Mcintosh MA352 User Manual

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

MA352

Integrated Amplifier

Owner’s Manual

Important Safety Information is supplied in a separate document “Important Additional Operation Information Guide”

Thank You

Your decision to own this McIntosh MA352 Integrated Amplifier ranks you at the very top among discriminating music listeners. You now have “The Best.” The McIntosh dedication to “Quality,” is assurance that you will receive many years of musical enjoyment from this unit. 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: 6 07-723-3512 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: 6 07-723-3515 Fax: 607-723 -1917

Table of Contents

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

(Separate Sheet) ............................Important Additional

Operation Information Guide

Thank You and Please Take a Moment ...............................2

Technical Assistance and Customer Service .......................2

Table of Contents ................................................................. 2

Important Information ......................................................... 3

Unpacking the MA352......................................................4-5

General Information ............................................................ 6

Connector and Cable Information ....................................... 6

Introduction ......................................................................... 7

Performance Features .......................................................... 7

Dimensions .......................................................................... 8

Installation ........................................................................... 9

Connections:

Rear Panel Connections ..................................................... 10

Connecting Components and Loudspeakers ................ 11-12

MA352 Switch Power On ................................................. 13

Remote Control and Front Panel:

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

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

Front Panel Displays, Controls and Jack ........................... 16

Setup Mode:

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

Setup Functions:

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

Fi r mware Versi o n ...................................................... 17

Source Input On/Off and Renaming .................... 17-18

Output 2, Passthru ..................................................... 19

Data Por t .................................................................... 19

Comm Port Baud Rate ............................................... 20

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

IR Sensor ....................................................................20

Power Mode ...............................................................21

Factory Reset .............................................................21

Operation:

How to Operate the MA352 .........................................22-25

Trim Functions:

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

Equalizer Mode ..........................................................23

Mono/Stereo Mode ....................................................23

Output 1 and 2 ...................................................... 23-24

Tri m Level ..................................................................24

Meter Illumination .....................................................24

Tube Lig ht s ........................................................... 24-25

Information Display Illumination .............................25

Information Display Activity ....................................25

Reset of the Microprocesors .............................................. 25

Specifications and Equalizer Controls .............................. 26

Packing Instructions .......................................................... 27

IMPORTANT!

INSTRUCTIONS FOR REMOVAL

OF FOAM INSERT OVER THE

VACUUM TUBES PRIOR TO

CONNECTING THE A.C. POWER

SUPPLY CORD, START ON THE

NEXT PAGE.

Caution: To prevent damage to the MA352

Tubes during shipping, there is a special foam insert surrounding the Tubes of the Integrated Amplifier.

The Foam Insert must be

removed from the MA352 before connecting the AC Power Supply Cord to the integrated amplifier.

2. Remove the Warning Sheet and save it with the Shipping Carton for possible future use. Refer to figures A and B.

3. Carefully lift upright the Foam Insert Vacuum Tube Cover and place it near to the MA352 Integrated Amplifier. Refer to figure C.

BAL 1 15%

125

2K 10K

500

Failure to do so has the po-

tential of a Fire Hazard, resulting in damage to the MA352 and the surrounding environment.

Follow these instructions for

removal of the packing foam before connecting the AC Power Supply Cord to the MA352.

The MA352 has no user serviceable parts, including the tubes. If repairs are needed they must be performed by an authorized McIntosh Service Agency. Follow the steps below to prepare the MA352 for operation:

1. Orient the MA352 so the Front and Top of the Integrated Amplifier is facing you. Refer to figure A.

WARNING

TO AVOID A FIRE HAZARD, THE FOAM INSERT OVER THE VACUUM TUBES MUST BE REMOVED

V1 - 12AX7A

PRIOR TO CONNECTING THE A.C. MAINS POWER SUPPLY CORD AND OPERATING THIS PRODUCT.

REFER TO PAGE 3 IN THE MA352 OWNER’S

V3 - 12AT7

INPUT

HEADPHONES

PUSH - TRIM

MANUAL FOR INSTRUCTIONS.

30 125 500 2k 10k

Figure A

Remove the Warning Sheet

V1 - 12AX7A

V3 - 12AT7

INPUT

PUSH - TRIM

HEADPHONES

30 125 500 2k 10k

Figure B

Vacuum Tube Shield Covers

V2 - 12AX7A

Figure C

Remove the Foam Insert Vacuum

V4 - 12AT7

VOLUME

STANDBY

PUSH - POWER

4. Remove from the Foam, the four Vacuum Tube

Tube Cover

Shield Covers and place them along the side of the MA352 Integrated Amplifier. Save the Foam Insert Vacuum Tube Cover with the Shipping Carton for possible future use. Refer to figure D.

Remove the four Vacuum Tube Shield Covers

V4 - 12AT7

VOLUME

STANDBY

PUSH - POWER

Figure D

WA R NI NG:

The supplied Vacuum Tube Shield Covers must be installed over each of the four Small Vacuum Tubes before the MA352 Integrated Amplifier is connected to AC Power and activated for use!!

5. The MA352 Integrated Amplifier has four Small Vacuum Tubes that are inserted into special Vacuum Tube Sockets on the Stainless Steel Chassis. Refer to figure E. Each of the Tube Sockets have four pin openings to accept the Vacuum Tube Shield Covers. Refer to figure F. Carefully install the Vacuum Tube Shield Covers into each of the Vacuum Tube Sockets orienting the Shield so the “Mc” on top of the Shield is facing forward. Refer to figures G and H.

V1 - 12AX7A

Unpacking the MA352

V2 - 12AX7A

Failure to do so has the potential to cause physical harm to human beings and animals.

This could also result in damage to the Vacuum Tubes and the MA352 Internal Circuitry.

It also prevents the potential of a Fire Hazard, resulting in damage to the MA352 and the surrounding environment.

V3 - 12AT7

INPUT

HEADPHONES

PUSH - TRIM

Figure E

Pin Openings

V1 - 12AX7A

30 125 500 2k 10k

V2 - 12AX7A

STANDBY

Special Vacuum Tube Sockets

Vacuum Tube Shield Covers

Figure F

PUSH - POWER

V4 - 12AT7

VOLUME

V3 - 12AT7

PUSH - TRIM

V4 - 12AT7

INPUT

HEADPHONES

30 125 500 2k 10k

VOLUME

STANDBY

PUSH - POWER

Figure G

BAL 1 15%

125

2K 10K

500

Figure H

General Information

1. For additional connection information, refer to the owner’s manual(s) for any component(s) connected to the MA352.

2. Apply AC Power to the MA352 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 MA352 includes an Auto Off Power Save Feature and the default setting is enabled. For additional information including how to disable it, refer to page 21.

4. When Power Amplifier Protection Circuitry of the MA352 has activated, the Vacuum Tubes LEDs are illuminated continuously with the color orange and the sound will be muted.

5. When the Power Transformer has overheated due to improper ventilation and/or high ambient operating temperature, AC Power is removed from the MA352. Normal operation will resume when the operating temperature is in a safe range again.

6. The MA352 Remote Control is capable of operating other components. For additional information go to www.mcintoshlabs.com.

7. The IR Input, with a 3.5mm mini phone jack, is configured for non-McIntosh IR sensors such as a Xantech Model HL85BK Kit. Use a Connection Block such as a Xantech Model ZC21 when two or more IR sensors need to be connected to the MA352. The signal from a connected External IR Sensor will have priority over the signal from the Front Panel IR Sensor.

General Information, Connector and Cable Information

8. 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.

9. For additional information on the MA352 and other McIntosh Products please visit the McIntosh Website at www.mcintoshlabs.com.

Connector and Cable Information

XLR Connectors

Below is the Pin configuration for the XLR Balanced Input Connectors on the MA352. Refer to the diagram for connection: PIN 1: Shield/Ground PIN 2: + Output

PIN 1

PIN 3: - Output

Power Control Connector

The Power Control Output Jack sends Power On/ Off Signals (+12 volt/0 volt) when another McIntosh Component is connected. A 3.5mm stereo mini phone plug is used for connection to the Power Control Output.

Data Port Connector

The Data Out Ports send Remote Control Signals to Source Components. A 3.5mm stereo mini phone plug is used for connection.

PIN 3

Power Control

Data Signal

PIN 2

N/C

Ground

N/C

Data Ground

RS232 Data Port Cable

The RS232 Data Cable is a

3.5mm stereo mini phone plug for use with a compatible control system.

Data In (DB9-pin2)

Data Out (DB9-pin3)

Output Terminal Connector

When cables with spade lugs are used for Loudspeaker Connection, the spade lugs need an opening of at least 3/10 inch (7. 6 mm).

Ground (DB9-pin5)

3/10 of an inch (7.6millimeters)

Introduction

Now you can take advantage of traditional McIntosh standards of excellence in the MA352 Integrated Amplifier. The Power Amplifier Solid State section of the MA352, with a power output of 200 watts per channel at 8 ohms, will drive a pair of quality Loudspeakers to a high level of performance.

The flexible Tube Preamplifier section provides

connections for various analog input sources.

The MA352 reproduction is sonically transparent and absolutely accurate. The McIntosh Sound is “The Sound of the Music Itself.”

Performance Features

• Power Output

The MA352 consists of 200 watts (8 ohm) or 320 watts (4 ohm) per channel Stereo Power Amplifier with less than 0.03% distortion. The McIntosh MA352 is designed for connection of a single 8 ohm or 4 ohm Loudspeaker per channel. The Power Amplifier uses Ther malTrak1 Output Transistors for lower distortion and cool operation.

• Power Guard

The patented McIntosh Power Guard circuit prevents amplifier clipping and protects your valuable Loudspeakers.

• Sentry Monitor and Thermal Protection

McIntosh Sentry Monitor power output stage protection circuits ensure the MA352 will have a long and trouble free operating life. Built-in Thermal Protection Circuits guard against overheating.

ThermalTrak™ and ON Semiconductor are trademarks of Semi-

conductor Components Industries, LLC

• Electronic Input and Output Switching

The Preamplifier uses Logic Controlled Electromagnetic Switches on all low level inputs and outputs. The operating functions are for reliable, noiseless, distortion free switching.

• Moving Magnet Phono Inputs

The MA352 Moving Magnet Input Circuitry uses the latest design to provide the lowest possible noise, distortion and flat frequency response.

• Equalizer Controls

The five Front Panel Equalizer Controls provide 12dB of boost or cut at their center frequencies. The MA352 remembers the Equalizer Circuitry Setting (On or Off) for each input.

• Multifunction Display

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

• Power Control Output

A Power Control connection for convenient Turn-On of a McIntosh Component.

• Remote Control

The Data Port together with the supplied Remote Control provide control of McIntosh Source Components connected to the MA352.

• Special Power Supply

The large Power Transformer, multiple filter capacitors with 60 Joules of Energy Storage and regulated Power Supply ensure stable noise free operation even though the power line varies.

Introduction and Performance Features

• McIntosh Custom Binding Posts

McIntosh Patented gold plated output terminals deliver high current output. They accept large diameter wire and spade lugs. Banana plugs may also be used only in the United States and Canada.

• Super Mirror Finish Chassis with Glass Panel

The famous McIntosh Stainless Steel Chassis with Super Mirror Finish ensures the pristine beauty of the MA352 will be retained for many years. The famous McIntosh Illuminated Glass Panel uses long life Light Emitting Diodes (LEDs).

Dimensions

The following dimensions can assist in determining the best location for your MA352. There is additional information on the next page pertaining to installing the MA352 into cabinets.

Front View of the MA352

Dimensions

Right Side View of the MA352

17-1/2"

44.5cm

BAL 1 15%

125

2K 10K

500

Rear View of the MA352

12-7/16"

31.6cm

13-1/4

33.7CM

8-7/8"

22.5cm

5-3/4"

14.6cm

7.62cm

9-7/8"

25.1m

1-1/2"

3.8cm

1-1/2"

3.8cm

9-1/4"

23.5

15.2CM

13-3/8"

33.9

Top View of the MA352

17-7/16

44.3CM

16-3/4"

42.5

V3 - 12AT7

PUSH - TRIM

V1 - 12AX7A

INPUT

HEADPHONES

30 125 500 2k 10k

V2 - 12AX7A

V4 - 12AT7

VOLUME

STANDBY

PUSH - POWER

Installation

The MA352 Integrated Amplifier 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 MA352. Cool operation ensures the longest possible operating life for any electronic instrument. Do not install the MA352 directly above a heat generating device, such as a Power Amplifier. Allow at least 6 inches (15.3cm) above the top, 5/8 inch (1.6cm) below the bottom and 2 inches (5.1cm) on each side of the Amplifier, so that airf low is not obstructed. Allow 22 inches (55.9cm) of depth for airf low and cable connections.

MA352 Front View

5.1cm

15.3cm

BAL 1 15%

125

Installation

5.1cm

2K 10K

500

MA352 Side View

15.3cm

22"

55.9cm

MA352 Rear Panel Connections

Main Fuse holder, refer to information on the back panel of your MA352 to determine the correct fuse size and rating

Right OUTPUT connections for a 4 or 8 ohm Loudspeaker

POWER CONTROL TRIG OUTPUT sends turn On/Off signals to a McIntosh Component when the MA352 is switched On/Off

OUTPUT 2 SUB unbalanced send signals to Power Amplifier(s) and is switched On/ Off with the Remote Control Push-Button

Left OUTPUT connections for a 4 or 8 ohm Loudspeaker

Connect the MA352 power cord to a live AC outlet. Refer to information on the back panel of your MA352 to determine the correct voltage for your unit

RS232 connector for connection to a compatible control system

IR INput for signals from a compatible IR Room Sensor

DATA PORTS are assignable to send signals to Source Components to allow control with the MA352 Remote Control

UNBALANCED INPUTS 1, 2 and 3 accept high level program source signals

PASSTHRU INput Power Control Input receives turn On/ Off signals from an Audio/Video Control Center

MM PHONO INPUT accepts signals from a Moving Magnet Phono Cartridge

GND terminal accepts a ground wire from a turntable

BALANCED INPUTS 1 and 2 accept high level program source signals

Connecting Components

The MA352 has the ability to automatically switch power On/Off to McIntosh Source Components via the Power Control connections. The Data Port Connections allow for the remote operation of basic functions using the MA352 Remote Control.

The connection instructions below, together with

the MA352 Input and Output Connection Diagrams located on the separate folded sheets “Mc2A/2B” and “Mc3A”, are examples of typical audio systems. 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 6.

Power Control Connections:

1. Connect a Control Cable from the MA352 POWER CONTROL OUTPUT Jack to the Power Control In on the Turntable.

2. Connect a Control Cable from the Turntable Power Control Out Jack to the Media Bridge Power Control In Jack.

3. Connect a Control Cable from the Media Bridge Power Control Out Jack to the AM/FM Tuner Power Control In Jack.

4. Connect a Control Cable from the AM/FM Tuner Power Control Out Jack to the SACD/CD Player Power Control In Jack.

5. Optionally, connect the SACD/CD Player Power Control out Jack to the Secondary Power Amplifier PWR CTRL.

6. Optionally, connect the A/V Processer Zone A Power Control to the MA352 PASSTHRU POWER CONTROL input Jack.

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

Data Control Connections:

8. Connect a Control Cable from the MA352 DATA PORTS 1 Jack to the SACD/CD Player Data In Jack.

9. Connect a Control Cable from the MA352 DATA PORTS 2 Jack to the AM/FM Tuner Data In Jack.

Audio Connections:

10. Connect XLR Balanced Cables from the MA352 BALanced INPUT 1 Connectors to the Media Bridge Audio Output Balanced Connectors.

11. Connect the Audio Cables from the AM/FM Tuner UNBAL Connectors to the MA352 UNBALANCED 1 Connectors.

12. Connect the Audio Cables from the SACD/CD Player UNBAL Connectors to the MA352 UNBALANCED 2 Connectors.

13. Connect the Audio Cables from the Turntable PHONO OUT Jacks to the MA352 MM PHONO Connectors.

14. Connect any additional Components in a similar

manner, as outlined in steps 7 thru 12.

15. Optionally, connect the A/V Processer Left Front

and Right Front XLR Connectors to the MA352 2L and 2R Balanced XLR Connectors.

Ground Connections:

16. Connect the Ground Cable coming from the Turntable to the MA352 GND Binding Post.

Output Terminals

When connecting the Loudspeaker Hookup Cables to the MA352 Amplifier 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

Opening

Figu re B

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

Figu re C Figu re D

Wrench over the top of the Output Terminal and rotate it one quarter of a turn (90°) to secure the Loudspeaker Cable Connection. Do not over tighten. Refer

Figu re E

to gure E.

How to Connect Loudspeakers

Caution: Do not connect the AC Power Cord to the

MA352 Rear Panel until after the Loudspeaker Connections are made. Failure to observe this could result in Electric Shock.

The MA352 Connection Instructions, located on the next page together with the Separate Diagram Sheets, are for 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 6.

Connecting Loudspeakers

Caution: Do not connect the AC Power Cord to the

MA352 Rear Panel until after the Loudspeaker Connections are made. Failure to observe this could result in Electric Shock.

The McIntosh MA352 Power Amplifier Circuitry is designed for Loudspeakers with an impedance of 8 Ohms or 4 Ohms. Connect a single Loudspeaker only to the Right and Left Output Terminals.

When connecting Loudspeakers to the MA352 it is very important to use cables of adequate size, so there is little to no power loss in the cables. The size is specified in Gauge Numbers or AWG (American Wire Gauge). The smaller the Gauge number, the larger the wire size:

Loudspeaker Cable Distance vs Wire Gauge Guide

Loudspeaker

Impedance

4 Ohms

8 Ohms

25 feet

(7.62 meters)

or less

14AWG 12AWG 10AWG

16AWG 14AWG 12 AWG

50 feet

(15.24 m eters)

or less

100 fe et

(30. 48 m ete rs)

or less

1. Prepare the Loudspeaker Hookup Cable for attachment to the MA352 Power Amplifier:

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.

Figure F

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.

Figure G

Figure H

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.

3. Rotate the Output Terminal Post

clockwise until it is nger tight. Refer to gure J. Then using the Mc-

Figure I

Intosh Wrench, rotate the top of the Output Terminal one quarter of a turn (90°). Do not over tighten.

4. Referring to figure K, con-

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

Figure J

terminal to the MA352 Negative Output Terminal and Positive Output Terminal to the Loudspeaker Terminal Connections being careful to observe the correct polarities.

Note: The illustration

located on the separate folded sheet “Mc2B” is

for connection to an 8Ω (ohms) Loudspeaker.

Figure K

If the Loudspeaker’s impedance is in-between the available connections, use the nearest lower impedance connection. Refer to “General Information” Note 6 on page 6 for additional information.

WARNING: Loudspeaker terminals are hazard-

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

5. Connect the MA352 power cord to an active AC outlet.

Spade Lug or Wire Connections:

6. Connect the Loudspeaker hookup cables to the MA352 Negative Output Terminal and Positive Output Terminal to the Loudspeaker Terminal Connections being careful to observe the correct polarities. 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.

Figure L

Note: The illustration located on the separate folded

sheet “Mc2B” is for connection to an 8Ω (ohms) Loudspeaker.

Figure M

Refer to “General Information” Note 6 on page 6 for additional information.

WARNING: Loudspeaker terminals are hazard-

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

7. Connect the MA352 power cord to an active AC outlet.

MA352 Switch Power On

Tube Warmup

Press the Volume Control on the MA352 or press the (Power ON) Push-button on the Remote Con-

trol to switch On the MA352. The MA352 will go through a TUBE WARMUP cycle (15 seconds), with the Audio Muted. The Tubes in the MA352 glow an orange color and a brief startup initialization with the Front Panel Information Display indicating “MA352, TUBE WARMUP”. Refer to figure B.

MA352

Figu re B

When the tube warm up procedure has completed.

The illumination of the Tubes will now glow a green color; this is followed by the last Input Source listened to and the volume setting indication starting at zero and then increasing to the last used volume setting. Refer to figure C.

Switch Power On to the MA352 Tube Intergrated Amplifer

Preamplifier Small Signal Vac u u m Tu be

LED Illumination Color: Orange - Warmup Mode and Power Guard Green - Normal Operation

Figu re C

BAL 1 15%

125

Figu re A

500

2K 10K

HR085 Remote Control Push-Buttons

LEDs illuminate during the time a remote command is sent and when programming the remote control

Select the DEVICE to issue a remote control command to

SETUP Push-button is used as a “Shift Key” to select a function with blue color nomenclature

Selects AM Tuner Operating Functions, select Output 1 when used with the SETUP/shift Push-button and Track Selection on certain McIntosh CD Players

Press the Trim Push-button and then the LEVEL UP Push-button to select and adjust various functions. MENU is used with McIntosh Models displaying choices on a video screen

Activates the TRIM Mode. GUIDE is used with McIntosh Models displaying instructions on a video screen

Press the Trim Push-button and then the LEVEL DOWN Push-button to select and adjust various functions. INFO is used with McIntosh Models displaying information on a video screen

Scrolls through the available INPUTS

Mutes the audio

Press to Power the Preamplifier ON

Use to select tuner presets, direct access an AM/FM Station Frequency, disc tracks or any numbered operation

Press to Power the Preamplifier OFF

Direct access to stored Tuner PRESETS when used with the numeric Push-buttons (0 thru 9)

Selects FM Tuner Operating Functions, select Output 2 when used with the SETUP/shift Push-button and Track Selection on certain McIntosh CD Players

Use p and q to tune Up or Down the AM/FM Dial, use u and t for the next or previous HD Radio Program (where applicable)

EXIT the TRIM Menu and is used with McIntosh Models displaying information or choices on a video screen

Used to SELECT/Enter the indicated choice

Press to change broadcast BANDs on a connected Tuner. Select certain functions on a variety of McIntosh Models

Adjusts the VOLume level up or down

Selects transport functions of STOP, PLAY/PAUSE, RECORD, BACK for the previous-selection, FAST-REVERSE, FAST-FORWARD and NEXT for the next selection

Selects Previous Tuner Station PRESET

Tuner scans Down the dial to SEEK the next Station

Selects Next Tuner Station PRESET

Tuner scans Up the dial to SEEK the next Station

Note: Push-buttons whose function is not identified

above are for use with other McIntosh Products.

How to use the Remote Control

The supplied MA352 Remote Control (HR085) is capable of directly controlling the functions of contemporary McIntosh Source Components connected to the MA352 via the Data Ports.

Notes: 1. If at any time the MA352 seems unresponsive

to the HR085 Remote Control Commands, press the DEVICE Push-button to select

first.

2. For additional information on using the HR085 Remote Control with the McIntosh Model, please refer to the “How to Operate” starting on page 22.

3. For additional information on assigning the Data Ports, refer to “How to Setup” on page

17.

Trim

Press the TRIM Push-button until the desired Trim function (Balance, Trim Level, etc.) appears on the MA352 Front Panel Display, then press the LEVEL Up or Down Push-button to adjust the Trim setting.

Note: Press the TRIM Push-button to recall the last Trim

function selected. For additional information on using the Trim Functions refer to “How to Operate” pages 22-25.

How to use the Remote Control

Front Panel Displays, Controls and Jack

Preamplifier Small Signal Vac u u m Tu be

LED Illumination Color: Orange - Warmup Mode and

- Power Guard Activates G reen - Normal Operation

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

Meter indicates the Left Channel Output of the amplifier

IR Sensor receives commands from a Remote Control

BAL 1 15%

125

500

Preamplifier Small Signal Vac u u m Tu be

Meter indicates the Right Channel Output of the amplifier

2K 10K

INPUT Control used to select a source for listening and recording. The control is also used to enter the TRIM or SETUP Modes and select the various functions

EQUALIZER Controls increase or decrease the volume levels at the Center Frequencies of 30Hz, 125Hz, 500Hz, 2,000Hz, and 10,000Hz

Connection for low impedance dynamic HEADPHONES, for private listening

VOLUME Control allows adjustment of the listening level for both channels. Switches the MA352 ON or OFF (Standby). Also used to change the various TRIM and SETUP Functions

and Resets the microprocessors STANDBY LED Indicator

How to Operate the Setup Mode

SETUP: Inputs

SETUP: UNBAL 3

Setup

Your McIntosh MA352 has been factory configured to 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 Information Display. Refer to the MA352 Front Panel Illustration on the previous page while performing the following steps.

Note: If the MA352 is currently On, proceed to step 2.

1. Press the Volume Control on the MA352 or press the (Power ON) Push-button on the Remote Control to switch On the MA352. Refer to page 9 for information about Switching Power On to the MA352. After the MA352 goes through its startup, the Front Panel Information Display indicates the last used source 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.

UNBAL 1 15%

Figu re 1

2. Press and hold in the INPUT Control until

the Front Panel Information Display indicates “MA352 V1.00, (or higher Firmware version)

- S/N: AHN_ ___” (Serial Number). Refer to

figure 2.

Figu re 2

3. Rotate the INPUT Control to select the Setup

Mode Menu item, “SETUP: Inputs, (Hold INPUT)”. Refer to figure 3.

(Hold INPUT)

Figu re 3

Continue to rotate the INPUT CONTROL to view the other SETUP Mode Options.

4. To exit from the SETUP Mode, press and hold in the INPUT Control and the Front Panel Display will indicate 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.

MA 352 V1.00 13

INPU TS On/Of f / Rename 13-15

OUTPUT 2 Stere o / Mono 15

PAS STH RU Various Inputs 16

DATA PO RTS (1 and 2)

RS232 Comm Port Bau d Rate 17

IR Code s Normal

Front IR Se nsor Enabled 19

Auto- Of f Enabled 19

Factory Reset Default Settings 20

All Dat a and

Various Inputs

Firmware Version

The MA352 functionality is controlled by internal software that is know as Firmware. The Version of the Firmware in the MA352 can be identified at any time by utilizing the Setup Mode.

1. Press and hold in the INPUT Control to enter Setup Mode.

2. Referring to the Front Panel Information Displaythe number after the character “V” is the Firmware number. Refer to figure 2.

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

Input Settings

The MA352 provides the ability to switch unused INPUTS Off (or back On if they have been previously switched Off). The default INPUT Names can be changed to match the name of the component connected to it or any other custom name desired (within 10 Characters). INPUT SWITCHED ON/OFF: In the following example, the UNBAL 3 Input will be switched Off.

Note: When an INPUT is swiched Off, its name will

no longer appear on the Front Panel Information Display when using the INPUT Control (Front Panel or Remote Control).

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3.

2. Rotate the INPUT Control until “SETUP: Inputs, (Hold INPUT)” appears on the Information Display. Refer to figure 3.

3. Press and hold in the INPUT Control until “SETUP: UNBAL 3, On / Name (Hold IN)” appears on the Display. If necessary rotate the INPUT Control to select the UNBAL 3 Input. Refer to figure 4.

SETUP: UNBAL 3 On/Name(Hold IN)

Figu re 4

4. To switch the UNBAL 3 Input Off, rotate the VOLUME Control until the display indicates “SETUP: UNBAL 3, Off”. Refer to figure 5.

Off

Figu re 5

Input Settings, con’t

>CAL

RENAME: BAL >CD

>CDL

SETUP: Inputs

>BAL

RENAME: BAL

SETUP: CD PLAYER

>CD PLAY

>CD PLAYE

RENAME: BAL

>CD PLAYER

5. Exit the SETUP Mode by several presses of the INPUT Control.

R E NA ME I NP U T: In the following example, the BALANCED 1 (BAL

1) Input will be renamed to match up with the component connected (refer to page 11, step 9). The MA352 Default Input Names (UNBAL 1, BAL 1, COAX 1, etc.) as indicated on the Front Panel Display can be customized to a different name up to ten characters long (TUNER, CD PLAYER, 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 . In the following example, the BAL 1 Input will be renamed to “MEDIA BRDG”.

6. Press and hold in the INPUT Control to enter the

SETUP MODE. Refer to figure 3, on page 17.

7. Rotate the INPUT Control until “SETUP: Inputs,

(Hold INPUT)” appears on the Information Display. Refer to figure 6.

(Hold INPUT)

Figu re 6

8. Press and hold in the INPUT Control until “SET-

UP: BAL 1, On/Name (Hold INPUT)” appears on the Display. If necessary rotate the INPUT Control to select the BAL 1 Input. Refer to figure 7.

SETUP: BAL On/Name(Hold IN)

Figu re 7

9. Press and hold in the INPUT Control until “RE-

NAME: BAL” appears on the Display. The character “B” is flashing to indicate it is ready to be changed. Refer to figure 8.

RENAME: BAL

Figu re 8

10. Rotate the VOLUME (ADJUST) Control to change the character “B” to “M”. Refer to figure 9.

RENAME: BAL

Figu re 9

11. Rotate the INPUT Control until the character “A” is flashing, then rotate the VOLUME (ADJUST) Control to change the character “A” to “E”. Refer to figure 10.

RENAME: BAL

Fig u r e 10

12. Rotate the INPUT Control until the character “L” is flashing, then rotate the VOLUME (ADJUST) Control to change the character “L” to “D”. Refer to figure 11.

Fi g u re 11

13. Rotate the INPUT Control until the “_” empty space to the right of character D is flashing, then rotate the VOLUME (ADJUST) Control to change the “_” empty space to character to “I”. Refer to figures 12 and 13.

>CD P

Figu re 12

Figure 13

14. Repeat steps 8 thru 13 until the new name of “RENAME: BAL 1, MEDIA BRDG” is indicated on the Front Panel Display. Refer to figures 14 thru

17.

>CD PLA

Figure 14

RENAME: BAL

Fig ure 15

RENAME: BAL

Figure 16

RENAME: BAL

Fig u r e 17

15. To save the new name, press and hold in the INPUT Control until “SETUP: MEDIA BRDG , ON / Rename” appears on the Front Panel Information Display. Refer to figure 18.

On/Name(Hold IN)

Figure 18

16. Exit the SETUP Mode by several presses of the INPUT Control.

Note: For convenience, an “Input Assignment Chart”

on a separate sheet “Mc5A/5B” has been provided to keep track of changes.

OUTPUT 2

SETUP: Output 2

SETUP: Passthru

SETUP: Data Ports

SETUP: Data Port 2

The OUTPUT 2 Rear Panel Unbalanced Connectors are adjustable for their mode of operation:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: Output 2, Stereo” appears on the Information Display. Refer to figure 19.

Stereo

Figure 19

3. Rotate the VOLUME (ADJUST) Control to change from the “Stereo” mode setting to the “Mono” mode of operation. Refer to figure 20.

Mono

Figu re 20

Passthru

When the MA352 is part of a Home Theater or Multichannel Audio System, the Connections from the Audio/Video Processor or Surround Decoder can switch On the MA352 and provide two audio channels, refer to page 11. The Setup Mode allows selection of the specified MA352 Input to be used for the Right and Left Front Channels. In the example below, the Right and Left Front Channels from the Audio/Video Processsor will be connected to the BALanced 2 Input Connectors on the MA352. Refer to pages 11 and 12 for additional connection information.

Note: The Phono Input is not assignable as a Passth-

ru Input.

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: Passthru, OFF” appears on the Information Display. Refer to figure 21.

OFF

Fig ure 21

3. Rotate the VOLUME (ADJUST) Control to select “BAL 2” Input. Refer to figure 22.

BAL 2

Figu re 22

4. Exit the SETUP Mode by several presses of the

INPUT Control.

Data Port

Data Port Connection between the MA352 and a McIntosh Source Component allows for basic function control of the source component using the MA352 Remote Control. By default, the Data Port setting of “All Data” sends the received IR Data to the DATA PORT Output Jack. To dedicate the Data Port for only one MA352 source component perform the following Steps:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: Data Ports, (Hold INPUT)” appears on the Information Display. Refer to figure 23.

(Hold INPUT)

Figu re 23

3. Press and hold in the INPUT Control and the following display will appear “SETUP: Data Port 1, All Data”. Refer to figure 24.

Setup, con’t

SETUP: Data Port 1 All Data

Figu re 24

4. Rotate the VOLUME (ADJUST) Control to select the BAL 1 Input for Data Port 1. Refer Figure 25 “SETUP: Data Port 1, BAL 1”.

SETUP: Data Port 1 BAL 1

Figu re 25

5. The MA352 has a second Data Port that another Source Input can be connected for remote control.

6. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

7. Rotate the INPUT Control until “SETUP: Data Ports, (Hold INPUT)” appears on the Information Display. Refer to figure 23.

8. Press and hold in the INPUT Control and the following display will appear “SETUP: Data Port 1, All Data”. Refer to figure 24.

9. Rotate the INPUT Control until the Front Panel Display now indicates “SETUP: Data Port 2, All Data”. Refer to figure 26.

All Data

Figu re 26

10. Rotate the VOLUME (ADJUST) Control to select the UNBAL 2 Input for Data Port 2. Refer Figure 27 “SETUP: Data Port 2, UNBAL 2”.

UNBAL 2

Figu re 27

11. Exit the SETUP Mode by several presses of the INPUT Control.

SETUP: RS232

SETUP: Front IR

SETUP: IR Codes

Comm Port Baud Rate

Remote Control Codes

IR Sensor

The MA352 may be remotely controlled from a compatible control system connected to the Rear Panel RS232 Jack. The speed at which the MA352 communicates (8 bit, no parity and 1 stop bit) with other equipment is adjustable from 9,600 bits per second to 115,200 bits per second. To change from the default speed of 115,200 bits per second, perform the following steps:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: RS232, 115200 Baud” appears on the Information Dis-

115200 Baud

Figu re 28

play. Refer to figure 28.

3. Rotate the VOLUME (ADJUST) Control to select the desired Baud Rate Speed.

4. Exit the SETUP Mode by several presses of the INPUT Control.

The Remote Control included with the MA352 utilizes the NORMAL McIntosh Control Codes. The Second Set of Control Codes the MA352 will respond to is referred to as the ALTERNATE Codes. The Alternate Codes are used when the MA352 is used in the same location as another McIntosh Preamplifier and/or A/V Processor. This will prevent the Remote Control from affecting the operation of both units at the same time. To activate the Remote Control ALTERNATE Codes perform the following steps:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: IR Codes, Normal” appears on the Information Display. Refer to figure 29.

Normal

Figu re 29

3. Rotate the VOLUME (ADJUST) Control to the Alternate Codes. Refer to figure 30.

The MA352 Front Panel Sensor, which receives the signals from the HR085 Remote Control, can be switched off to prevent interference when an external IR Sensor is connected. To de-activate the Front Panel IR Sensor perform the following steps:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: Front IR, Enabled” appears on the Information Display. Refer to figure 31.

Enabled

Fig u r e 31

3. Rotate the VOLUME (ADJUST) Control to select “Disabled”. Refer to figure 32.

Disabled

Figure 32

4. Exit the SETUP Mode by several presses of the INPUT Control.

Figu re 30

4. It is now necessary to change the HR085 Remote Control over to the Alternate Codes. Information on the HR085 Remote Control is available for download from the McIntosh Web Site:

http://www.mcintoshlabs.com/us/Products/pages/ ProductDetails.aspx?CatId=preamplifiers&Produ ct Id=MA352

5. Exit the SETUP Mode by several presses of the INPUT Control.

Setup, con’t

FACTORY RESET

Power Mode

The MA352 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 user activity (includes changes to any of the Operation Functions such as source selection, volume adjustment, etc.) or absence of an audio signal. If it is desirable to disable the Auto Off Feature perform the following steps:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “SETUP: Auto Off, Enabled” appears on the Information Display. Refer to figure 33.

Figure 33

3. Rotate the VOLUME (ADJUST) Control to select Disabled. Refer to figure 34.

Factory Reset

If it becomes desirable to reset all the adjustable settings (Setup and Trim Settings) to the factory default values, perform the following steps:

1. Press and hold in the INPUT Control to enter the SETUP MODE. Refer to figure 3 on page 17.

2. Rotate the INPUT Control until “FACTORY RESET, (Hold INPUT)” appears on the Information Display. Refer to figure 35.

(Hold INPUT)

Figure 35

3. Press and hold in the INPUT Control until “FACTORY RESET, In Progress!” appears on the Information Display, then release the INPUT Control. Refer to figures 36 and 37.

In Progress

Figu re 36

Figure 34

4. Press the INPUT Control to exit the Setup Mode.

Completed!

Figure 37

4. Press the Front Panel STAND/BY Push-button to switch On the MA352.

How to Operate the MA352

Power On and Off

The Red LED to the left of the VOLUME Control lights to indicate the MA352 is in Standby mode. To switch ON the MA352, Press the VOLUME Control on the Front Panel or press the Push-button on the Remote Control. Refer to page 13 for information about Switching Power On to the MA352. This is followed by the Front Panel Display indicating the last used source and 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 MA352, press the VOLUME Control on the Front Panel or press the Power Push-button on the Remote Control.

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 source

or push the INPUT Push-button on the Remote Control to select the Phono Input. Refer to figures 51 and

52.

Fig ure 51

MM PHONO 15% 50pF

Figure 52

Volume Control

Rotate the Front Panel VOLUME Control or use the or Push-buttons on the Remote Control for the desired listening level. Refer to figures 50 and 53.

Trim Functions

The MA352 has a variety of different Trim Selections

with Adjustments. The Trim Selections include Balance, Input Trim Level, Equalizer Mode, Mono/ Stereo Mode, Amplifier Meter Lights, Display Brightness, and when Headphones are connected, HXD Mode. The Trim Settings are stored in memory independently for each Input Source Selected, except the Meter Illumination and Display Brightness settings of On or Off, which are the same for all inputs.

Note: Selection and Adjustment of

all Trim Functions may be performed by pressing the Front Panel INPUT Trim Control and then rotating it to select the desired Trim Function. Then use the VOLUME Adjust Control to change the setting. Remote Control TRIM Push-Button together with the LEVEL UP / LEVEL DN Push-button may also be used. Refer to figure 53.

BAL 1 15%

125

Figure 50

BALANCE Listening balance varies with different program sources, room acoustics and listening positions relative to the Loudspeakers. Use

2K 10K

500

the Balance (Trim Function) as

Figure 53

needed to achieve approximately equal listening volume levels in each Loudspeaker. To adjust the Balance perform the following:

1. Press the TRIM Push-button repeatedly on the Remote Control until “L BALANCE R, || ” appears on the Front Panel Display. Refer to figure 54.

How to Operate the MA352

L BALANCE R

MONO / STEREO

______

Figu re 54

Note: The Front Panel INPUT Control may also be

used.

2. Press the LEVEL UP / DOWN Push-buttons on the Remote Control to emphasize the Right Channel (refer to figure 55) or the Left Channel (refer to figure 56).

Fig ure 55

¦¦¦

¦¦¦¦¦

The Front Panel Display indicates the Balance changes are from 0 to 50 dB. After approximately 4 seconds the Information Display returns to indicate the Source Selection and Volume Level. To verify the Balance setting without changing it, use the TRIM Push-button and select Balance.

EQUALIZER MODE Press the TRIM push-button or the INPUT Front Panel Control to select EQUALIZER function as it is indicated on the Front Panel Information Display. The built-in four band Frequency Equalizer provides more precise adjustment of sound than standard Bass and Treble Controls. By default, the Equalizer is Off for all Input Sources and the Equalizer Circuitry is bypassed. Any Input Source may be assigned to have the Equalizer On when selected. To activate the Equalizer for a given Input Source, select the desired Input Source, perform the following steps:

Figu re 56

Note: The audio signal present at the FIXED OUT

Jacks is unaffected by the Equalizer settings.

1. Select the desired Input Source.

2. Select “EQUALIZER, Off” as indicated on the Front Panel Information Display. Refer to f i g ure 57.

Figure 57

3. Set the EQUALIZER On for the desired Input by using the Front Panel Volume Control or the Remote Control Push-buttons. Refer to figure 58.

Figu re 58

Refer to graph on page 26 for additional information on using the MA352 Equalizer. After approximately 5 seconds the Information Display returns to indicate the Source Selection and Volume Level.

MONO/STEREO MODE Press the TRIM push-button or the INPUT Front Panel Control to select MODE function as it is indicated on the Front Panel Information Display. By default the Stereo Mode is active for all Input Sources however, any Input Source may be assigned to the Mono Mode of operation. To change Stereo Mode to Mono for a given Input Source, perform the same type of steps by using the Front Panel Controls or the Remote Control Pushbuttons as done for Treble and/or Bass Settings:

Note: The audio signal present at the FIXED OUT

Jacks is affected by the Stereo/Mono setting.

1. Select the desired Input Source.

2. Select “MONO / STEREO, indicated on the Front Panel Information Display.

______

” as

Refer to figure 59.

Figure 59

3. To select MONO Mode adjust the TRIM LEVEL. Refer to figure 60.

____

After approximately 6 seconds the Information Display returns to indicate the Source Selection and Volume Level.

OUTPUT 1 AND 2 Press the TRIM push-button or the INPUT Front Panel Control to select the OUTPUT 1 or OUTPUT 2 function as they are indicated on the Front Panel Information Display. The Output 1 setting is for loudspeakers connected to the Power Amplifier Circuitry of the MA352. The Output 2 Setting is for an external Power Amplifier connected to the MA352 Rear Panel Preamplifier Circuitry Output Jacks. Select the appropriate Setting for the Output 1 and Output 2 settings, either On or Off. Refer to figures 61, 62, 63 and 64 on this and the next page.

Figure 60

Output 1 On

Figure 61

Output 1 Off

Figu re 62

How to Operate the MA352, con’t

Output 2

INPUT TRIM

METER LIGHTS

Figu re 63

Off

Figu re 64

TRIM LEVEL Source Components can have slightly different volume levels resulting in the need to readjust the MA352 Volume Control when switching between different sources. The MA352 allows the adjustment of levels for each of the Source Inputs for the same relative volume. To adjust the Trim Level for the currently selected Input Source perform the following steps:

1. Select “INPUT TRIM, 0.0dB” as indicated on the Front Panel Information Display. Refer to figure

65.

0.0 dB

Figu re 65

2. Adjust the Trim Level of each Input to match the average volume level of the Input most frequently listened to. The range of adjustment is ± 6.0dB in half dB steps. Refer to figures 66 and 67.

+4.0 dB

Figu re 66

-2.5 dB

Figu re 67

After approximately 6 seconds the Information Display returns to indicate the Source Selection and Volume Level.

METER ILLUMINATION The Meter Illumination of the McIntosh MA352 may be switched On or Off by performing the same type of operational steps as MONO/STEREO MODE on page 23:

1. Select “METER LIGHTS, On” as indicated on the Front Panel Information Display. Refer to figure

68.

Figu re 68

2. Switch Off the Meter Illumination by using the Front Panel Controls or Remote Control Pushbuttons. Refer to figure 69.

Off

Figu re 69

After approximately 6 seconds the Information Display returns to indicate the Source Selection and Volume Level.

BAL 1 15%

125

Figure 50

TUBE LIGHTS The MA352 Vacuum Tubes Green Color Illumination may be switched On or Off by performing the same type of operational as Meter Illumination Lights ON or OFF above:

1. Select “TUBE LIGHTS, On” as indicated on the Front Panel Information Display. Refer to figure

2K 10K

500

70.

Figu re 70

How to Operate the MA352, con’t

BRIGHTNESS

Reset of the Microprocesors

2. Switch Off the TUBE Illumination by using the Front Panel Controls or Remote Control Pushbuttons. Refer to figure 71.

Figure 71

After approximately 6 seconds the Information Display returns to indicate the Tube Normal Color or Green.

INFORMATION DISPLAY ILLUMINATION The Brightness Level of MA352 Front Panel Information Display can be adjusted from bright to dim by performing the same type of operational steps for adjusting the METER ILLUMINATION:

1. Select “DISPLAY, BRIGHTNESS” as indicated on the Front Panel Information Display. Refer to figure 72.

DISPLAY

Figu re 72

2. Reduce the Brightness level by adjusting the TRIM LEVEL. Refer to figure 73.

INFORMATION DISPLAY ACTIVITY The Activity of MA352 Front Panel Information Display can be set to be always ON or OFF by performing the same type of operational steps for adjusting the DISPLAY ILLUMINATION:

1. Select “DISPLAY, Always On” as indicated on the Front Panel Information Display. Refer to figure 74.

Fig u re 74

2. Switch the Front Panel Information Display OFF by adjusting the TRIM LEVEL. Refer to figure 75.

Fig u re 75

After approximately 6 seconds the Information Display returns to indicate the DISPLAY ON.

In the unlikely event the controls of the MA352 stop functioning, the microprocessors can be reset by performing the following:

1. Press and hold in the Front Panel VOLUME CONTROL until the STANDBY/ON LED Indicator switches Off.

2. Then release the VOLUME CONTROL and the MA352 will switch Off.

3. When the STANDBY/ON LED is illuminated press the VOLUME CONTROL and the MA352 will resume normal operation.

DISPLAY

Figu re 73

After approximately 6 seconds the Information Display returns to indicate the Source Selection and Volume Level.

Specifications

Amplifier Specifications

Power Output Stereo

Minimum sine wave continuous average power output per channel, with both channels operating is: 200 watts into 8 ohm load 320 watts into 4 ohm load

Output Load Impedance

8 or 4 ohms

Rated Power Band

20Hz to 20,000Hz

Total Harmonic Distortion

0.03% maximum with both channels operating from 250 milliwatts to rated power, 20Hz to 20,000Hz

Intermodulation Distortion

0.03% maximum, if the instantaneous peak power output does not exceed twice the rated power output for any combination of frequencies from 20Hz to 20,000Hz

Dynamic Headroom

1.5dB

Wide Band Damping Factor

Greater than 200 - 8 ohm, Greater than 100 - 4 ohm

Power Guard

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

Frequency Response

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

Preamplifier Output Impedance

500 ohms

Sensitivity (for rated output)

High Level - 250mV unbalanced, 500mV balanced Phono - 2.5mV

Signal To Noise Ratio (A-Weighted)

High Level - 93dB below rated output Phono - 82dB below 5mV input

Input Impedance

High Level - 20K ohms Phono - 47K ohms; 50pF-800pF

Preamplifier Output 2 (for rated input)

1.4V unbalanced (8V Maximun)

Maximum Input Signal

High Level - 8V unbalanced, 16V balanced Phono - 80mV

Voltage Gain

High Level to Output 1: 44dB High Level to Output 2: 15dB Phono to Output 1: 84dB Phono to Output 2: 55dB

Headphone Impedance

100 to 600 ohms

Trigger Output

12VDC, 25mA

Equalizer Controls

+15

+10

A M P L

+ 5

T U D E

D E C

- 5

I B E L S

-10

-15

20 50 100 200 500 1k

FREQUENCY IN HERTZ

2k 5k 10k 20k

General Specifications

Power Requirements

Field AC Voltage conversion of the MA352 is not possible. The MA352 is factory configured for one of the following AC Voltages:

100 Volts, 50/60Hz at 7.2 amps 110 Volts, 50/60Hz at 6.0 amps 120 Volts, 50/60Hz at 6.0 amps 127 Volts, 50/60Hz at 6.0 amps 220 Volts, 50/60Hz at 3.3 amps 230 Volts, 50/60Hz at 3.3 amps 240 Volts, 50/60Hz at 3.3 amps Standby: Less than 0.5 watt

Note: Refer to the rear panel of the MA352 for the cor-

rect voltage.

Overall Dimensions

Width is 17-1/2 inches (44.5cm) Height is 9-7/8 inches (25.1cm) including feet Depth is 20-1/2 inches (52.1cm) including the Cables

Weight

66 pounds (29.9 kg) net, 75 pounds (34.0 kg) in shipping carton

Shipping Carton Dimensions

Width is 22-5/8 inches (57.5cm) Depth is 21-7/8 inches (55.6cm) Height is 12-7/8 inches (32.7cm)

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 feet are attached to the bottom of the equipment. This will ensure the proper equipment location on the bottom foam pad. Failure to do this will result in shipping damage.

To protect the tubes during shippment, the Foam Insert removed from the MA352 needs to be re-inserted. Follow the unpacking instructions on pages 4-5 in the reverse order.

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 2. Please see the Part List for the correct part numbers.

MA352 Packing Material List

Quantity Part Number Description

1 034614 Shipping carton 1 034615 Foam Top 1 034617 Foam Bottom

Warning Sheet

Foam Top

Foam Middle (4)

Foam Insert for

Tubes and Shields

Plastic Foot (4)

10/32 X 3/4” Screw With Washer (4)

Accessories

4 034616 Foam Middle 1 034613 Foam Insert (for protecting the Tubes during shipping) 1 241001 Warning Sheet

4 400159 10-32 x 3/4 inch screw 4 017937 Feet

Foam Bottom

Shipping Carton

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. 24100000

Mcintosh MA352 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual