing to the last used volume setting. Refer to figure 1.

3. Now rotate the INPUT CONTROL Clockwise until the Front Panel Display indicates “McIntosh USB AUDIO, V_.__ Firmware”. Refer to figure 3 and to page 18 for additional information.

V_.__

Figu re 3

4. Next, rotate the INPUT CONTROL Clockwise again until the Front Panel Display indicates “SOURCE: UNBAL, NAME: UNBAL” Refer to figure 4.

INPUT: UNBAL

NAME: UNBAL

Figu re 4

5. Rotate the INPUT CONTROL Clockwise again to select other Setup Functions. Refer to pages 18 thru 20.

6. To exit from the Setup Mode, press the INPUT CONTROL and the Front Panel Display will revert back to its normal display. Refer to figure 1.

Default Settings

The Default Settings Chart below indicates the Function Name, Default Setting and the Page Number for additional information.

Default Settings

Function Name Setting Page No.

MXA70

McIntosh USB Audio V_.__ 18

INPUT NAME

(Re-asign Input Names)

SPEAKER MODE SMALL 19

SUBWOOFER MODE DISABLED 19

POWER MODE

(Auto Off)

REMOTE CONTROL ENABLED 20

Note: Setup Mode operations should be performed

in the order they appear in the Setup Menu as they are interactive.

NAME:__________

V_._ _

S/N: _ _ _ _ _ _ _

INPUT:_________

ON 20

20%

Figu re 1

2. Press and hold in the INPUT CONTROL until the Front Panel Display indicates “MXA70 V_.__, S/N: __ _ _ _ _ _”. The information indicated on the Front Panel Display includes the Model Number, Firmware Version and the Serial Number for this unit; see page 18 for additional information. Refer to figure 2.

Figu re 2

Page 18

Firmware Version

INPUT: UNBAL

UNBAL

NAME: MY-PHONE

INPUT: UNBAL

UNBAL

MXA70 V_.__ S/N: _______

Input Renaming

The MXA70 functionality is controlled by internal software that is known as Firmware. The MXA70 has two different Firmwares, one is the “System Firmware” (responsible for the basic operation of the MXA70) and the other known as USB Audio Firmware (responsible for the “USB Connection and Conversion” of a Digital Audio Signal from the Comput-

er). The Version of the Firmwares in the MXA70 can

be identified at any time by utilizing the Setup Mode.

1. Press and hold the INPUT CONTROL until the Front Panel Display indicates “MXA70 V_.__, S/N: __ _ _ _ _ _”. The number after the “V” is the firmware version and the number after the “S/N” is the serial number of the unit. Refer to figure 2.

2. Rotate the INPUT CONTROL Clockwise until the

Figu re 2

Front Panel Display indicates “MLI USB AUDIO, V_ . _ _. The number after the “V” is the USB Audio Firmware version”. Refer to figure 3.

3. To exit from the Setup Mode, press the INPUT

MLI USB Audio V_.__

Figu re 3

CONTROL and the Front Panel Display will revert back to its normal display.

The MXA70 Default Input Names (UNBAL, BALANCED, OPTICAL, COAX and AES/EBU as indi-

cated on the Front Panel Display) can be customized

with a different name up to eight characters long (My

Phone, MCD550, etc.). The available characters for

renaming the input include the following: ! < > * , / _ 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z . In the following example, the UNBAL Input will be renamed to “MY-PHONE”.

1. Press and hold the INPUT CONTROL until the Front Panel Display indicates the Model, Firmware Version and Serial Number. Refer to figure 2. Then rotate the INPUT CONTROL and select the Setup Menu item “INPUT: UNBAL, NAME: UNBAL”. Refer to figure 4.

NAME:

Figu re 4

Note: If the UNBAL Input is not displayed, press the

VOLUME Control repeatedly until it is displayed.

2. Press and hold in the VOLUME Control until the character “U” of the “NAME: UNBAL” starts flashing. Refer to figure 5.

NAME:

Figu re 5

3. Rotate the PROFILE Control until the character “M” appears. Refer to figure 6.

4. Rotate the OUTPUT Control until the character “N” of the “NAME: UNBAL” starts f lashing. Refer to figure 7.

INPUT: UNBAL

NAME: MNBAL

Figu re 6

INPUT: UNBAL

NAME: MNBAL

Figu re 7

5. Rotate the PROFILE Control until the character “Y” appears. Refer to figure 8.

INPUT: UNBAL

NAME: MYBAL

Figu re 8

6. Repeat steps 3 thru 5 until the new name of “MYPHONE” is indicated on the Front Panel Display. Refer to figures 9 thru 11.

INPUT: UNBAL

NAME: MY-AL

Figu re 9

INPUT: UNBAL

NAME: MY-PL

Fig u re 10

INPUT: UNBAL

Fi g u re 11

7. To save the new Input Name press and hold the VOLUME Control until the word SAVED appears momentarily on the Front Panel Display. Refer to figure 12.

Figu re 12

Page 19

Setup, con’t

SUBWOOFER MODE

Record any changes made to the various default Input Names in the following chart for future reference.

8. To exit from the Setup Mode, press the INPUT CONTROL and the Front Panel Display will revert back to its normal display.

Input Renaming

Default Input Name New Input Name

UNBAL

BALANCED

OPTICAL

COAX

AES/EBU

USB

Speaker Size

The MXA70 allows for the connection of Loudspeakers with different performance capabilities. One of the difference in Loudspeaker performance is the ability to reproduce bass frequencies down to 35Hz within

-3dB of the midrange frequencies. The MXA70 provides two different settings,

SMALL and LARGE. When using the MXA70 Loudspeakers, use the default setting of SMALL. The LARGE listing refers to the Loudspeaker’s capability for reproducing bass frequencies down to 35Hz within

-3dB of the midrange frequencies. If a Loudspeaker

can not reproduce bass frequencies down to 35Hz within -3dB of the midrange frequencies, it is considered SMALL. In the following example, the Speaker Size default setting of SMALL will be changed to LARGE:

1. Press and hold the INPUT CONTROL until the Front Panel Display indicates the Model, Firmware Version and Serial Number. Refer to figure

2. Then rotate the INPUT CONTROL and select the Setup Menu item “SPEAK ER MODE, Small”.

Refer to figure 13.

SPEAKER SIZE Small

Figure 13

2. Rotate the OUTPUT Control until the Front Panel Display indicates “SPEAKER MODE, Large”. Refer to figure 14.

SPEAKER SIZE Large

Figure 14

3. To exit from the Setup Mode, press the INPUT CONTROL and the Front Panel Display will revert back to its normal display.

Subwoofer Mode

The MXA70 is designed to work with an external Powered Subwoofer. The subwoofer would be used when the Loudspeakers connected to MXA70 Output Terminals do not have the ability to reproduce bass frequencies down to 35Hz (within -3dB of the mid-

range frequencies).

The MXA70 provides two different Subwoofer

Mode settings, “Disabled” and “Enabled”. The Default Setting of “Disabled” provides a Stereo Signal at the PREAMPlifier OUPUT Jacks. When the setting is chanaged to “Enabled” the Left and Right channel signals are combined into a monaural signal available at both PREAMP OUPUT Jacks. In the following example, the Subwoofer Mode default setting of DISABLED will be changed to Enable:

Refer to figure 15.

Disabled

Fig ure 15

2. Rotate the OUTPUT Control until the Front PanelDisplay indicates “SUBWOOFER MODE, Enabled”. Refer to figure 16.

Enabled

Figure 16

Note: When the MXA70 Subwoofer Mode is set

to “ENABLED” it is important the Powered Subwoofer internal crossover frequency be set to 80Hz. It is recommended the Professionals at your McIntosh Dealer, who are skilled in all aspects of room acoustics be involved when the MXA70 is used with a Powered Subwoofer and any associated audio equipment.

3. To exit from the Setup Mode, press the INPUT CONTROL and the Front Panel Display will revert back to its normal display.

Power Mode

The MXA70 incorporates an Auto Off Feature, which automatically places the preamplifier into the Power Saving Standby/Off Mode. This occurs approximately 30 minutes after there has been an absence of audible audio signals on the selected input (on either chan-

nel) or user activity (includes changes to any of the

Operation Functions such as source selection, volume

adjustment, etc). If it is desirable to disable the Auto

Off Feature perform the following steps:

1. Press and hold the INPUT CONTROL until the Front Panel Display indicates the Setup Mode is

Page 20

Power Mode, con’t

Auto Off: Off

REMOTE CONTROL

Setup, con’t

active. Then rotate the INPUT CONTROL until the Setup Menu item “POWER MODE, Auto Off: On” appears on the Front Panel Display. Refer to f i g u r e 17.

POWER MODE Auto Off: On

Fig u r e 17

2. Rotate the OUTPUT Control until “POWER MODE, Auto Off: Off” appears on the Front Panel Display. Refer to figure 18.

POWER MODE

Figure 18

3. To exit from the Setup Mode, press the INPUT CONTROL and the Front Panel Display will revert back to its normal display.

Remote Control

The Front Panel IR Sensor used for Remote Control Operation can be disabled in the event there is a conflict with another McIntosh component located in the same room as the MXA70. Refer to “General Information, note 6” on page 4 for additional information. Disable the Front Panel IR Sensor by performing the following steps:

1. Press and hold the INPUT CONTROL until the Front Panel Display indicates the Model, Firmware Version and Serial Number. Then rotate the INPUT CONTROL and select the Setup Menu item “REMOTE CONTROL, Enabled”. Refer to figure

19.

2. Rotate the OUTPUT Control until the Front PanelDisplay indicates “REMOTE CONTROL, Disabled”. Refer to figure 20.

Disabled

Figu re 20

3. To exit from the Setup Mode, press the INPUT CONTROL and the Front Panel Display will revert back to its normal display.

REMOTE CONTROL Enabled

Figure 19

Page 21

How to Operate the MXA70

BASS BOOST

How to Operate the MXA70

Power On and Off

The Red LED beside the STANDBY/ON Push-button lights to indicate the MXA70 is in Standby mode. To switch ON the MXA70, press the STANDBY/ON

Push-button on the Front Panel or press the (Power)

Push-button on the Remote Control. The MXA70 will go through a brief startup initialization, with the Front Panel Display indicating the last used input and volume setting. This is followed by the volume setting indication starting at zero and then increasing to the last used volume setting. Refer to figures 50, 51 and

52. To switch OFF the MXA70, press the STANDBY/ ON Push-button on the Front Panel or the OFF Pushbutton on the Remote Control.

INPUT: UNBAL 20%

Fig ure 51

Note: For an explanation of the Remote Control

Push-button functions, refer to pages 14 and 15.

Source Selection

Rotate the INPUT Control to select the desired input

or press the appropriate push-button on the Remote Control. Refer to figures 50 and 53.

Volume Control

Rotate the Front Panel VOLUME Control or use the Up (+) or Down (-) Push-buttons on the Remote Control for the desired listening level. Refer to figures 50 and 52.

Trim Functions Introduction

The MXA70 has various Trim Selections with Adjustments. The Trim Functions include Bass Boost,

Balance, Level (Input Trim), Mono/Stereo, Meter Backlight, Display (Information) and Digital Audio (Display Information). The Bass Boost, Balance, Level (Input Trim), Mono/Stereo, Trim Settings are stored

in memory independently for each Input Selected, the other Trim Settings are the same for all inputs.

The selection and adjustment of all Trim Functions

may be performed by first Momentarily pressing the Front Panel INPUT Control. Then rotate the INPUT Control to select the desired Trim Function. This is followed by rotating the OUTPUT Control to make a

change/adjustment in the Trim Setting. To verify a TRIM Setting without changing it, press the INPUT Control and then Rotate the INPUT Control to select the desired Trim Function. After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

BASS BOOST The Intensity of the Low Frequencies in the music can be increased by us-

Figure 52

ing the Bass Boost Trim Function. To make an adjustment perform the following:

1. Momentarily press the Front Panel INPUT Control to enter the TRIM Mode. Then rotate the INPUT Control until “BASS BOOST _ dB” appears on the Front Panel Display. Refer to figure 53.

0dB

Figure 53

2. Rotate the OUTPUT Control to change the Bass Boost, the range of adjustment is from 0dB to +12.5 dB in 2.5 dB steps. Refer to figure 54.

BASS BOOST +2.5dB

Figu re 54

Figu re 50

Page 22

How to Operate the MXA70, con’t

- || +

- ||||||||||||||||| +

- |||||||||||||||| +

|||||||| +

After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

BALANCE The Channel Balance while listening can vary with different program sources. When using Loudspeakers the room acoustics and listening positions also can effect the Channel Balance. Use the Balance Trim Function as needed to achieve approximately equal listening volume levels in each channel. To adjust the Balance perform the following:

1. Momentarily press the Front Panel INPUT Control to enter the TRIM Mode. Then rotate the INPUT Control until “BALANCE: _ dB” appears on the Front Panel Display. Refer to figure 55.

BALANCE: 0 dB < || >

Fig ure 55

2. Rotate the OUTPUT Control to change the Channel Balance, the range of adjustment is 60dB (to

emphasize the Left or Right Channel) in 1 dB

steps. Refer to figures 56 and 57.

BALANCE: 60 dB < |||||||||||||||||| >

Figu re 56

BALANCE: 60 dB < |||||||||||||||||||| >

Figure 57

After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

TRIM LEVEL Source Components can have slightly different volume levels resulting in the need to readjust the MXA70 Volume Control when switching between different Inputs. The MXA70 allows the adjustment of levels for each of the Inputs for the desired same relative volume. The UNBAL and OPTICAL Inputs are used in the following example.

Note: The TRIM Level Adjustments made are retained in

permanent memory.

1. Rotate the INPUT Control to select the UNBAL Input and adjust the VOLUME Control for the desired listening level.

2. Momentarily press the Front Panel INPUT

Control to enter the TRIM Mode. Then rotate the INPUT Control until “LEVEL: _. _ dB” appears on the Front Panel Display. Rotate the OUTPUT Control until the Front Panel Display indicates “ LEVEL: 0.0dB”. Refer to fig ure 58.

LEVEL: 0.0 dB

Figu re 58

The range of TRIM Adjustment is ± 6dB. Refer to figures 59 and 60.

LEVEL: -6.0 dB

Figure 59

LEVEL: 6.0 dB

Figure 60

Note: The UNBAL Input is serving as a refer-

ence level or choose another Input frequently listened to.

3. Note the current listening level. Then rotate INPUT Control to select the OPTICAL Input and note if the relative volume is louder or quieter than the volume level of the UNBAL.

4. Momentarily press the Front Panel INPUT

Control to enter the TRIM Mode. Then rotate the INPUT Control until “LEVEL: _. _ dB” appears on the Front Panel Display. Using the OUTPUT Control adjust the TRIM Level to match the same relative volume level heard when listening to the UNBAL Input.

5. In our example the relative volume level of the

OPTICAL Input is louder than the UNBAL Input, so the trim level for the OPTICAL Input is reduced to -2.5 dB. Refer to figure 61.

LEVEL: -2.5 dB

Fig ure 61

6. Repeat steps 1 thru 4 until the relative volume

is the same between the UNBAL and OPTICAL Inputs.

7. Repeat the above steps for the remaining inputs with component sources connected until they all have the same relative volume levels. Record any changes made to the various inputs from the default settings in the “Input Trim Settings” Chart on the next page.

After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

MONO/STEREO MODE By default the Stereo Mode is active for all Input Sources however, any Input Source may be assigned to Mono Mode. To change Stereo Mode to Mono for a given Input Source, perform the following steps:

Page 23

How to Operate the MXA70

MONO / STEREO

DISPLAY

Off

1. Momentarily press the Front Panel INPUT Control to enter the TRIM Mode. Then rotate the INPUT Control until “MONO / STEREO” appears on the Front Panel Display. Refer to figure 62.

Stereo

Figu re 62

2. Rotate the OUTPUT Control to change the Mode to “Mono”. Refer to figure 63.

MONO / STEREO Mono

Figu re 63

After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

Input Trim Settings

Connection Type Input Name New Trim Level

UNBAL

BALANCED

OPTICAL

COAX

AES/EBU

USB

METER BACKLIGHT The MXA70 Front Panel Meter Illumination may be switched On or Off by performing the following:

1. Momentarily press the Front Panel INPUT Control to enter the TRIM Mode. Then rotate the INPUT Control until “METER BACKLIGHT” appears on the Front Panel Display. Refer to figure 64.

2. Rotate the OUTPUT Control to change illumination to “Off”. Refer to figure 65.

METER BACKLIGHT On/Auto

Figu re 64

METER BACKLIGHT Off

Figu re 65

After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

Note: Meter Illumination of contemporary McIntosh

Power Amplifiers will also switch On/Off when connected to the MXA70 via a power control cable. Refer to “Power Control Connections”

on page 4.

DI SPLAY The MXA70 Front Panel Dispaly Illumination may be switched On or Off by performing the following:

1. Momentarily press the Front Panel INPUT Control to enter the TRIM Mode. Then rotate the INPUT Control until “DISPLAY” appears on the Front Panel Display. Refer to figure 66.

2. Rotate the OUTPUT Control to change the Display to “Off”. Refer to figure 67.

After approximately 5 seconds the Display will switch Off. Any Front Panel Control Operation (or Remote

Control Operation such as Input Selection) and the

Figu re 66

Off

Figu re 67

Display will switch On to indicate current status. Then approximately 5 seconds later the Display will switch Off.

DIGITAL AUDIO By default, the Digital Audio Display is switched On to display information about the type of digital signal present when a digital input is selected. To switch Off Digital Audio Display perform the following steps:

1. Momentarily press the Front Panel INPUT Control to enter the TRIM Mode. Then rotate the INPUT Control until “DISPLAY” appears on the Front Panel Display. Refer to figure 68.

DIGITAL AUDIO Disp Info:

Figu re 68

2. Rotate the OUTPUT Control to change the Display to “Off”. Refer to figure 69.

DIGITAL AUDIO Disp Info:

Figu re 69

After approximately 5 seconds the Display returns to indicate the Input Selection and Volume Level.

Mute

Press the MUTE Push-button on the Remote Control to Mute the Audio in the Headphones, Loudspeakers and PRE AMP OUTPUT Jacks. The Front Panel Display will indicate the Input Name and with the word MUTE in place of the actual volume setting. Refer to figure 70.

INPUT: UNBAL MUTE

Figu re 70

Page 24

How to Operate the MXA70, con’t

To un-MUTE the Audio press the MUTE Pushbutton on the Remote Control, adjust the Volume level or change Inputs.

Headphones Jack

Connect a pair of dynamic headphones to the Head-

phones Jack with a 1/4” (6.3mm) stereo phone type

plug for private listening.

Note: Use the OUTPUT Control to select the correct

impedance range.

Headphone HXD

The MXA70 Headphone Crossfeed Director (HXD

)

improves the sound localization for Headphone Lis-

tening. HXD of the spatial sound stage normally heard with Loudspeaker listening. To activate the HXD when Headphones are connected to the Front Panel Headphone Jack perform the following:

1. Momentarily press the Front Panel VOLUME Control to enable the HXD Mode. The HXD Icon located above the Headphone Jack will illuminate Green. Refer to figure

71.

2. To disable the HXD Mode momentarily press the Front Panel VOLUME Control.

Note: HXD TMMode is automatically

restores the directionality component

disabled when SPEAKERS are selected with the OUTPUT Control.

Figure 71

Output Control

Rotate the OUTPUT Control to select the desired listening device, Headphones or Loudspeakers. Refer to the OUTPUT CONTROL SELECTION chart below:

Notes: 1. For the best performance and safety, it is im-

portant to always match the impedance of the Headphones and Loudspeakers to the MXA70 Output.

2. Do not exceed the maximum power handling capacity of Headphones or Loudspeakers connected to the MXA70.

3. The first time the OUTPUT Control is rotated the Front Panel Display will indicate the current Output selection.

OUTPUT CONTROL SELECTION

Listening

Device

Loudspeakers 8 ohms --- 50 Watts 71

Headphones 8 to 40 ohms Norm 25 0 mWat t s 72

Headphones 40 to 150 ohms Norm 250 mWat t s 73

Headphones 150 to 600 ohms Norm 25 0 mWat t s 74

Headphones 8 to 40 ohms High 1 Wat t 75

Headphones 40 to 150 ohms High 1 Watts 76

Headphones 150 to 600 ohms High 1 Wat t 77

Impedance

Power Level

Output

Refer to figure No.

Profile Mode

The MXA70 has the ability to store up to 5 different Profile Settings for Headphone use. Each profile setting stores the selected Headphone Impedance

Range, HXD Setting (On or Off), Bass Boost Setting (0 to +12.5 dB) and asign a custom name for it. In the

following example a Profile will be created, recalled, renamed and finally deleted using the Profile Setup Mode: PROFILE SETTINGS

1. Using the OUTPUT Control select, from the six

INPUT: UNBAL

SPEAKER

Figu re 72

INPUT: UNBAL NORM 8O -

Figu re 73

40O

INPUT: UNBAL NORM 40O -

Fig u re 74

150O

INPUT: UNBAL NORM 150O -

Fig u re 75

600O

INPUT: UNBAL HIGH 8O -

Figure 76

40O

INPUT: UNBAL HIGH 40O -

Figu re 77

150O

INPUT: UNBAL HIGH 150O -

Figu re 78

600O

Page 25

How to Operate the MXA70, con’t

NO PROFILE SAVED

Profile Saved

NAME PROFILE

choices available, the correct impedance and power output for the Headphones that will be used for listening. Refer to figures 72 thru 78.

2. If desired, select the HXDTM Mode by momentarily press the the VOLUME Control. The HXD Icon located above the Headphone Jack will illuminate Green. Refer to figure 71.

3. If desired, select the amount of TRIM Bass Boost by momentarily pressing the INPUT Control. Then rotate the INPUT Control to select BASS BOOST followed by using the OUTPUT Controlfor the desired increase. Refer to figures 53 and 54 on page 21.

CREATE A PROFILE With the Impedance/Power, HXD and Bass Boost settings made, they will now be assigned to Profile1, for easy recall at a later time. The PROFILE and VOLUME Controls are used to perform the various Profile

Functions (Save, Select Rename and Delete). When

the PROFILE Control is rotated and there are no saved Profiles the Front Panel Display will indicate.the currently selected Input and “NO PROFILE SAVED”. Refer to figure 79.

INPUT: UNBAL

Figu re 79

Create new Profile1 by following the below steps:

4. Press and hold in the VOLUME CONTROL until the Front Panel Display indicates “SAVE PROFILE, Profile1”. Refer to figure 80.

SAVE PROFILE Profile1

Figu re 80

5. To store “Profile 1” into memory press and hold in

the VOLUME CONTROL until the Front Panel Display indicated “SAVE PROFILE, Profile Saved”. Refer to figure 81.

SAVE PROFILE

Fig u r e 81

6. To exit the Profile Setup Mode momentarily press the VOLUME Control.

To select a previously saved Profile perform the follwing steps:

7. Rotate the PROFILE Control to select from the available Profiles stored in memory. Refer to figure 82.

INPUT: UNBAL Profile1

Figu re 82

Note: The first time the PROFILE Control is

rotated, the Front Panel Display will indicate the current Profile selection. Refer to figure 83.

INPUT: UNBAL PROFILE NOT SET

Figu re 83

RENAMING A PROFILE The MXA70 Profile Name (Profile1 thru Profile5 as indicated on the Front Panel Display) can be customized with a different name up to eight characters long (Y10-PRO, etc.). The available characters for renaming the input include the following: ! < > * , / - _ 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X Y Z . In this example the previously created and saved Profile1 will be renamed to “Y10-PRO” by performing the follwing steps:

8. Refering to figure 84, rotate the PROFILE Control to select “NAME PROFILE, Profile1”.

Profile1

Figu re 84

9. Press and hold the VOLUME Control until the the character “P” of the “Profile1” starts flashing. Refer to figure 85.

Profile1

Figu re 85

11. Rotate the PROFILE Control until the character “Y” appears . Then Rotate the OUTPUT Control until the character “r” of the “Yrofile1” starts flashing. Refer to figure 86.

Yrofile1

Figu re 86

12. Rotate the PROFILE Control until the character “1” appears. Then rotate the OUTPUT until the character “o” of the “Y1ofile1” starts flashing. Refer to figure 87.

NAME PROFILE Y1ofile1

Figu re 87

13. Repeat steps 9 thru 12 until the new name of “Y10-PRO” is indicated on the Front Panel Display. Refer to figure 88.

NAME PROFILE Y10-PRO

Figu re 88

Page 26

How to Operate the MXA70, con’t

Profile Saved

INPUT: UNBAL

Deleted

Profile Mode, con’t

14. To store the renamed Profile into memory press and hold in the VOLUME CONTROL until the Front Panel Display indicated “SAVE PROFILE, Profile Saved”. Refer to figure 81.

SAVE PROFILE

Fig u r e 81

15. To exit the Profile Rename Mode momentarily press the VOLUME Control.

DELETING PROFILES

There are two ways to Delete Profile(s), delete one

saved Profile or delete all saved Profile Names. In the first example one Profile will be deleted. Perform the following steps:

16. Using the Profile Control, select the Profle (1 thru

5) to be deleted. Refer to figure 82.

Profile1

Figu re 82

17. Rotate the Profle Control to select “DELETE PROFILE1”. Refer to figure 89.

DELETE PROFILE

Profile1

Figu re 89

18. Press and hold in the VOLUME CONTROL until the Front Panel Display indicates “DELETE PROFILE, Profile Deleted”. Refer to figure 90.

To Delete All the stored Profiles, perform the following steps:

20. Using the Profile Control, select one of the

availble Profiles (1 thru 5). Refer to figure 91.

INPUT: UNBAL Y10-PRO

Fig ure 91

21. Rotate the Profle Control to select “DELETE ALL, Saved Profiles”. Refer to figure 92.

DELETE ALL Saved Profile

Figu re 92

22. Press and hold in the VOLUME CONTROL until

the Front Panel Display indicates “DELETE ALL, All Deleted”. Refer to figure 93.

DELETE ALL

All Deleted

Figu re 93

23. To exit the Profile Delete Mode momentarily

press the VOLUME Control.

Power Output Meters

The MXA70 Power Output Meters indicate the power delivered to the Loudspeakers or Headphonese. Refer to figure 100. The meters respond to all the musical

information being produced by the Amplifier. They indicate to an accuracy of at least 95% of the power output with only a single cycle of a 2,000Hz tone burst.

Power Guard

During normal operation, the Front Panel Power Guard Indicators will momentarily illuminate during peaks in the audio signals. In the event the MXA70 over heats, due to improper ventilation, high ambient temperature and/or impedance mismatch, the internal protection circuits will activate. The Front Panel Power Guard Indicators will continuously illuminate and the audio will be muted. When the MXA70 has returned to a safe operating temperature, normal operation will resume.

Using a Separate Power Amplifier or Subwoofer

To use a separate amplifier instead of the MXA70 built-in Power Amplifier, connect the Loudspeakers to the separate power amplifier. Refer to page 13 “External Power Amplifier Connections” for addition connection information. An external Powered Subwoofer may also be used with the MXA70. Refer to page19 “Subwoofer Mode” for additional information. When either an External Power Amplifier or Power Subwoofer is used with the MXA70 the Rear Panel PREAMP

Fig u re 101

OUTPUT Jacks are used. Refer to figure 101.

DELETE PROFILE Profile

19. To exit the Profile Delete Mode momentarily press the VOLUME Control.

Figu re 90

Fig u re 10 0

System Thru Operation

When the MXA70 is connected to a Main Preamplifier or Audio/Video Controller (as illustrated on

page 12) it is important to maximize the combined

Page 27

How to Operate the MXA70, con’t

30% 48K

performance. For the best performance, the volume control on the MXA70 should be set to 70%. The Volume Control on the Main Preamplifier or Audio/ Video Controller should be used to adjust the listening volume level.

Digital Inputs

When a Digital Input (Optical, Coax or AES/EBU

Connection) on the MXA70 is selected the Front Panel

Display will indicate the Sampling Frequency when a signal is present “48K”. Refer to figure 102. During the time there is no Digital Signal present the display will indicate “SILENT”. Refer to figure 103.

INPUT: OPTICAL

Fig u re 102

INPUT: COAX 30%

USB Input Operation and Driver Installation

The MXA70 USB Input provides the capability to playback music from a computer when the MXA70 Rear Panel USB Connector is connected to a computer USB Connector. Refer to page 11 Connecting Components.

Note: The USB Input is for direct connection to a com-

puter only. To playback music from a USB Drive, connect the USB Drive to another USB Port on the computer and select the USB Drive with the Media Playback Program.

The MXA70 USB Input is compatible with PC

Computers using Microsoft® Windows® Vista (SP2), Windows 7 (SP1) and Windows 8 (SP1). It is also com-

patible with Apple® Macintosh® Computers using

SILENT

Figure 103

OS-10.9 Mavericks or later.

When using a PC Computer with Windows, a special McIntosh USB Audio Software Driver needs to be installed on the PC Computer. The driver needs to be installed before connecting the MXA70 USB Input to the USB Port on the computer.

Note: If an Apple Macintosh computer is used with the

MXA70, no additional driver is required.

The McIntosh USB Audio Windows Driver is available for download from the McIntosh Web Site:

http://www.mcintoshlabs.com/us/support/Pages/

Manuals.aspx

Under “Products” select “McIntosh MXA70” then scroll down to the bottom of the McIntosh MXA70 to the “DOWNLOAD AREA”. Select the “McIntosh MXA70 PC DRIVER SETUP” and download the PC Windows Driver. Follow the instructions below to install the McIntosh MXA70 Driver:

Purpose:

To Install the McIntosh USB Audio Windows Driver for use with McIntosh MXA70 with an USB-Digital Audio Input.

Requirements:

1. A functioning McIntosh MXA70

with an USB-Digital Audio Input.

2. A PC Computer with a genuine Intel Main Processor and a functioning USB Port.

3. Windows Vista (SP2), Windows 7 (SP1 or greater) or Windows

8.1 Operating System.

4. An USB Cable with Type A to

Type B Connectors.

Installing the Software

It is important to first install the downloaded software on your computer before connecting the McIntosh MXA70 to the computer. The USB Driver is included in the downloaded software package.

Note: Before installing this software, please check to see

if the McIntosh MXA70 has the latest firmware version, if not update the firmware first.

1. Unzip the downloaded McIntosh Windows USB Driver Software Package.

2. Run “McIntosh_USB_driver_._.exe”. Refer to fig- ures 104 and 105.

Fig u re 10 4

Fig u re 105

3. Referring to figure 106, read and then check the

“I accept the terms of the License Agrement” box and

then the Next > button. If desired, choose a Start Menu Folder. Refer to figure 107.

Fig u re 10 6

Fig u re 107

4. When the Windows Security window appears click on the “Install” button. Refer to figures 108 thru 111 on the next page.

Page 28

Fig u re 10 8

Fi g u r e 110

Figure 109

Fi g u r e 111

USB Connection

Connect the USB Cable with Type A to Type B connectors between the PC Computer and the McIntosh MXA70 with the USB-Digital Audio Input. An Icon will appear On-Screen indicating Windows has found new hardware. Refer to figure 112. Referring to figure

Fi g u re 11 2

113, check the

Always trust software from “CEntrance, Inc.”

box and then the Install button. Upon completion of installing the

Fi g u r e 113

driver, figure 114 will appear.

Fi g u re 114

Windows Sound Settings

For proper operation of the McIntosh MXA70 via the Computer USB Connection, it is required to make changes to Windows Sound Settings:

1. Click on the “McIntosh ICON” (located in the Windows notification area on the right side of the

taskbar) or click on the Windows “Show hidden

icons”, then select the “McIntosh ICON”. Refer to figures 115, 116 and 117.

Fi g u re 115

Fi g u re 116

Fi g u re 117

Note: Some version(s) of Windows might not show

the McIntosh Icon. Click on the “Start” button, select “Control Panel”, then “Sound”.

Proceed to step 3.

2. Right mouse button click to bring up the menu

and then select the “Sound and Audio....”. Refer

to figures 118 and 1119.

3. Select the “Speakers McIntosh USB Audio” and then click on the SET DEFAULT button. Refer to figures 120 and 121.

Fi g u re 118

Fi g u re 119

Notes: 1. When the McIntosh USB Audio MXA70 is

not connected to your computer, the previous default Audio Device will be selected.

2. If other McIntosh Product(s) with USB Audio Connections are also connected to the computer, an additional “McIntosh USB Audio” playback device will appear in the listing. Make sure to select the “McIntosh USB Audio Device” from available playback devices listed when using this McIntosh MXA70 for USB Audio.

Figu re 120

Page 29

How to Operate the MXA70, con’t

Fig u r e 121

USB Audio Driver Operation

Control Panel Settings

The MXA70 USB Control Panel allows changes to be made from the default settings. These include Latency,

Sample Rate and Audio Stream Input Output (ASIO)

Control. Refer to figure 122.

Note: It is not neces-

sary for the McIntosh USB Control Panel to be running, unless it is desired to make changes to the default

settings.

Figu re 122

LAT E NC Y: The default Latency Setting is chosen for contemporary computers and their performance capabilities. When the McIntosh USB Audio Driver is installed on a legacy computer with slower processing speed, it may occasionally produce clicks/pops in the music. To resolve this if it occurs, increase the Latency Setting

(increase buffer size).

SAMPLE RATE: The Sample Rate pull down Window indicates the Sample Rate choices of the connected McIntosh MXA70. It also communicates the selected choice of Sampling Rate to the active Windows Playback Program.

Note: In general, when the original music is recorded

at a higher Sampling Rate, the result is usually more detail in the music. However, this higher rate results in consuming larger amounts of storage space. The Sample Rate usually should be set to match the Sample Rate of the music recording being played back.

ASIO HOSTS CAN CHANGE: There are two choices. When the box is not checked

(default setting), the Sample Rate is determined by

the Sample Rate Setting in the McIntosh USB Control Panel. It would be an appropriate choice when using a playback program like Windows Media Player.

If a third party program for music playback is ASIO compliant then check the box. These programs allow changing the Sample Rate Setting directly “on the fly” according to the format of the music being played back. An example of just one of the available programs is “JRiver Media Center”.

ABOU T: Displays the Driver Version and Control Panel Version of the current McIntosh USB Audio Driver. Refer to figure 123.

Figu re 123

Reset of Microprocessors

In the unlikely event the controls of the MXA70 stop functioning, the microprocessors can be reset by performing the following:

1. Press the STANDBY/ON Push-button until the STANDBY/ON Indicator switches Off.

2. When the MXA70 cycles On then Off, release the STANDBY/ON Push-button.

3. When the STANDBY/ON LED is illuminated press the STANDBY/ON Push-button, the MXA70 will resume normal operation.

Note: This can be performed with the MXA70 On or

in the Standby Mode.

Resetting the MXA70 to default settings

If it becomes desirable to reset all the adjustable set-

tings (Setup and Trim Settings) to the factory default

values, perform the following:

1. Press in and hold the INPUT Control and the VOLUME Control. The Front Panel Display will indicate “FACTORY RESET”. Refer to figure 124.

Figu re 124

2. When the Front Panel Display indicates “FACTORY RESET, COMPLETE” release the two controls. Refer to figure 125.

Figu re 125

3. Press the STANDBY/ON Push-button and the MXA70 will resume operation.

Page 30

Amplifier Specifications

Loudspeaker Power Output

50 watts is the minimum sine wave continuous average power output per channel, both channels operating

Headphone Power Output

250mWatts - Norm Selection, 1 watt - High Selection

Loudspeaker Output Load Impedance

8 ohms

Headphone Output Load Impedance

8 - 40 ohms, 40 - 150 ohms, 150 - 600 ohms

Rated Power Band

20Hz to 20,000Hz

Total Harmonic Distortion

0.005% maximum with both channels operating from 250 milliwatts to rated power, 20Hz to 20,000Hz

Dynamic Headroom (Loudspeaker)

1.5dB

Frequency Response

+0, -0.5dB from 20Hz to 20,000Hz +0, -3dB from 10Hz to 100,000Hz

Tone Control

Bass Boost 0 to +12.5dB (2.5dB steps) @ 40Hz

Preamplifier Output (for rated input)

3V (8V Maximun)

Signal To Noise Ratio (A-Weighted)

High Level, 105dB below rated output

Input Impedance

25K ohms unbalanced and balanced

Maximum Input Signal

8V unbalanced, 16V balanced

Sensitivity (for rated output)

300mV unbalanced, 600mV balanced

Intermodulation Distortion

0.005% maximum, if the instantaneous peak power is 100 watts or less per channel with both channels operating for any combination of frequencies from 20Hz to 20,000Hz

Wide Band Damping Factor

Greater than 150

Preamplifier Output Impedance

500 ohms

Power Guard

Less than 2% THD with up to 16dB overdrive at 1,000Hz

Voltage Gain

36.5dB

Digital Input Sample Rates

Optical, Coaxial, AES/EBU: 16Bit, 24Bit - 32 to 192kHz USB: 16Bit, 24Bit, 32Bit - 32kHz to 192kHz

Power Control

Input: 5-15VDC, < 1mA Output: 12VDC, 25mA maximum

Loudspeaker Specifications

System Driver Complement

One 4 inch Woofer/Midrange, One 3/4 inch Tweeter

Impedance

8 ohms Nominal

Amplifier Specifications

Frequency Response

60Hz - 45kHz

Crossover Frequency

2,000Hz

Power Handling

75 Wat ts

Finish Enclosure and Grille High Gloss Black, Black Knit Cloth

General Specifications

Power Requirements

Field AC Voltage conversion of the MXA70 is not possible. The MXA70 is factory configured for one of the following AC Voltages:

100 Volts, 50/60Hz at 1.8 amps 110 Volts, 120 Volts, 50/60Hz at 1.5 amps 220 Volts, 50/60Hz at 0.9 amps 230 Volts, 240 Volts, 50/60Hz at 0.8 amps Standby: Less than 0.25 watt

Note: Refer to the rear panel of the MXA70 for the cor-

rect voltage.

Overall Dimensions

Width is 23-1/4 inches (59.1cm) Height is 10-7/8 inches (27.6cm) including feet Depth is 19 inches (48.3cm) including the Front Panel,

Knobs and Cables

Weig ht

50 pounds (22.6 kg) net, 66 pounds (29.9 kg) in shipping

carton

Shipping Carton Dimensions

Width is 35 inches (88.9cm) Depth is 20 inches (50.8cm) Height is 15-1/2 inches (39.4cm)

Page 31

Packing Instructions

In the event it is necessary to repack the equipment for shipment, the equipment must be packed exactly as shown below. It is very important that the four plastic feet are attached to the bottom of the equipment. Failure to do this will result in shipping damage. Use the original shipping carton and interior parts only if they are all in good serviceable condition. If

a shipping carton or any of the interior part(s) are

needed, please call or write Customer Service Department of McIntosh Laboratory. Refer to page 3. Please see the Part List for the correct part numbers.

MXA70 Packing Material List

Quantity Part Number Description

1 034475 Shipping carton 4 034484 Foam Pads 2 034483 Slit Score Wrap

1 034548 Electronic inner carton 1 034558 Left foam end cap 1 034557 Right foam end cap 1 034559 Corrugated wrap

4 163073 Plastic foot 4 400131 #10-32 x 1/2 machine screw

2 310411SP Loudspeaker inner carton 2 310409SP Loudspeaker top foam 2 310410SP Loudspeaker bottom foam

LOUDSPEAKER TOP FOAM PAD

LOUDSPEAKER BOTTOM FOAM PAD

LOUDSPEAKER INNER CARTON

FOAM PAD

SLIT SCORE WRAP

LOUDSPEAKER TOP FOAM PAD

LOUDSPEAKER BOTTOM FOAM PAD

LOUDSPEAKER INNER CARTON

SLIT SCORE WRAP

FOAM PAD

SHIPPING CARTON

FOAM PAD

ACCESSORY PACK

CORRUGATED WRAP

LEFT FOAM END CAP

ELECTRONIC INNER CARTON

Packing Instructions

IMPORTANT

(Read Above)

RIGHT FOAM END CAP

FOAM PAD

ACCESSORY PACK

Page 32

McIntosh Laboratory, Inc.

2 Chambers Street Binghamton, NY 13903 www.mcintoshlabs.com

The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without notice. Printed in the U.S.A.

McIntosh Part No. 04150100